SRM450 ACTIVE SOUND REINFORCEMENT SPEAKER USERS MANUAL

CAUTION

8. Heat This Mackie product should be situated away from heat sources such as radiators, or other devices which produce heat. 9. Power Sources This Mackie product should be connected to a power supply only of the type described in these operation instructions or as marked on this Mackie product. 10. Power Cord Protection Power supply cords should be routed so that they are not likely to be walked upon or pinched by items placed upon or against them, paying particular attention to cords at plugs, convenience receptacles, and the point where they exit this Mackie product. 11. Object and Liquid Entry Care should be taken so that objects do not fall into and liquids are not spilled into this Mackie product. 12. Damage Requiring Service This Mackie product should be serviced only by qualified service personnel when: A. The power-supply cord or the plug has been damaged; or B. Objects have fallen, or liquid has spilled into this Mackie product; or C. This Mackie product has been exposed to rain; or D. This Mackie product does not appear to operate normally or exhibits a marked change in performance; or E. This Mackie product has been dropped, or its chassis damaged. 13. Servicing The user should not attempt to service this Mackie product beyond those means described in this operating manual. All other servicing should be referred to the Mackie Service Department. 14. To prevent electric shock, do not use this polarized plug with an extension cord, receptacle or other outlet unless the blades can be fully inserted to prevent blade exposure.
RISK OF ELECTRIC SHOCK DO NOT OPEN RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE COVER (OR BACK) NO USER-SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED PERSONNEL
ATTENTION: POUR EVITER LES RISQUES DE CHOC ELECTRIQUE, NE PAS ENLEVER LE COUVERCLE. AUCUN ENTRETIEN DE PIECES INTERIEURES PAR L'USAGER. CONFIER L'ENTRETIEN AU PERSONNEL QUALIFIE. AVIS: POUR EVITER LES RISQUES D'INCENDIE OU D'ELECTROCUTION, N'EXPOSEZ PAS CET ARTICLE A LA PLUIE OU A L'HUMIDITE
The lightning flash with arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of uninsulated "dangerous voltage" within the product's enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. Le symbole clair avec point de flche l'intrieur d'un triangle quilatral est utilis pour alerter l'utilisateur de la prsence l'intrieur du coffret de "voltage dangereux" non isol d'ampleur suffisante pour constituer un risque d'lctrocution. The exclamation point within an equilateral triangle is intended to alert the user of the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance. Le point d'exclamation l'intrieur d'un triangle quilatral est employ pour alerter les utilisateurs de la prsence d'instructions importantes pour le fonctionnement et l'entretien (service) dans le livret d'instruction accompagnant l'appareil.

SAFETY INSTRUCTIONS

1. Read Instructions All the safety and operation instructions should be read before this Mackie product is operated. 2. Retain Instructions The safety and operating instructions should be kept for future reference. 3. Heed Warnings All warnings on this Mackie product and in these operating instructions should be followed. 4. Follow Instructions All operating and other instructions should be followed. 5. Water and Moisture This Mackie product should not be used near water for example, near a bathtub, washbowl, kitchen sink, laundry tub, in a wet basement, near a swimming pool, swamp or salivating St. Bernard dog, etc. 6. Cleaning Clean only with a dry cloth. 7. Ventilation This Mackie product should be situated so that its location or position does not interfere with its proper ventilation. For example, the Component should not be situated on a bed, sofa, rug, or similar surface that may block any ventilation openings, or placed in a built-in installation such as a bookcase or cabinet that may impede the flow of air through ventilation openings.
Pour prvenir les chocs lectriques ne pas utiliser cette fiche polarise avec un prolongateur, un prise de courant ou une autre sortie de courant, sauf si les lames peuvent tre insres fond sans laisser aucune pariie dcouvert.
15. Grounding or Polarization Precautions should be taken so that the grounding or polarization means of this Mackie product is not defeated. 16. Power Precaution Unplug this Mackie product during lightning storms or when unused for long periods of time. Note that this Mackie product is not completely disconnected from the AC mains when the power switch is in the OFF position. 17. This apparatus does not exceed the Class A/Class B (whichever is applicable) limits for radio noise emissions from digital apparatus as set out in the radio interference regulations of the Canadian Department of Communications.

PORTABLE CART WARNING

Carts and stands - The Component should be used only with a cart or stand that is recommended by the manufacturer. A Component and cart combination should be moved with care. Quick stops, excessive force, and uneven surfaces may cause the Component and cart combination to overturn.

FR Series Power Amplifiers
To power these beautiful things, each SRM450 includes two of our acclaimed FR Series Fast Recovery power amplifiers. Our exclusive design uses low negative feedback, yet allows the amplifiers to maintain low distortion and stability and to quickly recover when driven into clipping. The amplifiers include the following features: The low-frequency amplifier produces up to 540 watts peak (300 continuous) before clipping. The high-frequency amplifier produces up to 150 watts peak (100 continuous) before clipping. Each amplifier has its own compressor circuit that acts when the input signal is large enough to cause clipping, distortion and excessive voice coil heat. The compressor will automatically decrease the input signal to a safe level. The compressor in the low-frequency amp works independently from that in the high-frequency amp. The low-frequency amp uses a servo feedback loop which senses the current flowing in the woofer coil. This controls the low-frequency response and maintains low distortion at high output levels. The low-frequency amplifier also has a sweeping filter. This will automatically move the low cut-off frequency up or down depending on the amplifier output. For example, if the amplifier is below clipping, the low-frequency cutoff point is 55 Hz. As it approaches clipping, this shifts up smoothly to 120 Hz, providing more power reserves and less distortion before clipping. This happens quickly and continuously, protecting the amplifer and the woofer and reducing any noticable distortion. Warning: Although the amplifiers have these protection circuits, you must still make sure the PEAK light is not blinking continuously. If it is, turn down your mixer faders, or preamplifier gain, or turn down the SRM450 LEVEL control.

The Transducers

The SRM450 active speakers feature a 12-inch high-power low-frequency woofer and a 1.75-inch titanium diaphragm highoutput precision compression driver. This high-frequency driver is mounted on an acoustically non-resonant exponential waveguide, providing a wide, controlled dispersion and precise reproduction of the critical upper mid-range and high frequencies. The result is an unbelievably smooth off-axis response that allows everyone in the audience to experience the same highresolution audio no matter where they are seated. Each driver has been specifically designed by our engineers for optimum performance in the lightweight high-strength cabinet.

The Crossover

The built-in electronic crossover is a 24 dB/octave Linkwitz-Riley design. Although more expensive than other crossover designs, the benefits provided by the Linkwitz-Riley design have been well documented. These benefits include: Absolutely flat frequency response throughout the bandpass, without the characteristic ripple near the crossover point exhibited by other designs. The sharp 24 dB per octave roll-off of the filters ensures that the transducers arent reproducing frequencies outside of their capabilities. The acoustic sum of the two driver responses is unity at the crossover frequency, resulting in perfect power response. Our heroic engineers have worked carefully to ensure that the SRM450 also provides perfect phase response. This diligence has yielded phenomenal accuracy, even if you are standing 20 feet away.

The Active Advantage

There are a number of advantages to using an active speaker system over a passive loudspeaker: The internal crossover is active, and its low power circuitry operates on linelevel signals. It does not waste speakerlevel power like a passive crossover with large coils, caps, and resistors. The input signals are crossed over before they reach the amplifiers, so each amplifier only receives the correct frequency range for its driver. The amplifiers are designed specifically for these speaker load impedances. There is no guesswork as to what load each amplifier has to drive, so they can provide maximum acoustic output from the speakers, yet minimize the danger of speaker damage due to overdriving a lesser amplifier. The connecting wires between the amplifier outputs and the drivers are kept to a minimum, so the damping factor of the amplifier isnt compromised by the resistance of long speaker cables. In addition, all the power from the amplifier is transferred directly to the drivers with no speaker cable losses. The acoustic sum of the outputs from the two drivers is optimized electronically, as well as physically, so the amplitude response is flat and there is no lobing error. The presence of active circuits within the speaker cabinet allow the designer to add on extra details, such as a high quality mic/line input section and optional accessory modules. In short, all the complex interconnected components in the system are designed to work in harmony with each other to produce the best possible sound. (Even for Uncle Berts star performance on spoons!)

The Cabinet

The SRM450 cabinet was designed to be the strongest molded composite cabinet on the planet. This material is as strong as concrete, and rigid enough to prevent unwanted vibrations in the cabinet. It has built-in fly points for hanging, and a socket in the bottom for mounting on a tripod stand. Although it is an exceptional choice for installed sound situations, its light weight and durable finish also make it ideal for portable sound system use. The asymmetrical trapezoidal design of the cabinet makes it easy to use as a floor wedge for stage monitor applications.

HOOKUP DIAGRAMS

Quick Start
1. Start with the following settings on the back of the SRM450: Turn the POWER switch off (down). Set the TIMED TURNOFF, CONTOUR, and LOW CUT switches out. WARNING: Turn the LEVEL control down (counterclockwise) before every use. If not, you could be in for a startling surprise, especially if the last time you used it was with a microphone and now you want to connect a linelevel source. 2. Connect the output from your signal source (mixing console, microphone, preamp, or other mic- or line-level source) directly to the INPUT connector on the back of the SRM450. It accepts balanced line-level signals from mixers, preamplifiers, CD players, tape decks, etc., and accepts direct connections from dynamic microphones. 3. Connect the supplied AC power cord to the IEC socket on the back of the SRM450. Plug the other end into an AC outlet properly configured with the correct voltage for your particular model. 4. Turn on your signal source. Make sure its Master Volume control (if it has one) is turned all the way down. 5. Turn on the SRM450 POWER switch. 6. Start the signal source, whether it be speaking into a microphone or starting a CD player. Adjust any volume controls on the signal source for normal operation. 7. Slowly turn up the LEVEL control on the back of the SRM450 until the desired volume is reached (and the PEAK light does not come on). Always wear hearing protectors if you are close when it is playing at high levels. 8. If there is no sound, always turn down the SRM450 LEVEL control before investigating. There may be a mixer or preamplifier mute or tape switch engaged, or a mic switch off.

DESIGNED BY MACKOIDS IN WOODINVILLE, WA USA

Next Next

DESIGNED BY MACKOIDS IN WOODINVILLE, WA USA DESIGNED BY MACKOIDS IN WOODINVILLE, WA USA
Left Line level Output Mixer or Preamplifier

Right Line level Output

1202-VLZ PRO

Daisy-chaining SRM450s

SRM450: STEREO OPERATION WITH A MIXER, AND USING THE THRU JACK
For microphone connections, you can daisy-chain up to two SRM450s using the THRU jacks as shown. Take great care to point any microphones away from the SRM450s, otherwise you may get feedback.

Dynamic Microphone

THRU Output
SRM450: USING A MICROPHONE AND THE THRU JACK
The SRM450 can be used with a Mackie SWA1501 (or SWA1801) subwoofer to create an incredibly powerful system. The active crossover inside the SWA1501 splits the full-range input signal into two ranges. The SWA1501 plays the low-frequency range through its 500 watt amplifier and 15-inch woofer, and sends the high-pass range to the SRM450. The SRM450 can be pole mounted on top of the SWA1501 as shown, saving the cost of a tripod stand.
Pole Mount Line-level Hi-pass out

ACTIVE

Power Cord Line-level Hi-pass out

Pole Mount

Power Cord

Full Range

Power Cords
SWA1501 plays the low frequencies
SRM450: BIAMPING WITH A POWERED SUBWOOFER

REAR PANEL DESCRIPTION

The SRM450 has several connectors, controls, and indicators that you should understand.

TIMED TURNOFF

When this switch is pushed in, the builtin amplifiers turn on and off depending on the presence or absence of an input signal. An input signal level of 45 dBu (minimum) activates the auto-on function. A silent period greater than three minutes activates the auto-off function. The blue LED on the front of the speaker reflects the state of the amplifiers.

IEC Socket

This is where you connect the supplied AC linecord to provide AC power to the SRM450s built-in power amplifiers. Plug the linecord into an AC socket properly configured for your particular model. Note: If you happen to lose the AC linecord, replacements are readily available at any office or computer supply store. Always use a three-pin plug with a ground pin.

THERMAL Indicator

This LED lights if the heatsink temperature exceeds a safe operating temperature and triggers the thermal safety switch. When this occurs, the built-in amplifiers shut down until the heatsink temperature cools back down. Then the thermal switch resets itself, the THERMAL indicator turns off, and normal operation resumes. If the SRM450 keeps shutting down, make sure there is plenty of ventilation to the rear panel. Please see Thermal Considerations on page 12.

POWER Switch

Switch up to turn the SRM450 on, and switch down to turn it off. Make sure the level control is down before you turn it on.

POWER ON Indicator

When the POWER switch is turned on, and the linecord is connected to an active AC Mains supply, this indicator, located just above the POWER switch, glows to let you know that youre ready to rock and roll. The cool blue LED on the front of the speaker works in the same way.

CONTOUR

Pushing in this switch engages a filter that provides 3 dB of boost to the low and high frequencies (below 100 Hz and above 12 kHz). This provides a punchy, crisp sound for most live music applications. You can experiment with this switch by leaving it out for a while, then pushing it in to determine which way sounds best for your application. It is especially useful when listening at lower volumes, as it highlights the bass like a Loudness switch, in addition to boosting the highs.

SIGNAL PRESENT Indicator

This LED illuminates whenever there is a signal present at the INPUT connector on the rear panel. It senses the signal just prior to the LEVEL control, so even if the LEVEL control is turned down, the SIGNAL PRESENT indicator still works.

PEAK Indicator

When the signal levels at the amplifier outputs approach clipping, a soft compression circuit is activated that reduces the input signal. The PEAK LED lights whenever the compression circuit is active. At this time, the SRM450 may reach sound pressure levels of 120 dB or more. Its okay for the PEAK indicator to blink occasionally, but if it blinks frequently or continuously, either turn down the signal level at the mixer or other signal source, or turn down the SRM450s LEVEL control. Wear hearing protection if you are close to the SRM450 playing at high levels.

LOW CUT

Pushing in this switch engages a low-cut filter, which rolls off the low frequencies below 75 Hz. This is useful for minimizing stage noise (rumble) and microphone handling noise. It is highly recommended that you engage this switch when using the SRM450 as a stage monitor. This allows the bass amplifier to utilize its power for those frequencies useful in stage monitor applications.

INPUT Connector

This is a female XLR-type connector that accepts a balanced or unbalanced mic- or line-level signal.
This is used to adjust the signal level, going into the built-in power amplifiers, from Off up to 40 dB of gain. Since the SRM450 incorporates Mackies world-class low-noise mic preamp technology, you can connect either a line-level or a microphone-level signal to the input, and use this control to adjust the level correctly. There is no phantom power for a microphone, so you should use a dynamic mic, or use a condensor type if it has its own battery power. Follow the Quick Start guide on page 6 for setting the LEVEL control. For most applications, it will be in the NORMAL position (12 oclock). If you have a particularly high line-level signal connected to the SRM450, you may need to turn the control down to the LINE indication (9 oclock). If you have a low line-level or mic-level signal connected, you may need to turn the LEVEL control up to the MIC indication (3 oclock).

THRU Connector

This is a male XLR-type connector that produces exactly the same signal that is connected to the INPUT jack. It can be a balanced or unbalanced mic- or line-level signal. Use it to daisy-chain several active speakers together off the same signal source.

ACCESSORY Plate

This removable plate provides access to install future accessory modules.

CONNECTIONS

The SRM450 has a female XLR input that accepts a balanced or unbalanced micor line-level signal. When connecting a balanced signal, be sure its wired per AES (Audio Engineering Society) standards: XLR Pin 2 Pin 3 Pin 1

PLACEMENT

The SRM450 active speakers are designed to sit on the floor, a tabletop, or to fit on a standard tripod speaker stand. They can also be suspended by the rigging points, shown opposite. You can lay the cabinet down on its side and use the SRM450 as a floor monitor. The asymmetrical trapezoidal shape of the cabinet provides a perfect angle for aiming up toward performers from the front of the stage. When used for monitor applications, we recommend engaging the LOW CUT filter. As with any powered components, protect them from moisture. If you are setting them up outdoors, make sure they are under cover if you expect rain. The SRM450 generates magnetic fields. Do not place them closer than two or three feet (60100 cm) from TV or computer monitors. Check the screen for any change in color or distortion. Do not place any magnetic audio or video tapes or computer discs near the SRM450s.
Hot (+) Cold () Shield (Ground)
There is also a male XLR connector labeled THRU. This allows you to connect more than one SRM450 to the output of your mixing console. Simply plug the signal source output into the first INPUT jack, and patch that speakers THRU jack to the next INPUT jack, and so on, daisy-chaining multiple speakers (see diagram on page 6). There is a limit to how many you can daisy-chain together. A general rule is to maintain a load impedance ten times or more than the source impedance to prevent excessive loading on the source. For example, if your mixer has an output impedance of 120 ohms, then you can daisy chain up to sixteen SRM450s. This is a load of 1250 ohms (SRM450 input impedance=20 kohms; 16 of these in parallel=1250 ohms). Since microphones typically have a higher output impedance, you should limit daisy-chaining from a mic source to two SRM450s (see the diagram on page 7). The THRU jack is wired straight from the INPUT connector there is no electronic circuitry between so the signal coming out of the THRU jack is exactly the same as the signal going in.

Both Sides

SRM450

Rigging Points

Bottom
If you are hanging them in an inaccessable place, such as over a lions cage, make sure that you first complete the sound check and set the SRM450 LEVEL correctly. Also set the TIMED TURNOFF switch if you want the SRM450 to turn on when there is a signal present. It will also turn off after three or more minutes of silence. 11

THERMAL CONSIDERATIONS

The amplifiers inside the SRM450 are convection cooled by a large heatsink. For efficient cooling, it is important to allow at least six inches of free space behind the SRM450. If you use the SRM450 on its side for stage monitor applications, we highly recommended that you engage the rear panel LOW CUT switch. This will allow more power for useful monitor frequencies, while reducing the possibility of overheating. If the ambient temperature in the room is high, it could cause the amplifiers to overheat. In this case, you should try aiming a fan at the heatsink to increase the air flow through the fins. During a performance, dont have it cranked so high that the rear panel PEAK LED is blinking frequently or lighting continuously. You should turn down the LEVEL control a notch or two to avoid overheating the amplifiers or your neighbors. If the amplifiers do overheat, a built-in thermal switch will activate, placing the amplifiers into standby. When the amplifiers have cooled down to a safe operating temperature, the thermal switch will reset and the SRM450 will resume normal operation.

AC POWER CONSIDERATIONS

Be sure the SRM450 is plugged into an outlet that is able to supply the correct voltage specified for your model. If the voltage should drop below 97% of the specified line voltage, the built-in amplifiers will no longer be able to supply rated power. (They will continue to operate down to 75% of the rated line voltage, but wont reach full power, resulting in lower headroom). Under maximum S.P.L. conditions, where musical peaks are clipping, the SRM450 120V model draws 2.5 amps on average (1.3 amps for the 240V model). Under normal conditions, the current draw is below 1 amp. We recommend that a stiff (robust) supply of AC power be used because the amplifiers place high current demands on the AC line. The more power that is available on the line, the louder the speakers will play and the more peak output power will be available for cleaner, punchier bass. A suspected problem of poor bass performance is often caused by a weak AC supply to the amplifiers.

AC Power Distribution

A 240VAC center-tapped service entrance transformer serves the majority of AC outlets encountered in homes and clubs (in the U.S.). This provides two phases of AC power on either side of the center tap, at 120V each. If lighting is used in a show, it is preferable to power the lights from one leg of the service, and power the audio equipment from the other leg. This will help minimize noise from the lights coupling into the audio (particularly if SCRs, or light-dimmer switches, are used).

HIGH VOLTAGE POWER LINE

HEATSINK

THERMAL

120V PRIMARY WINDING 120V 240V SECONDARY WINDING

TRANSFORMER

EARTH GROUND (NEUTRAL)
240V CENTER-TAPPED SECONDARY
Wherever possible, connect all of your equipment to the same electrical circuit. This will help reduce the possibility of a ground loop problem causing an annoying hum in your speakers. Low power components such as tape decks, mixers, effects processors and CD players should be connected to the same outlet as the SRM450s. Use fused power strips as shown in the diagram below. Make sure that the total current draw of your components does not exceed the capability of the outlets and power strips. For the US 120 V model: A maximum of five SRM450s can be connected per 15A service. This allows each SRM450 to be safely operated at its maximum level. When turning your system on, turn on the SRM450s last. This will stop any turnon thumps and bangs from your source equipment being amplified. When turning off your system, turn off the SRM450s first. This will prevent any turn-off thumps and bangs from your source equipment being amplified.
When setting up for a show, often you are plugging into an AC power distribution system you know nothing about. You may even be faced with 2-wire outlets that are missing the third safety ground pin. Its a good idea to have a three-wire AC outlet tester in your toolbox so you can check the outlets yourself to make sure they are wired correctly. These testers will tell you if the polarity of the hot and neutral wires is reversed and if the safety ground is disconnected. Dont use an outlet if it is wired improperly! This is to protect yourself as well as your equipment.
Never remove the ground pin on the power cord of the SRM450 or any other component. This is very dangerous.

SRM450: AC CONNECTIONS

SERVICE INFORMATION

Warranty Service

Details concerning Warranty Service are spelled out on page 19 of this manual. If you think your loudspeaker has a problem, please do everything you can to confirm it before calling for service, including reading through the following troubleshooting section. Doing so might save you from being deprived of your Mackie loudspeaker. If you do find the problem, make sure that you turn down the LEVEL controls and turn off the SRM450 before correcting it or changing any connections. Of all Mackie products returned for service (which is hardly any at all), many are coded CND Could Not Duplicate which usually means the problem lay somewhere else in the system. The following troubleshooting tips may sound obvious, but here are some things you can check:

Need Help?

You can reach a technical support representative Monday through Friday from 7 AM to 5 PM PST at: 1-800-258-6883 After hours, visit www.mackie.com and click Support, or email us at: techmail@mackie.com

SRM450 SPECIFICATIONS

System Specifications
Frequency Response (3 dB) 55 Hz 18 kHz Frequency Range (10 dB) 45 Hz 20 kHz Directivity Factor; Q (DI) 9.95 (9.98), averaged 2 kHz to 10 kHz Max SPL Long-term @ 1m 124 dB Max SPL Peak @ 1m 127 dB Crossover Linkwitz-Riley, 24 dB/octave @ 1600 Hz

Line Input Power

US 120 VAC, 60Hz Recommended amperage service 2.5 amps Europe 230 VAC, 50Hz Recommended amperage service 1.25 amps Japan 100 VAC, 50/60Hz Recommended amperage service 3.0 amps AC Connector 3-pin IEC 250 VAC

Control System Function

Electronic Crossover Phase Alignment Equalization Parametric Equalization
Input Type Balanced Differential Input Impedance 20 kohms Input Protection RFI and level protected Sensitivity Line: +4 dBu (center detent) Mic: 36 dBu Maximum Input Level +22 dBu Low-Cut Frequency 75 Hz, Second-order filter Acoustic Contour Equalization Peaking: +3 dB @ 100 Hz, +3 dB @ 12 kHz Accessory Interface 15 VDC, normalized signal I/O Operating Temperature Range 10C to 45C (14F to 113F)

Safety Features

Over-Excursion Protection Second-Order High-Pass Filter Thermal Protection Amplifier shutdown, auto-reset Low-Line Voltage Shut Down 60% Nominal line Driver Protection Independent LF and HF compressors Low-Freq Roll-Off Dynamic, signal-level dependent

Construction Features

Basic Design Asymmetrical Trapezoidal Enclosure Alignment Sixth-Order Material Polypropylene Finish Grey, textured finish Handles One on each side, one on top Mounting Methods Integrated mounting points, M10 Two each located on each side, top, bottom, and rear of enclosure Perforated metal with weatherGrille resistant coating Display LEDs Signal Present, Peak, Power ON, and Thermal

Power Amplifiers

Low-Frequency Power Amplifier Rated Power 300 watts* Rated THD < 0.1% Cooling Convection Extrusion Design Class G, Parametric Servo Feedback High-Frequency Power Amplifier Rated Power 100 watts* Rated THD < 0.1% Cooling Convection Extrusion Design Conventional Class AB
*Rated power is continuous rms wattage into transducers rated impedance @ 1 kHz for the HF amplifier and @ 100 Hz for the LF amplifier.

Physical Properties

Height Width Depth Weight 26.0 in/660 mm 15.4 in/390 mm 14.8 in/376 mm 51 lb/23.2 kg

Transducers

Low-Frequency Transducer Diameter 12 in/300 mm Voice Coil Diameter 2.5 in/63 mm Sensitivity (1W@1m) 98 dB Nominal Impedance 8 ohms Power Handling 450 watts, program Frequency Range 45 Hz 3 kHz High-Frequency Transducer Diaphragm Diameter 1.75 in/44.5 mm Diaphragm Material Titanium Sensitivity (1W@1m) 106 dB Nominal Impedance 8 ohms Power Handling 100 watts, program Frequency Range 1 kHz 20 kHz Horn Design Type Mouth Size Throat Diameter Horizontal Coverage Vertical Coverage Conical and Exponential 12 in/304.8 mm (W) x 7 in/177.8 mm (H) 1 in/25.4 mm 90 (1 kHz20 kHz) 45 (2.8 kHz20 kHz)

Options

PA-A1 forged shoulder eyebolt hardware (M10 x 1.5 mm x 20 mm)

Disclaimer

Since we are always striving to make our products better by incorporating new and improved materials, components, and manufacturing methods, we reserve the right to change these specifications at any time without notice. Mackie., the Running Man figure, and FR Series are registered trademarks of LOUD Technologies Inc. All other brand names mentioned are trademarks or registered trademarks of their respective holders, and are hereby acknowledged. 2003 LOUD Technologies Inc. All Rights Reserved.
THRESHOLD LOW CUT CONTOUR HI-PASS HI-FREQ HI-FREQ AMP COMPRESSOR TWEET J15

SRM450 BLOCK DIAGRAM

SIGNAL LED THERMAL LED POWER LEDS SIGNAL SENSE LOW AC VOLTS SENSE MUTE ON/OFF CONTROL MUTE THERMAL SWITCH MUTE 40-120 Hz DELAY SWEEPING FILTER 176uS LO-FREQ AMP LO-PASS COMPRESSOR + MID VDC + HI VDC THRESHOLD LPF THRESHOLD + LO VDC
PEAK DETECTION PEAK LIGHT

+15VDC

TIMED TURNOFF LO-FREQUENCY DRIVER

SIGNAL SENSE

POWER SWITCH
BASS CONTROL SERVO LOOP SENSE RESISTOR
TOROIDAL POWER TRANSFORMER
MACKIE SRM450 BLOCK DIAGRAM (#060322SEDF)

SRM450 LIMITED WARRANTY

Please keep your sales receipt in a safe place.
A. LOUD Technologies Inc. warrants all materials, workmanship and proper operation of this Mackie SRM450 for a period of five years from the original date of purchase with the following exception: warranty on all its loudspeaker components including woofers and compression drivers are only warranted for two years. If any defects are found in the materials or workmanship or if the product fails to function properly during the applicable warranty period, LOUD Technologies, at its option, will repair or replace the product. This warranty applies only to equipment sold and delivered within the U.S. by LOUD Technologies Inc. or its authorized dealers. B. Failure to register online or return the product registration card will not void the five-year warranty. C. Service and repairs of Mackie products are to be performed only at the factory (see D below) OR at an Authorized Mackie Service Center (see E below). Unauthorized service, repairs, or modification will void this warranty. D. To obtain factory service: 1. Call LOUD Technologies at 800/258-6883, 7 AM to 5 PM Monday through Friday (Pacific Time) to get a Return Authorization (RA). Products returned without an RA number will be refused. 2. Pack the SRM450 in its original shipping carton. If you do not have the carton, just ask for one when you get your RA number, and well send a shipping carton out promptly. More information on packing can be found in the Service section of this manual. Also include a note explaining exactly how to duplicate the problem, a copy of the sales receipt with price and date showing, and your return street address (no P.O. boxes or route numbers, please!). If we cannot duplicate the problem or establish the starting date of your Limited Warranty, we may, at our option, charge for service time. 3. Ship the product in its original shipping carton, freight prepaid to: MACKIE SERVICE DEPARTMENT 16220 Wood-Red Road NE Woodinville, WA, 98072, USA IMPORTANT: Make sure that the RA number is plainly written on the shipping carton. E. To obtain service from an Authorized Mackie Service Center: 1. Call LOUD Technologies at 800/258-6883, 7 AM to 5 PM Monday through Friday (Pacific Time) to get: 1) The name and address of your nearest Authorized Mackie Service Center and 2) A return authorization (RA). You must have an RA number before taking your unit to a service center. 2. Make sure that you have a copy of your loudspeakers sales receipt from the store where you bought the product. It is necessary to establish purchase date and thus determine whether or not your loudspeaker is still under warranty. If you can't find it, the Authorized Service Center may charge you for repairs even if your loudspeaker is still covered by the Five-Year Limited Warranty. 3. Make sure that the problem can be duplicated. If you bring your loudspeaker to an Authorized Service Center and they can't find anything wrong with it, you may be charged a service fee. 4. If the Authorized Mackie Service Center is located in another city, pack the loudspeaker in its original shipping carton. More information on packing can be found in the Service section of this manual. 5. Contact the Authorized Mackie Service Center to arrange service or bring the loudspeaker to them. F. LOUD Technologies and Authorized Mackie Service Centers reserve the right to inspect any products that may be the subject of any warranty claims before repair or replacement is carried out. LOUD Technologies and Authorized Mackie Service Centers may, at their option, require proof of the original date of purchase in the form of a dated copy of the original dealers invoice or sales receipt. Final determination of warranty coverage lies solely with LOUD Technologies or its Authorized Service Centers. G. Mackie loudspeakers returned to LOUD Technologies and deemed eligible for repair or replacement under the terms of this warranty will be repaired or replaced within thirty days of receipt by LOUD Technologies. LOUD Technologies may use refurbished parts for repair or replacement of any product. Products returned to LOUD Technologies that do not meet the terms of this Warranty will be repaired and returned C.O.D. with billing for labor, materials, return freight, and insurance. Products repaired under warranty at the factory will be returned freight prepaid by LOUD Technologies to any location within the boundaries of the USA. H. LOUD Technologies warrants all repairs performed on Mackie products for 90 days or for the remainder of the original warranty period. LOUD Technologies assumes no responsibility for the quality or timeliness of repairs performed by Authorized Mackie Service Centers. I. This warranty is extended to the original purchaser and to anyone who may subsequently purchase this product within the applicable warranty period. J. This is your sole warranty. LOUD Technologies does not authorize any third party, including any dealer or sales representative, to assume any liability on behalf of LOUD Technologies or to make any warranty for LOUD Technologies Inc. K. THE WARRANTY GIVEN ON THIS PAGE IS THE SOLE WARRANTY GIVEN BY LOUD TECHNOLOGIES INC. AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS AND IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE WARRANTY GIVEN ON THIS PAGE SHALL BE STRICTLY LIMITED IN DURATION TO FIVE YEARS FROM THE DATE OF ORIGINAL PURCHASE FROM AN AUTHORIZED MACKIE DEALER. UPON EXPIRATION OF THE APPLICABLE WARRANTY PERIOD, LOUD TECHNOLOGIES INC. SHALL HAVE NO FURTHER WARRANTY OBLIGATION OF ANY KIND. LOUD TECHNOLOGIES INC. SHALL NOT BE LIABLE FOR ANY INCIDENTAL, SPECIAL, OR CONSEQUENTIAL DAMAGES THAT MAY RESULT FROM ANY DEFECT IN THE MACKIE PRODUCT OR ANY WARRANTY CLAIM. Some states do not allow exclusion or limitation of incidental, special, or consequential damages or a limitation on how long warranties last, so some of the above limitations and exclusions may not apply to you. This warranty provides specific legal rights and you may have other rights which vary from state to state.

LOUD Technologies Inc.

16220 Wood-Red Road NE Woodinville, WA 98072 USA US and Canada: 800.898.3211 Europe, Asia, Central and South America: 425.487.4333 Middle East and Africa: 31.20.654.4000 Fax: 425.487.4337 www.mackie.com E-mail: sales@mackie.com

SRM450

The Mackie SRM450 is a full range, portable, active
loudspeaker system providing high output, wide dispersion, and low distortion performance in a compact, composite molded enclosure. Two amplifiers independently power a high precision 12-inch professional woofer and 1.75-inch diaphragm titanium compression driver with a 1-inch exit throat. A sophisticated electronic control system provides phase correction, crossover, and five modes of thermal and active system protection. The SRM450 is fitted with a specially designed horn assembly that combines both an exponential and conical geometry. With the addition of a multi-cell horn throat aperture, the complete assembly provides unparalleled dispersion characteristics. The result is super smooth, lowdistortion linear audio performance across the entire specified coverage angle of 90 degrees. A servo feedback circuit has been added to the lowfrequency amplifier in order to provide extended bass response and woofer control. This design provides simultaneous positive and negative signal feedback information from the woofers magnetic circuit to the low-frequency amplifier. This loop locks the two devices together and provides extreme control of the woofer mass. The result is extended linear movement of the woofer cone resulting in very high SPL low-frequency output levels. Careful attention has been given to the ergonomic features of the system. The center of gravity, handle locations, handle design, position of fly-points, and ease of use have been carefully thought out. There is also an integrated pole mount on the bottom of the cabinet and a weather-resistant steel grille. The asymmetrical trapezoidal cabinet has been designed to provide an ideal floor monitoring position. The SRM450 features a number of unique control features including a single microphone and line-level control in addition to a high-pass filter for floor monitoring applications, an AC timed turn off function that is ideal for fixed or remote installations, and a contour switch for low-level or background-level sound reinforcement applications. The SRM450 cabinet is constructed of high pressure injected polypropylene. The enclosure features ample amounts of reinforcement ribbing and structural strengthening resulting in a strong, super-rigid design providing ideal acoustical characteristics.
Active 2-Way Sound Reinforcement Speaker System
Bi-amplification with 300 watts rms low-frequency and 100 watts rms high-frequency power 127 dB peak SPL Wide dispersion, studio-quality high-frequency horn with multi-cell aperture throat Large format exponential/conical high-frequency horn mouth State-of-the-art precision 1.75-inch titanium compression driver Servo feedback controlled 12-inch high-efficiency, light mass woofer Single mic/line level control High-pass switch for floor monitoring applications Contour switch provides ideal low to medium level music playback equalization Timed turn-off AC switch Complete electronic and component protection circuitry Electronic equalization and phase alignment Professional trapezoidal enclosure design Built-in pole mount cup on bottom Tilts on its side for use as a stage monitor Correctly weight-balanced with two comfortable side handles for easy carrying and set up

Features

Applications
Live and playback applications Small to medium sized portable PA systems Corporate events Houses of worship

O Fo F66 PAAG E SE S P G

SPEAKER
System Acoustic Frequency Response (3 dB) Frequency Range (10 dB) Directivity Factor; Q (DI)

Active Speaker System

Low Frequency Section Number of Drivers Woofer Diameter Voice Coil Diameter Power Handling Sensitivity Frequency Range Magnet Type

SRM450 Specifications

55 Hz-18 kHz 45 Hz-20 kHz 9.95 (9.98), averaged 2 kHz to 10 kHz Max SPL Long-term 124 dB Max SPL Peak 127 dB Crossover Linkwitz-Riley, 24 dB/octave @ 1600 Hz Audio Input Bal./unbal. Female XLR Loop-through (parallel w/input) Bal./unbal. Male XLR Input Protection RFI and level protected Level Control Rotating knob (off to +40 dB) Sensitivity (center detent) Line: +4 dBu Mic: 36 dBu Maximum Input Level +22 dBu Low-Cut Frequency 75 Hz second-order high-pass filter Acoustic Contour Equalization (peaking) +3 dB @ 100 Hz +3 dB @ 12 kHz Accessory Interface 15 VDC, normalized signal I/O Operating Temperature Range 10C to 45C (14F to 113F) Amplifiers Total Amplifier Power 400 watts continuous* High Frequency 100 watts* Type Class AB Rated THD.03% Low Frequency 300 watts* Type Class G with parametric servo feedback Rated THD 0.03%
*Rated power is continuous rms wattage into transducers rated impedance @ 1 kHz for the HF amplifier and @ 100 Hz for the LF amplifier
in/300 mm 2.5 in/63 mm 450 watts rms (long term)dB (1W@1m) 45 Hz to 3000 Hz Ferrite
Construction Features Basic Design Asymmetrical Trapezoidal Material Polypropylene Finish Grey, textured finish Handles Two on sides, one on top Grille Perforated metal with weatherresistant coating Line Input Power Power Consumption US Recommended amperage service Europe Recommended amperage service Japan Recommended amperage service AC connector Control System Function Electronic Crossover Phase Alignment Equalization Parametric equalization Safety Features Protection Low Frequency Dynamic Bass Protection, Independent LF and HF Compressors, Power Supply and Amplifier Thermal Protection Signal Present, Peak, Power ON, and Thermal (Cool Down Auto Reset) 26.0 in/660 mm 15.4 in/390 mm 14.8 in/376 mm 51.0 lb/23.2 kg 320W with musical program and Peak LED blinking 120 VAC, 60Hz 2.5 amps 230 VAC, 50Hz 1.25 amps 100 VAC, 50/60Hz 3.0 amps 3-pin IEC 250 VAC
High Frequency Section Diaphragm Size Horn Exit Diameter Power Handling Sensitivity Frequency Range Nominal Impedance Diaphragm Material Magnet Type Horn Design Horizontal Coverage Vertical Coverage Type Mouth Size Throat size
1.75 in/44.5 mm 1.0 in/24.5 mm 100 watts rms (long term)dB (1W@1m) 1000 Hz to 20 kHz 8 ohms Damped titanium Ferrite kHz to 20 kHz avg. 45 2.8 kHz to 20 kHz avg. Exponential and conical 12.0 in x 7.0 in/ 30.5 cm x 17.8 cm 1.0 in/2.5 cm
Display LEDs Physical Height Width Front Depth Weight
Options PA-A1 Eyebolt (M10 x 1.5 mm x 20 mm)
Measured on-axis in the far field, referenced back to 1 watt rms from maximum power and to 1 meter distance using the inverse square law.

90 120

SRM450 Vertical Polars

120 60

30 200Hz

30 500Hz

250Hz 315Hz 400Hz

630Hz 800Hz 1kHz

30 1.25kHz

30 3.15kHz

1.6kHz 2kHz 2.5kHz

4kHz 5kHz 6.3kHz

240 270
SRM450 Vertical Off-Axis Frequency Response (UP)

Attenuation (dB)

0 deg 10 deg

20 deg 30 deg

10kHz 12.5kHz 16kHz

40 deg

Frequency (Hz)
SRM450 Vertical Off-Axis Frequency Response (DOWN)

10000 20000

SRM450 Horizontal Polars

60 200Hz 250Hz 90 270

60 500Hz 630Hz 90 800Hz 1kHz

315Hz 400Hz

60 1.25kHz 1.6kHz 90 270
60 3.15kHz 4kHz 90 5kHz 6.3kHz

2kHz 2.5kHz

210 180

60 8kHz 10kHz 90

12.5kHz 16kHz
SRM450 Horizontal Off-Axis Frequency Response
Attenuation (dB) 0 deg 10 deg
SRM450 Frequency Response On-Axis
SPL, 100 dB @ 1kHz (ref.)
SRM450 Beamwidth vs. Frequency

SRM450 Directivity Index

6 dB Beamwidth (degrees)

Vert BW Horz BW

1 20000

SRM450 Input Panel

120 VAC 60Hz 320W
DESIGNED BY MACKOIDS IN WOODINVILLE, WA USA

SRM450 Dimensions

15.4 in/390 mm 14.8 in/376 mm

15.4 in/390 mm

O Fo F66 PAGESE S PAG

Directivity Factor (Q)

Directivity Index (DI), dB

26.0 in/660 mm

14.8 in/376 mm
Thermal protection shall be provided by a thermal sensor mounted on the heatsink, which monitors the heatsink temperature and triggers the thermal protection circuit should the temperature exceed 158 F (70 C). The Thermal LED shall light and the input signal to the amplifiers shall be muted until the heatsink cools to a safe operating level, at which point the thermal protection circuit auto-resets and normal operation resumes. Overload protection for the LF driver shall be provided by a dynamically variable high-pass filter, the corner frequency of which shall slide from 40 Hz to 120 Hz as the LF amplifier output approaches clipping. Additional protection shall be provided for both the LF and HF drivers by a compressor circuit, which monitors the low-frequency and high-frequency amplifier outputs and reduces the gain as the amplifiers approach clipping. The system shall include an XLR input connector, an XLR loop-through signal connector, a level control capable of providing up to 40 dB of gain to accommodate both microphone and line-level signal levels, a sound contour switch providing +3 dB of equalization at 100 Hz and 12 kHz, a high-pass switch for filtering out frequencies below 75 Hz, and a timed turn-off switch for self shut-down. The loudspeaker enclosure shall have an asymmetrical trapezoidal shape and shall incorporate 10 integrated M10 fly points, two side handles, and a top relocation handle. The enclosure shall be molded from polypropylene material. The front of the loudspeaker shall be covered with a powder coated, weather-resistant perforated steel grille. The active two-way full-range loudspeaker system shall be a Mackie SRM450.

Architects and Engineers Specifications
The active two-way, full-range loudspeaker system shall incorporate one 12-inch low-frequency (LF) transducer and a 1-inch exit/1.75-inch diaphragm compression driver high-frequency (HF) transducer. The LF driver shall be mounted in a vented polypropylene molded enclosure tuned for optimum low-frequency response. The HF transducer shall be loaded on a multi-cell horn aperture and mounted on a combination exponential and conical horn. The system shall have a nominal coverage pattern of 90 (horizontal) x 40 (vertical). System frequency response shall vary no more than 3 dB from 55 Hz to 18 kHz measured on axis. The loudspeaker shall incorporate a Class G low-frequency amplifier capable of delivering 300 watts rms over a frequency range of 20 Hz-2000 Hz. The system shall incorporate a Class AB 100 watt rms amplifier specifically designed to power the HF driver over the range of 1500 Hz-20 kHz. The amplifiers shall be mounted on an aluminum heatsink, which shall be mounted on the rear of the speaker system, and shall be convection cooled.

SRM450 Block Diagram

THRESHOLD LOW CUT

J15 INPUT 1 THRU 3

CONTOUR HI-PASS HI-FREQ COMPRESSOR

HI-FREQ AMP

SIGNAL LED

THERMAL LED

POWER LEDS

SIGNAL SENSE

THERMAL SWITCH LOW AC VOLTS SENSE

+15VDC

MUTE ON/OFF CONTROL

PEAK DETECTION

PEAK LIGHT

TIMED TURNOFF

POWER SWITCH

SWEEPING FILTER

40-120 Hz DELAY

LO-PASS COMPRESSOR

LO-FREQUENCY DRIVER

LO-FREQ AMP

+ MID VDC

+ HI VDC

THRESHOLD

BASS CONTROL SERVO LOOP

TOROIDAL POWER TRANSFORMER

+ LO VDC

SENSE RESISTOR
MACKIE SRM450 BLOCK DIAGRAM (#060322SEDF)
Electronic files for this product available at: www.mackie.com This Specification Sheet Owner/Operators Manual SRM450_SS.PDF SRM450_OM.PDF
LOUD Technologies continually engages in research related to product improvement. New material, production methods, and design refinements are introduced into existing products without notice as a routine expression of that philosophy. For this reason, any current LOUD Technologies product may differ in some respect from its published description, but will always equal or exceed the original design specifications unless otherwise stated. 1999-2004 LOUD Technologies Inc. All rights reserved. Mackie and the Running Man figure are registered trademarks of LOUD Technologies Inc.