P1500 / P3000
Installation & Operation

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IN T E HE
PROFESSIONAL POWER AMPLIFIER AMPL
Declaration of Conformity
Application of Council Directive: 73 / 23 / EEC (Low Voltage Directive) 89 / 336 / EEC (EMC Directive) Standard(s) to which Conformity is Declared: EN55103-1 EN55103-2 EN60065 Manufacturers Name: Hafler Manufacturers Address: 546 South Rockford Drive, Tempe, Arizona 85281 Importers Name: Importers Address: Type of Equipment: 2-channel Audio Power Amplifier/Speaker Model No.: P1000CE TRM6CE P1500CE TRM8CE P3000CE TRM10sCE 2001 P4000CE TRM12sCE 2002 9505CE
Year of Manufacturing: 1999
Serial Number: I, the undersigned, hereby declare that the equipment specified above conforms to the above Directive(s) and Standard(s)
Place: Hafler Date: 09/01/1999 James C. Strickland, VP Engineering
PERFORMANCE SPECIFICATIONS

P1500/P3000

Frequency Response: 20Hz to 20kHz, 0.1dB 0.15Hz to 300kHz, +0/3dB Signal-to-Noise: Distortion: Slew Rate: CMRR: Input Impedance: Gain: >100dB A Weighted <0.2% 20-20kHz, typically.01% at 1kHz @ rated power into V/s 75dB at 1kHz 47k ohms per phase +14dB min. +29dB max.
Power Rating: Damping Factor: 75 wpc @8 , 85 wpc @ 4, 170 Watts mono @ (to 1kHz); 150 (to 10kHz); 18 (to 100kHz)
Input Sensitivity Range: 870mV - 4.8V (for 75 W @ 8) 650mV - 3.7V (for 85 W @ 4) Power Consumption: 60W / 500mA @ 120 VAC (Idle Power) 230W / 1.9A @ 120 VAC (1/8 Power 8) 325W / 2.70A @ 120 VAC (Max. Power 8)

19.00.717 8.410

Dimensions:
19"W x 8-12"D x 3-12"H (2-rack spaces)
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(48.26cm x 21.59cm x 8.89cm) Net Weight: 22 lbs. (9.98kg)

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trans nova

channel 1

channel 2
Power Rating: Damping Factor: 150 wpc @8 , 200 wpc @ 4, 400 Watts mono @ 8
400 (to 1kHz); 200 (to 10kHz); 18 (to 100kHz)
Input Sensitivity Range: 1.2V - 6.9V (for 150 W @ 8) 1.0V - 5.6V (for 200 W @ 4)

Power Consumption:

120W / 1.00A @ 120 VAC (Idle Power) 350W / 2.9A @ 120 VAC (1/8 Power 8) 600W / 5.00A @ 120 VAC (Max. Power 8)
19"W x 9-78"D x 3-12"H (2-rack spaces) (48.26cm x 25.08cm x 8.89cm)
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Net Weight:

23 lbs. (10.43kg) i
NOTICE - IMPORTANT SAFETY INFORMATION

CAUTION

RISK OF ELECTRIC SHOCK DO NOT OPEN
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. 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. the same three wire grounded connection. It is important that the blades of the equipments plug be able to fully insert into the mating receptacle. Never remove the round grounding pin on the plug in an attempt to mate to a two wire ungrounded receptacle: use a grounding adaptor with the grounding tab or wire suitably connected to earth ground. 11. NON-USE PERIODS During periods of extended non-use, the power cord should be unplugged from the power source. 12. CLEANING The equipment should be cleaned only as detailed in the operating instructions. 13. OBJECT AND LIQUID ENTRY Care should be taken so that objects and/or liquids, such as cleaning fluids or beverages, are not spilled into the enclosure of the equipment. 14. DAMAGE REQUIRING SERVICE Hafler equipment should be serviced by qualified service personnel when: A. The power supply cord or plug has been damaged, or B. Objects have fallen, or liquid has been spilled into the equipment, or C. The equipment has been exposed to rain, or D. The equipment does not appear to operate normally or exhibits a marked change in performance, or E. The equipment has been dropped, or the enclosure has been damaged. 15. SERVICING The user should not attempt to service the equipment beyond that which is described in the operating instructions. All other service should be referred to qualified service personnel. 16. CARTS AND STANDS The equipment should be used with carts or stands only of sufficient strength and stability for the use intended. An equipment and cart combination should be moved with care. Quick stops and starts, excessive force, and uneven surfaces may cause the equipment and cart combination to topple.

INTRODUCTION

The Hafler P1500 and P3000 are two channel professional power amplifiers. Passive cooling with large heatsinks is used for low mechanical noise. Our patented transnova circuit topology and MOSFET output stage ensures trouble free, long term operation and is backed by our five year warranty. This manual contains information on using the P1500 and P3000 amplifiers. It is organized into three main sections. Installation covers the location and connection of the amplifier in the system. Like many precision components careful attention to the initial setup can yield dividends in higher performance and trouble-free use. Operation covers the controls and features of the amplifiers and how to use them to get the best effect. The Technical Reference section contains field service information. In addition to the schematic and parts list there are block diagrams and an explanation of circuit operation useful for technicians. We strongly urge reading over the Installation and Operation portions of this manual before putting the amplifier into service. The circuitry used in the P1500 and P3000 is the latest refinement of our transnova (TRANSconductance NOdal Voltage Amplifier, US Patent 4,467,288) circuit. It has been proven to offer sound quality to satisfy the most analytic audiophile or the most demanding professional. The natural sound and realistic reproduction have made transnova amplifiers preferred in many critical installations. Since our pioneering use of MOSFETs in the DH200 amplifier, they have proven extremely fault tolerant even in abusive situations. This sturdiness enables the amplifier to drive reactive speaker loads without the performance and sound penalties imposed by elaborate protection schemes. Specialized circuits prevent damage to the amplifiers and speakers without affecting the audio signal. A soft start circuit prevents sending potentially destructive turn-on and turn-off transients to the speakers. A thermal sensing network monitors the heatsink temperature and shuts down the amplifier to protect from excessive operating heat. The need for internal fuses has been eliminated; a sensing circuit monitors the output and shuts down operation when it detects a short in the output load. Each channel of these amplifiers is built as a self-contained module which only requires mounting the heatsink and connection to the chassis-mounted transformer and binding posts to be fully functional. The circuit board contains all the operational components. This modular arrangement simplifies construction and improves service accessibility. The circuit board assembly makes extensive use of surface mount components in the low power portion of the audio circuitry. Automated equipment is used to place and solder the components which yields greater uniformity and reliability. The front panel has controls for input level adjustment and the power switch. In addition, LED indicators give a visual representation of the operating status of each channel. The THERMAL and SHORT indicators light to show when these protection circuits have been activated. The CLIP indicator helps prevent damaging the speakers by showing when the amplifier is overdriven. The SIGNAL indicator lights to show the presence of an audio signal.

15 0dB 15 0dB

Front Panel View
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XLR Connections

Mono Output: Use CH 1 Input ONLY Set CH 2 Gain to Max Set Output Level with CH 1 Gain Control

Phone Connections

WARNING: DO NOT REMOVE COVER
A Division of Rockford Corp. Tempe, AZ 85281 U.S.A. Made in the U.S.A.
Audio Ground Chass. Float
Mono 2-Ch 115V ~ 60Hz PV T4A
CAUTION: For continued TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. protection from risk of fire, replace only with CH 2 Mono + C H 1 same type and rating of fuse. + 8 + 4-8

CH 1 (Mono)

Rear Panel View

INSTALLATION

LOCATION The P1500 and P3000 power transformer can generate a substantial magnetic field, so caution should be exercised in the placement of low level components such as a tape deck, mixer or mic preamp to avoid inducing noise in the low level circuitry. The amplifiers can also produce considerable heat in normal operation so the primary consideration when determining a location for the amplifiers is to allow for adequate ventilation. The large heatsinks provide unrestricted airflow, but care must be taken to keep the slots in the bottom panel and top cover clear. If the amplifier is mounted in an equipment rack, make sure adjacent equipment does not impede cool air flow.
Rack systems should have two fans 4" to 5" in from the front of the amplifier blowing upward.
Inadequate ventilation can shorten component life, especially when other equipment raises the ambient air temperature, so circulating fans should be considered in tight quarters.
4" to 5" (from fan center)

(Bottom View)

Fan center approximately in line with edge of unit and starting of heat sink fins Fans placed 4" to 5" from front of unit Fans placed under the unit pointing upwards Recommended P1500 fan is 32 CFM x 2 Recommended P3000 fan is 100 CFM x 2
AC LINE The P1500U and P3000U operate from a 120 volt, 60Hz AC power line. The P1500CE and P3000CE operate from a 230 volt, 50-60Hz AC power line. Connection is made by a 16 gauge, IEC Type 320, grounded line cord. For safety considerations only a properly grounded (earthed) receptacle should be used. If a grounded circuit is not available do not break off the ground pin; use the proper adapter plug for a two wire receptacle. Mounted on the rear panel is the line fuse which interrupts the power to the amplifier. If this fuse blows replace it only with the same type and rating fuse. The correct replacement fuse value is printed on the rear panel of the amplifier. If the new fuse blows, this is an indication of a fault with the amplifier. Servicing should be performed only by a qualified technician.

INPUT The input jacks located on the back of the amplifier are dual function connectors which accept 1/4" Phone (Tip Ring Sleeve) or XLR plugs. The 1/4" Phone jack is connected according to conventional usage. The XLR jack is connected according to the IEC and AES standard.

XLR Balanced Input

Check output of source unit for proper signal polarity
1/4" TRS Balanced Input
INPUT Pin 1 = GND Pin 2 = (+) Pin 3 = ()
FROM SOURCE Tip = (+) Ring = () Sleeve = GND

FROM SOURCE

+ SHIELD
Many popular mixers use unbalanced outputs and can be used with the Hafler amplifier. To minimize residual ground noise, we recommend using twisted pair cable or short cable lengths in this type of configuration. XLR Unbalanced Input
Connect () and GND (shield) terminals at both ends of cable to prevent unstable amplifier operation
1/4" TRS Unbalanced Input
INPUT INPUT Pin 1 = GND Pin 2 = (+) Pin 3 = GND FROM SOURCE

SHIELD

Tip = (+) Sleeve = GND

SCHEMATIC DIAGRAM

P3000 shown. Ground switch in Chassis position, Mono switch in 2-Channel position. P1500 differences shown on parts list.

Removable Center Spread

OUTPUT CONNECTIONS The speaker output connectors are dual binding posts. These binding posts will directly accept 12 AWG wire or banana plugs and are spaced on 3/4" centers to accept dual banana plugs. MONOPHONIC USE For systems with high power requirements, the amplifiers can be configured for single channel bridged mono operation. To bridge the amplifier, set the rear panel Mono/2 Channel switch to the Mono position. The Channel 1 input and level control is used and the Channel 2 level control must be set to its maximum gain position. The speaker is connected to the RED output binding posts.
When the amplifier is bridged the output is floating. Any speaker which requires a common ground from the amplifier output cannot be used in this application. Since a bridged amplifier shares the load between the two channels, each channel will effectively drive half of the load. Therefore, for bridged mono operation we recommend using an eight ohm load as the minimum impedance.

OPERATION

POWER SWITCH The POWER switch is located on the front panel of the amplifier. An internal lamp indicates when it is turned on.
Standard practice is to turn the amplifier on last and off first when switching components to prevent sending damaging transients to the speakers.
It is possible to leave the power switch in the on position and switch the amplifier remotely through a power distribution block or preamp switched outlet. When doing so make sure the switch is rated for the current required by the amplifier. LEVEL CONTROLS The input sensitivity for each channel can be adjusted individually using the level controls on the front panel. The gain control on an amplifier is usually fully advanced to its maximum (rated) sensitivity. In public systems where it is necessary to match levels, the knobs can be removed and the controls adjusted with your fingers or a flathead screwdriver. Cover the holes with the enclosed plugs to restrict access. MONO SWITCH Conventional two-channel stereo operation is obtained with the MONO/2 CH switch in the 2-Channel position. For high powered single channel use, switch to MONO and use the Channel 1 input and connect the speaker to the RED binding posts.

For thermal considerations we do not recommend using less than an eight ohm load on the amplifier when running it in mono.
When the switch is set in the mono position, the Channel 1 (+) and () inputs are connected to the Channel 2 in reversed polarity, which inverts the Channel 2 output. The gain is controlled by the Channel 1 level adjustment; set Channel 2 to maximum.
SHORT CIRCUIT PROTECTION Due to the self-protecting properties of the output power MOSFETs, there is no need for sonically degrading voltage and current limiting circuits. To protect the amplifier from problems which may occur in the speaker line there is an overload detection circuit. In the event of a short in the speaker load or cables, the speaker detection circuit will shut down that channel and light the front panel SHORT indicator. If this happens, correct the fault and turn the amplifier off, then back on to reset.
LED INDICATORS Amplifier operation is monitored internally and each channel has four status LEDs. These indicators can be used for system troubleshooting in case of aberrant behavior. Signal Clipping Thermal Short Monitors the amplifier output and lights when a signal is present. The SIGNAL indicator is calibrated to activate at an equivalent input voltage of 30mV. Monitors the DRIVE SIGNAL and lights when the drive signal voltage exceeds the maximum for linear operation of the output MOSFETs. Indicates when the thermal protection has shut down the amplifier. This occurs when the heatsink temperature exceeds 90 C. Indicates when the output overload monitor detects a potentially damaging short and shuts down amplifier operation. After clearing the fault, restore normal function by turning the amplifier off, then on again.
WARM UP In order to achieve the best sonic performance from the amplifier, we recommend letting it warm up for 1 hour before beginning any critical listening. The amplifier may not deliver its full potential sound quality before this time has passed. CLEANING AND MAINTENANCE There is no requirement for regular maintenance on the electronic components of the amplifier. If the case becomes soiled it can be cleaned using a soft cloth and a mild detergent, such as spray window or glass cleaner. If the amplifier is located in a particularly dusty environment cleaning the inside with compressed air or vacuuming every 18 to 24 months is sufficient.

PC BOARD LAYOUT

C1221 Z3 Z Z2 C121 P4 P2 R165 P1 P3
ROCKFORD CORP PC-0812-H M.ALBERS

J8 R134 R131

Q10 R132 R40

Q12 R133

Q11 R138

Q5 R35 C36

Q4 Q116 R34 C124 TS1
R141 C116 C115 J4 R140 R136 R21 C126

R164 CR15 R17

R20 R19

C123 C1 R64 R1

C35 C125 R159
R139 C8 R129 C113 Q105 R128 Q6 Q7 Q104 R124 Q103

R33 R14 R39

R6 C22

R10 R16

R48 CR14

JW4 JW5 JW6

Q8 U2 R11 CR4 R53 R49

J5 C21 R61

R123 CR6

C29 R12 Q3 CR7

C28 CR3

R51 R54

C15 R46

R44 R45 R42

R15 C23 C17

R38 SW1

R62 R59

C18 Q2

CT2 AC3
C24 JW7 AC1 CT1 AC2 C6 C7 R37

C30 CR1

X2 X1 JW3

JW2 JW1

ARTWORK COMPONENT SIDE

revised 12/12/96

R36 R2 R3

PARTS LIST

P3000U 120VAC, 60Hz
DESIGNATOR VALUE ALL RESISTORS IN OHMS, 1/4W R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 R22 R23 R24 R25 R26 R27 R28 R29 R30 R31 R32 R33 R34 R35 R36 R37 R38 R39 R40 R41 R42 R43 R44 R45 R46 R47 R48 R49 R50 R51 R52 56.2k 1k 47k 47k 4.7k 1.07k 909 200, Trim Pot 1k 28k 10M 28k 470k 16 3.3M 4.7k 10k 100k 604k 45.3k 2.2M 100k 100k 10k Pot 820 2.2M 3.92k 3.92k 220 1k 1k 3.3M 1k 3k 6.8k 10k 15k 10k 15k 47k 47k 15k 10k 4.7k 4.7k 15k PART # RMP/4-5622 RM/4-102C RM/4-473C RM/4-473C RM/4-472C RM/4-1071C RM/4-9090C RVH-201 RM/4-102C RMP/4-2802 RMP/4-106C RM/4-2802C RM/4-474C RM/4-160C RM/4-335C RM/4-472C RM/4-103C RM/4-104C RM/4-6043C RM/4-4532C RM/4-225C RM/4-104C RM/4-104C RV-0818 RM/4-821C RM/4-225C RM/4-3160C RM/4-3160C RM/4-3921C RM/4-3921C RM/4-101C RM/4-101C RM/4-160C RM/4-471C RM/4-221C RM/4-102C RM/4-102C RM/4-335C RM/4-102C RM/4-302C RM/4-682C RM/4-103C RM/4-153C RM/4-103C RM/4-153C RM/4-473C RM/4-473C RM/4-153C RM/4-103C RM/4-472C RM/4-472C RM/4-153C DESIGNATOR VALUE R53 R54 R55 R56 R57 R58 R59 R61 R62 R63 R64 R123 R124 R127 R128 R129 R130 R131 R132 R133 R134 R135 R136 R138 R139 R140 R141 R159 R164 TS1 SW1 C1 C2 C3 C4 C5 C6 C7 C8 C9 C13 C14 C15 C16 C17 C18 C19 C20 2.2M 10k 100k 15k 10k 100k 10k 100k 2.2M 28k 100k 2k 820 1k 1k 3k 3k 3k 100 1k 200, Trim Pot 1k 220 Thermistor DPDT Switch 680pF, 100V 0.22F, 50V 6800F, 80V 0.22F, 250V 6800F, 80V 270pF, 50V 270pF, 50V 4.7pF, 100V 0.1F, 50V 470F, 50V 470F, 50V 0.1F, 50V 0.1F, 50V 0.1F, 50V 0.1F, 50V 0.1F, 50V 0.1F, 50V PART # RM/4-225C RM/4-103C RM/4-104C RM/4-153C RM/4-103C RM/4-104C RM/4-103C RM/4-104C RM/4-225C RM/4-2802C RM/4-104C RM/4-202C RM/4-821C RM/4-102C RM/4-101C RM/4-101C RM/4-102C RM/4-302C RM/4-302C RM/4-302C RM/4-101C RM/4-102C RVH-201 RM/4-101C RM/4-471C RM/4-102C RM/4-471C RM/4-471C RM/4-221C SS-1519-A SW-0280 CDS-681DBAA CYV-224 CERS-688D CY-224AC CERS-688D CDS-271CAAA CDS-271CAAA CDS-047DBAA CDS-104CCDB CER-477C-024 CER-477C-024 CDS-104CCDB CDS-104CCDB CDS-104CCDB CDS-104CCDB CDS-104CCDB CDS-104CCDB

TECHNICAL REFERENCE

FIELD SERVICE CONSIDERATIONS A primary focus during the design and development of the P1500 and P3000 was to ensure the dependability of the amplifiers. The use of lateral MOSFET output transistors and the low voltage transnova input stage combined with careful component selection for the circuit assembly made the reliability goals achievable. However, a parallel effort was also underaken to make sure any down time caused by an amplifier fault was minimized by making the amplifiers technician friendly. The modular construction allows for exchanging the entire operational portion of either channel quickly and easily. This section of the manual also contains circuit descriptions and block diagrams to assist technicians with component level repairs. THEORY AND OPERATION OF transnova The (TRANSconductance NOdal Voltage Amplifier) principle is based on our 1984 U.S. Patent 4,467,288. This patent describes the advantages of audio power amplifiers in which a MOSFET output stage is connected in a grounded source configuration. In this connection the output stage has its full voltage gain of typically 20dB (ten times), instead of the usual 1dB loss of voltage follower designs. It is an inevitable result of electrical physics that this output with gain inherently increases the power gain (for the same bandwidth) of the output stage by typically ten times over the conventional follower connection, using exactly the same MOSFET devices. The output stage is thus now ten times less wasteful of its incoming drive power. The driver stage can now be of a low voltage (18 volts) nature and be designed along the same principles always used in high quality preamplifiers: Class A operation, high linearity, and wide bandwidth. A topology utilizing an output stage with gain yields a much simpler, shorter total signal path than that of the usual high voltage driver designs. The number of serial stages is reduced from five or more, to only three. But all of the above does not make an amplifier transnova. The output stage is further refined into a trans-impedance stage (current-to-voltage converter), to achieve extremely short loop (fast) negative feedback. The output stage is driven cooperatively by a transconductance stage (voltage-to-current converter). The P1500 and P3000 are the most affordable amplifiers we have yet developed utilizing the basic transnova principle. And, although the measured specifications are very good, the numbers do not describe the realistic sound of the amplifiers.

CIRCUIT OPERATION transnova Implementation:
+18V Positive Output Q4, Q115 B+
Current Mirror Q104, Q105 Positive Input Buffer U1A Positive Buffer, DC Offset Integrator U2A, R11, C21, C22 CMRR Adjust R8
Positive Driver Cascode Q9, Q10
Drive Signal Local Feedback

Balanced Signal

Level Adjust R24 A, B

Differential Amp Q6, Q7

Feedback Network

Output

Negative Input Buffer U1B
Negative Buffer U2B Current Source Q103 Negative Driver Cascode Q11, Q12

Bias Adjust R136

Protection Switch, Soft Start Delay Q1, C29 18V

Negative Output Q5, Q116

The transistor Q1 is configured to operate as a switch which controls the current source, Q103, of the input differential amp, Q6 and Q7. When Q1 is off, the emitter voltage is low turning off Q103. Timing of the Soft Start function is controlled by the charging time of C29. Operation of Q1 is controlled by the THERMAL and SHORT protection circuits. U1A and U1B are buffer amps configured as unity gain followers which feed the resistive network comprised of R24A, R24B and R6 which attenuates the differential input at U2A and U2B. The output of U2A and U2B is taken to the inputs of the differential amp Q6 and Q7, U2A is also configured as a DC servo integrator to null the input offset currents. Transistor Q6 is the non-inverting input of the differential amp, taking the signal from U2A, the output is taken through the current mirror, Q105 and Q104 where the signal is inverted, then feeds the negative driver Q11 and Q12. Transistor Q7 is the inverting input of the differential amp, taking the signal from U2B. This output feeds the positive driver Q9 and Q10. The positive drivers Q9 and Q10, and the negative drivers Q11 and Q12 are cascoded stages which supply drive current and voltage to the output devices. Class AB bias current is controlled by R136. The network R1 and C1 form the short loop feedback for the output stage. Global feedback is supplied by the network R10 and C8.

Output Short Protection

Drive Signal Clip Detector U3A Comparator U3B Shut Down Switch Q5, Q4
Clip Detector U4A Short Latch U4C, CR14
Comparator U4A Output Signal

Short Indicator CR1

The Short detector monitors the Drive Signal and Output Signal levels and shuts down that channel when a shorted output condition is detected. Recovering from the Short protection requires turning the amplifier off to reset. The comparator U4B monitors the Drive Signal and goes low when the drive level is sufficient to clip the output stage. This drive signal clip status is connected to the input of U4A on pin 7, the Output Signal is connected to the input of U4A on pin 6. The output of U4A goes low when pin 7 is low and pin 6 is near zero. This condition, indicating high drive voltage and low output voltage, occurs only when the output is shorted. If the output of U4A is low for the time sufficient for C26 to charge, then U4C latches low activating the protection switch Q1 and lighting the indicator CR1. The output of U4C is held low by CR14 and will reset only after the power is turned off.

Thermal Protection

Soft Start Switch Q1

Temp TS1, R25

Comparator U5B

THERMAL Indicator CR2

The Thermal protection is activated, and shuts down audio operation when the amplifier heatsink reaches 90 C. The voltage divider R22 and R23 establishes the reference voltage on pin 5 of U5B. The control voltage on pin 4 is established by the voltage divider TS1 and R25. TS1 is a NTC (Negative Temperature Coefficient) thermistor mounted on the heatsink. As TS1 warms and the resistance falls, the voltage on pin 4 rises. When the voltage on pin 4 exceeds the voltage on pin 5, the output on pin 2 goes low activating the protection switch Q1 and lighting the THERMAL indicator.

Clipping Indicator

Drive Signal

Clipping Detector U5A

LED Driver U5C

CLIP Indicator CR3

The CLIP indicator is driven by the buffer U5C which is controlled by the comparator U5A. The voltage divider R56 and R57 establishes the reference voltage for the Clipping detector at pin 7 of U5A. The reference voltage scales the output of U5A to indicate when the Drive Signal at pin 6 demands in excess of the available voltage or current of the output stage. The output of U5A is stretched by R55 and C30 to prevent the CLIP indicator CR3 from flickering. Hysteresis is applied to the LED driver U5C by R53 to stabilize the output during input transitions.

Signal Present Indicator

Amplifier Output

Signal Detector U5D

LED Driver Q8

SIGNAL Indicator CR4

The SIGNAL indicator is controlled by the comparator U5D and the transistor Q8. The amplifier output is connected to the input pin 9. The voltage divider R58 and R59 scales the output voltage to change the comparator output state at an equivalent input voltage of 30mV, with the level controls set for full gain. The output at pin 14 controls the transistor Q8 to shunt across and turn off the LED CR4.

CALIBRATION

WARNING: Only a competent technician should attempt the following procedure. Bias: The bias control establishes the quiescent Class AB output current of the amplifier. The bias should not need readjustment from the factory setting; however, if the amplifier is repaired and output devices have been changed, or if the two channels of the amplifier do not run at the same temperature, calibrating the bias is necessary. Disconnect the power to the amplifier before removing the cover. To adjust the bias, disconnect the input and speakers and remove the jumper JW7. Connect an amp meter across the exposed pins. Adjust R136 to get a current reading of 100 mA for the P1500, 200 mA for the P3000. WARNING: Only a competent technician should attempt the following procedure. Common Mode Rejection:
The input common mode null is adjusted by the trim pot R8. The CMRR should be greater than 75dB below rated output. If the CMRR requires adjustment, feed the amplifier input with a common mode signal and adjust R8. Disconnect the power to the amplifier before removing the cover. Use a sinewave generator set to 1 volt output at 1kHz. Connect the generator signal output to the tip and ring of a 1/4" plug and ground to the sleeve. Plug this into the amplifier input. Connect an AC voltmeter to the amplifier output binding posts. Adjust R8 to give the lowest voltage output from the
amplifier. For a temporary adjustment when a signal generator and voltmeter are not available, use an FM tuner and tune it to an unused station as your signal source, and connect the output to the amplifier as described above. Connect the amplifier output to a small full range speaker. Turn the amplifier level controls full down and turn the amplifier on. Turn up the level control until you hear a signal through the speaker. Alternate adjusting R8 and the input control until you have the level control full. There should be a very low output from the amplifier if any is detected at all. MODULE REPLACEMENT
WARNING: Only a competent technician should attempt the following procedure.
The amplifier modules have been designed to eliminate the need for a special work place if a field exchange becomes necessary. All wire connections are made by quick connect terminals. The following tools are needed: Allen wrench, long reach 9/64 Allen wrench, long reach 7/64 Phillips screwdriver #1 tip Thin nose pliers Remove the Phillips head screws located on the rear panel, which secure the input jacks. Remove the two 9/64 Allen screws located between the heatsink fins along the top edge on each side, which fasten the cover. Three more screws hold the heatsink to the chassis; remove these screws and the level control knob. Unplug the gray cable which connects the mono input signal to Channel 2. Tilt the rear of the heatsink up and disengage the assembly from the chassis. Pull the heatsink away from the chassis to extend the wires. Disconnect the output wires from the binding posts and the power wires from the module. Remove the module from the heatsink. Install the new module on the heatsink. If it is Channel 1, set the Ground and Mono switches to the left (looking from the rear of the module) and reattach the gray mono cable. To reduce the chance of assembly errors in high stress situations, the main AC terminals are sized to accommodate only the correct wires. Reconnect the wires to the terminals as follows:

Wire Color Red Black Orange (two) White/Orange Blue (two) White/Blue
Function Output Output Ground High Voltage AC High Voltage Center Tap Low Voltage AC Low Voltage Center Tap
Terminal/Size Red Binding Post, 1/4" Black Binding Post, 1/4" AC1, AC2, 1/4" CT1, 1/4" AC3, AC4, 1/8" CT2, 1/8"

SERVICE POLICY

LIMITED WARRANTY
Rockford Corporation (Hafler Division) offers a limited warranty on Hafler products on the following terms: Length of Warranty 5 years on P1000, P1500, P3000, Pyears on P9505 and Pdays on all B-Stock (receipts are required) What is Covered This warranty applies only to products sold to the original owner (non-transferable). This only applies to units sold in the Continental United States. You are required to have a copy of the receipt stating the customer's name, dealer name, product purchased and date of purchase. Products found to be defective during the warranty period will be repaired or replaced (with product deemed to be equivalent) at Hafler's discretion. What is NOT Covered 1. Damage caused by accident, abuse, improper operations, water, theft 2. Service performed by anyone other than Hafler or an Authorized Hafler service center 3. Any product purchased outside the United States (please contact your local dealer) 4. Shipping charges to get the unit to Hafler 5. Any product which has had the serial number defaced, altered, or removed Limit on Implied Warranties Any implied warranties including warranties of fitness for use and merchantability are limited in duration to the period of the express warranty set forth above. Some states do not allow limitations on the length of an implied warranty, so this limitation may not apply. No person is authorized to assume for Hafler any other liability in connection with the sale of the product. How to obtain service or technical support Please call 1-800-669-9899 for Rockford/Hafler support. You must obtain an RA # (return authorization number) to return any products to Hafler. You are responsible for shipment of product to Hafler.
Rockford Corporation Hafler Division 2055 E. 5th Street Tempe, Arizona 85281
HAFLER A DIVISION OF ROCKFORD CORPROATION 546 SOUTH ROCKFORD DRIVE TEMPE, ARIZONA 85281 U.S.A. 480-967-3565 / 1-888-HAFLER1 WWW.HAFLER.COM

na l ip pi ng th er m a sh l or t
sh o th rt er m cl al ip pi ng sig na l

trans nova

A m p l i f i e r

channel 1

channel 2

FEATURES

CIRCUITRY
trans nova Amplifier Topology MOSFET Output Devices Electronic Fuse No Fan! Convection Cooled

DESCRIPTION

The transnova P1500 from Hafler! A company rich with heritage and experi-

MADE HE

ence. Building only the finest audio power amplifiers for professionals and audiophiles the world over since 1975. The P1500 transnova is perfect for many studio monitoring touring sound and fixed installations. Featuring Professor James Stricklands radical transnova topology (TRANSconductance NOdal Voltage Amplifier). This circuitry (patent #4467288) was first introduced in our 9500 and promptly blew away expensive esoteric amps taking audio technology up to a whole new level in performance. New LED indicators allow visually monitoring the operating status of each channel. The Thermal and Short indicators light when these protection circuits have been activated. The Clip indicator assists in protecting the speak-
CONTROLS & INDICATORS
3.5 Rack Mount (2-rack spaces) Stereo/Bridged Mono XLR or 1/4 Balanced Inputs Gold-Plated 5-Way Binding Posts Power Lamp, Signal, Clip, Thermal, Short LEDs 1dB Incremental Gain Controls Chassis/Float Ground Switch Serviceable Modules

WARRANTY

5 Year Warranty
ers by showing when the amp is overdriven and the output signal is distorted. The Signal indicator lights to show the presence of an audio signal.
Mono Output: Use CH 1 Input ONLY Set CH 2 Gain to Max Set Output Level with CH 1 Gain Control

XLR Connections

CAUTION
RISK OF ELECTRIC SHOCK DO NOT OPEN

Phone Connections

A Division of Rockford Corp. Tempe, AZ 85281 U.S.A. Made in the U.S.A.
Audio Ground Chass. Float
Mono 2-Ch 115V ~ 60Hz PV T4A
WARNING: DO NOT REMOVE COVER
CAUTION: For continued TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. protection from risk of fire, replace only with CH 2 Mono + C H 1 same type and rating of fuse. + 8 + 4-8

CH 1 (Mono)

SPECIFICATIONS
Power Rating... 75 Watts/channel @ Watts/channel @ Watts bridged/mono @ 8 Total Harmonic Distortion (THD).. <0.2% (20Hz-20kHz) Signal-to-Noise... 100dB A Weighted Full Power Bandwidth.. 0.15Hz to 300kHz (+0/3dB) Slew Rate... 100V/s CMRR (Common Mode Rejection Ratio)... 75dB at 1kHz Input Impedance... 47k per phase balanced Gain... +14dB min. / +29dB max. Input Sensitivity Range.. 437mV to 2.4V (@ 8) per phase balanced 330mV to 1.8V (@ 4) per phase balanced Damping Factor... 350 (to 1kHz) 150 (to 10kHz) 18 (to 100kHz) Power Consumption... 60W / 500mA @ 120VAC (idle power) 230W / 1.9A @ 120VAC (1/8 power 8) 325W / 2.70A @ 120VAC (max. power 8) Indicators.. Power, Signal, Clipping, Thermal, Short Dimensions.. 19W x 812D x 312H (2-rack spaces) (48.26cm x 12.59cm x 8.89cm) Net Weight.... 21.6 lbs. (9.98kg)
ARCHITECTS AND ENGINEERS SPECIFICATIONS
The audio power amplifier shall be solid state design employing 4 lateral power MOSFET output devices. It shall be constructed on a 16 gauge steel chassis utilizing convection cooling and be technician friendly using modular construction. Each channel shall be rated for a minimum of 75 watts into an 8 ohm load and 85 watts into a 4 ohm load with both channels driven. In bridged mono mode, the amplifier shall produce at least 170 watts into an 8 ohm load. A switch shall be provided for stereo or bridged mono operation and all power ratings shall be measured from 20Hz-20kHz with less than 0.2% THD. The amplifiers back panel shall provide Balanced inputs via combination XLR and 1/4 phone jacks. The back shall also utilize gold-plated 5-way binding posts for output connectors and a switch to isolate or connect the signal ground to the chassis ground. The amplifier shall include a 3-wire grounded AC line cord and UI power transformer operating on 120V/60Hz AC mains. An optional transformer for 230V 50-60Hz operation shall be available. The amplifiers front panel shall provide level controls with optional security covers. The front shall also incorporate a lighted main power switch and indicators for each amplifier channel. The indicators shall display signal present when 30mV of signal is detected, signal clipping when distortion rises above 1%, thermal protection should the heatsink temperature become excessive, and short circuit protection in case a problem on the speaker system arises. The amplifier shall fit standard 19 EIA rack mounting requirements utilizing 2rack spaces. The dimensions shall be 19 Wide, 812 Deep, 312 High, and be finished in black with a net weight of 21.6 pounds. It shall be a Hafler P1500.