CONTENTS

(click on a topic to view)
Congratulations Features and Specifications Mounting Mounting Wiring Wiring Functions Functions System Tuning System Tuning System Tuning
System Tuning System Tuning Frequency Distribution Frequency / Q Selection Code Frequency / Q Selection Code System One System Two System Three Troubleshooting Block Diagram Warranty
PAR Band Equalizer / Preamp OWNERS MANUAL POWER CLASS
Congratulations and thank you..
for choosing PrecisionPower audio epuipment. At PrecisionPower we proudly design, engineer and manufacture audio products at our facility in Phoenix, Arizona. Our award winning engineering team utilizes innovative technology to consistently deliver Absolutely State of the Art performance, sound quality, reliability, and value. This PrecisionPower product reflects our commitment to offer you unparalleled versatility and quality for years of dependable service and listening enjoyment.

S ervice

Do not attempt to service PrecisionPower products yourself. Performing exploratory surgery on your audio equipment yourself will void the warranty. Many parts of your PrecisionPower gear are custom built to our specifications. Our factory parts are not made available to anyone else nor are they for sale. Our goal is to make sure that your PrecisionPower product will always sound as good as the day it was purchased. Contact your authorized PrecisionPower dealer about obtaining any warranty service through PrecisionPower.(See Warranty insde back cover)
F O R YO U R R E C O R D S : M o d e l Serial Number Purchase Date

C aution!

The extended use of a high powered audio system may result in hearing loss or damage. While PrecisionPower systems are capable of "Concert Level" volumes with incredible accuracy, they are also designed for you to enjoy at more reasonable levels all of the sonic subtleties created by musicians. Please observe all local sound ordinances. BACK TO CONTENTS
FEATURES / SPECIFICATIONS 5 Band Parametric Equalizer Preamp Line Driver Choice of 16 Selectable Frequency/Q Settings for Each Band Front and Rear Outputs with Fader Control Dual Selectable Illumination Center-Detented Boost/Cut Controls 15 dB Boost/Cut for Each Band Defeat Switch Gold-plated RCA Input and Output Connectors PWM (Pulse Width Modulated) Power Supply Independent L & R Input Gain Adjustments Input Clip Indicator Designed and Handcrafted in the U.S.A. Specifications
Signal-to-Noise Ratio Total Harmonic Distortion (1 kHz, 1 VRMS) Boost/Cut Range Equalizer Center Frequencies and Q Values: Band Frequency Sub (30 - 66 Hz) Low (90 - 300 Hz) Low-Mid (430 - 900 Hz) High-Mid (950 Hz - 4.6 kHz) Treble (6 - 16 kHz) Maximum Input Voltage (Flat) Maximum Output (10 k Load) Frequency Response Supply Voltage Dimensions
110 dB 0.002% 15 dB Q Value 2.0 - 3.0 3.0 - 5.5 2.5 - 4.5 2.5 - 6.0 1.3 - 3.VRMS 10 VRMS 3 to 100 kHz 9 - 15 VDC 4.60" L 6.75" W 0.95" H

BACK TO CONTENTS

MOUNTING
Mounting To prevent damage to the PAR-245 while driving, mount it in a secure place. Choosing the appropriate location will depend upon your vehicle and the complexity of your system design. Typical mounting locations for your new PAR-245 would be in the dash or center console. Never mount the component in a location that would subject it to immersion or exposure to water.
Once a location has been chosen, securely mount the PAR-245 using the two supplied brackets. There are two different sets of brackets included with your PAR-245. One set is used to flush mount the PAR245, as shown above. The other set is used to surface mount, as shown on the next page. The brackets are connected to the equalizer/ preamp by two 6-32 x 1/4" socket head cap screws. We have made the brackets adjustable to compensate for the uniqueness of each vehicle. Be Careful! Inspect the area underneath to be sure you are not drilling into wires, etc. that could be damaged by the drill bit or screws.

R L R L R L

Dimensions 6.75"W 4.60" L 0.95"H

+ + + + +

WIRING
eject BASS VOLUME LEFT TREBLE TRACK RIGHT FOWARD REVERSE

MAR KET ING DPT

BALANCE

Volume

Power In-Clip

Defeat

Low-Mid

High-Mid

Treble

PAR-245

NOTE Before beginning, disconnect the negative (-) terminal of the battery prior to working on the positive (+) terminal to prevent a short to ground. This is important, unless you want to spend the rest of your life with a nickname like "Sparky," or "Smokey." Reconnect the negative terminal only after all connections have been made.

WIRING The next step is to connect the Power, Ground, and Remote wires to your PAR-245. The power wire should run from the mounting location through the vehicle to the battery or power distribution block. Avoid sharp corners, creases, and sharp body parts. When passing through any metal wall (i.e. firewall etc.), a grommet must be used to prevent the wire from chaffing and shorting to ground. The ground wire should be of the same gauge as the power wire. As a rule of thumb, use as short a length of wire as possible. Find a location near the equalizer that is metal (the floor is ideal) and clean an area about the size of a quarter to bare metal. Drill a pilot hole in the middle of this area. Be Careful! Inspect the area underneath to be sure you are not drilling into wires, brake or fuel lines, etc. Terminate the wire with a ring connector and attach it to the bare metal using a #8 sheet metal screw and washer (not supplied). We suggest crimping and/or soldering this connection. After the connection is complete, coat the area with silicone or some similar material to Powerlock prevent rust from developing. Finally, the remote wire needs to Remote Power Ground run to the power antenna (or amplifier remote) lead of the head unit. This wire supplies a 12 volt signal to the PAR-245 when the T/O B+ main system is activated. Once you have routed the power, ground, and remote wires through the vehicle, it is time to connect the wires to the PAR-245. Be sure that you have not reconnected the ground cable to the negative post of the battery. Cut off excess wire and, using wire strippers, strip the power, ground and remote cables about 1/8 inch. Locate the power, ground, and remote Powerlock connector (supplied). On the top of the connector are three slotted screws. With a small flat-bladed screwdriver, loosen the screws before attempting to insert the cables. After you have inserted the stripped end of each cable into the connector, secure it by tightening the associated screw. Check that each connection is tight. If the wires are secure, the connector may be plugged into the PAR-245. 5

FUNCTIONS

1. Input Gold plated RCA inputs. Plug in the RCA cables from the source unit here. 2. Rear Output Gold plated RCA outputs. Plug in the RCA cables to your rear channel amplifier here. 3. Front Output Gold plated RCA outputs. Plug in the RCA cables to your front channel amplifier here. 4. LED Select Push this switch IN for Red Illumination, Leave it OUT for Green. 5. Power After connecting the Power, Ground and Remote wires, plug in the PowerLock connector here. 6, 7. Left and Right Input Sensitivity Sets Left and Right input gain to match the output level from the source unit. (See Page 8) 8. Frequency Adjust Set the Frequency/Q combination for each band with these switches. See the Frequency/Q Selection Codes on pages 14 and 15.

1. Power LED Red light indicates power on. 2. Input Clip Input-Clip indicator lights when the PAR-245 is overdriven. With the source unit at 3/4 full volume, adjust the input sensitivity so that the light blinks only on very loud material. 3. Volume Leave the source unit at 3/4 full volume, and use this control as the Master volume control. 4. Fader Controls the output level to Front and Rear. 5. Defeat Switch With the switch in the OUT position, the equalizer controls are bypassed. Use this switch to compare the sound with and without equalization. 6. Sub Subwoofer band (30 Hz - 66 Hz) Boost/Cut control. 7. Low Low band (90 Hz - 300 Hz) Boost/Cut control. 8. Low-Mid Low Midrange band (430 Hz - 900 Hz) Boost/Cut control. 9. High-Mid High Midrange band (960 Hz - 4.6 kHz) Boost/Cut control. 10. Treble Treble band (6 kHz - 16 kHz) Boost/Cut control.
SYSTEM TUNING System Gain Adjustment In order to achieve maximum signal-to-noise performance from a high quality auto stereo system, it is desirable to use high signal levels wherever possible in the interconnect cables. High signal levels will reduce the effect of induced noise. The peak level of an audio signal is usually determined by the clipping level of electronic components. The following procedure should be used as a guide before the system installation is completed. Adjustment of source unit output and PAR-245 input: 1. Turn PAR-245 volume control fully counterclockwise. 2. Turn source unit volume 1/2 to 3/4 of maximum. 3. Adjust all PAR-245 input gains fully counterclockwise. 4. Play a CD or cassette. A loud music selection is desired. 5. Adjust the left input gain control clockwise until the input clip LED lights. Then adjust the control counterclockwise slightly until the LED doesn't light. This setting will minimize system background noise and prevents overloading the PAR-245. 6. Repeat Step 5 for the right input gain control. There are separate left and right gain adjustments for each input which allows left/right balance adjustments. Adjusting amplifier input gains: 1. Adjust gains to minimum sensitivity (fully counterclockwise on the gain control of a PPI amplifier.) 2. Turn the volume knob on the PAR-245 to the 3 o'clock position. 3. Increase the gain on the amplifier until the onset of audible distortion. 4. Repeat step 3 for any remaining amplifiers in the system. NOTE: In many multi-amplifier systems, the gain of some amplifiers may need to be further decreased to achieve tonal balance.

SYSTEM TUNING Parametric Operation The PAR-245 Equalizer/Preamp puts an incredible amount of control at your fingertips. Correctly adjusted, it can solve many of the problems you will encounter along your road to perfect sound. By following these guidelines, you will avoid common pitfalls in system tuning and get your sound quickly dialed in. We recommend that you use a Real Time Analyzer (RTA) to speed things up, but it is possible to tune your system without it. It is important to understand what your equalizer actually controls to be able to use it effectively. On the face of the PAR-245 are five Boost/ Cut controls each corresponding to a range of frequencies. On the top are the five sets of Frequency/Q Selection switches to adjust for each Boost/Cut control on the front of the PAR-245 (See the chart on pages 14 and 15 for Frequency/Q selection.) Q is an indication of how wide or narrow the adjusted bandwidth is. A low Q will affect a wide range of frequencies around the selected center frequency resulting in a gently curved shape, while a high Q affects a narrow band resulting in a peaked shape as shown below.
SYSTEM TUNING NOTE: If you are using the PAR-245 as well as another equalizer (like the DEQ-230 or PMQ-210) Go to step 11. 1) The first step is to locate a suitable source of pink noise." A good choice would be the current IASCA competition reference disc. Also, some RTAs have a built-in pink noise source. Ideally, the pink noise should play through your head unit, allowing you to compensate for any frequency response changes caused by it, or anything else, before the amplifiers. 2) Next, place the microphone from the RTA in the driver's seat at approximately head level. Initially, set the analyzer to read at 3dB per step, and set the speed of the RTAs readout to medium. Turn on your system and start the pink noise. Raise or lower the volume until you can see all (or most) of your frequency response on the RTA scale (a little above or below is OK). Make sure all of the equalizer's frequency controls are centered and look at the RTA screen. 3) You are trying to achieve a target frequency response, or "curve" that reflects your preference. You might think that a perfectly straight line would be best, but it really doesn't sound very good. Instead, shoot for a curve that starts about 9 dB up at the low frequencies (25 Hz to about 100 Hz) dropping gently to 0 dB in the midrange (250 Hz to 3 kHz), then dropping gently to -9 dB at 16 kHz and 20 kHz.

RTA 12

THIRD OCTAVE REAL TIME SPECTRUM ANALYZER

630 800

1K 1.25K 1.6K 2K 2.5K 3.15K 4K
5K 6.3K 8K 10K 12.5K 16K 20K
SYSTEM TUNING 4) If electronic crossovers are used, any large frequency sections corresponding to your crossover points that are low or high should be brought in line using crossover level controls or amp gain adjustments rather than the equalizer. 5) To begin, you will probably see several peaks and dips in your RTA curve. Find the lowest offending frequency, and choose the appropriate frequency range control on the top of the PAR-245. Reading from left to right when looking at the face of your new PAR-245, the following are the frequency ranges; BAND SUB LOW LOW-MID HIGH-MID TREBLE FREQUENCY 30 Hz - 66 Hz 90 Hz - 300 Hz 430 Hz - 900 Hz 960 Hz - 4.6 kHz 6 kHz - 16 kHz
6) Looking at the Frequency/Q selection chart for the selected band, set the switches on top of the PAR-245 to the frequency that is closest to the peak (or dip) and has the highest Q. Turn the Boost/Cut control counterclockwise until the peak (clockwise to correct a dip) comes in line with your desired curve. (See pages 14 & 15.) 7) When the center frequency of the original peak (or dip) has been brought down to where you want it, you may see that surrounding frequencies are still higher than you want them. Select the closest frequency to the original peak (or dip) that has a lower Q, and see if you now have a smooth line through that band. You may have to try a number of Frequency/Q combinations to get the best results.
SYSTEM TUNING 8) Move to the next peak or dip, and repeat the process until you run out of frequencies to adjust. Try to remove the peaks before filling the dips. Periodically, while you are making adjustments, compare the new curve you are making to the system in an unequalized state by using the defeat switch on the front face plate of the PAR-245.
9) Play your favorite music. If the sound isn't what you're looking for, go back to the pink noise and smoothly adjust your curve for more bass, less midrange or whatever you think will correct the sound. Remember that this is your system - don't let someone else tell you how it should sound! When the sound is close to what you want, move to step 10. 10) Play several different music tracks. If you hear an instrument, voice, or other sound that is too loud, find the sound on the chart on page 14. This will give you clues as to what frequencies need to be adjusted on the PAR-245. (If you have already tuned using an RTA, this step is icing on the cake.) Make one adjustment at a time, giving yourself time to notice the changes. 11) If you are using another equalizer, like the DEQ-230 or the PMQ-210, as well as the PAR-245, you should first tune the system using the other equalizer. This leaves the PAR-245 free to make wider frequency adjustments, compensating for equalization differences between Radio, Cassette, Video and Digital sources, like DAT and CD. Select Frequency/Q combinations for each band near the center of the frequency range, with a low Q.

FREQUENCY DISTRIBUTION

FUNDAMENTAL NOTE HARMONIC OR OVERTONE
electric guitar acoustic guitar violin cello double bass trumpet french horn trombone tuba soprano sax tenor sax clarinet oboe flute piano synthesizer female vocal range male vocal range tympani kick drum tom drum snare drum cymbals electric bass

1.6 3.2 6.4 12.8

FREQUENCY/Q SELECTION CODES
PAR-245 Frequency Controls Use a small flat-bladed screwdriver to change the Frequency/Q selection switches to the settings following the System Tuning guidelines.

SYSTEM ONE

Source Unit

Input L

Rear Outp ut L

In pu t Se

Powe In-Cl
Pre PAR- cisionPowe 245 r

ty vi ti nsi

Front Output L

LED Sele

Frequenc y Adju st

Low-M id

Low High-Mid

Fade r Defe

at Sub Low Low -Mid High -Mid

Made in USA

1.9 5K Hz -4. 5Kh z

PAR-245 Preamp/Equalizer

940 Hz -1. 25K Hz 330 Hz -1KH z

14K Hz -23.3 7K Hz

9.3 7K Hz -15.7 5K Hz

4K Hz -9. 37K Hz

Bo ost

+12 db +12 db -12db

160 Hz -550H z

80H z-2 60H z

40H z-1 30H z

20H z-7 0H z

ut attenua

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tion B in

ster eo mon out oin

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PMQ-210 Ten Band Parametric EQ

344 752

De fea t

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onic Electr

+12 db

over Cross in USA Made

er Pow ision 10

Po w er

Ran ge

1.77 K

Twe ete r

Rea r Fill

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10 Band

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220 600

Fro nt

Pre cis ion

com bine d inpu ts in

R R rea

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und Gro Remote r Powe

Le ft Ph as e

r we Po

er onPow Precisi C-221 PS

Po we r

Pas s Ga in

Sub wo ofe r

in outNon-inver Inver
ted ted / Acti / ByP ve ass
FRX-456 Crossover PSC-221 Phase Shift Control

High Pass Frequencies

Tweeter

POWERCLASS Amplifier

Crossover off Mid Range Frequencies

Mid Range

Crossover off Low Pass Frequencies

Subwoofer

Crossover off

Rig ht

Ph as e

Son ic

SYSTEM TWO

Vol ume

Powe In-Cl r
Fade r Defe at Sub Low Low -Mid High -Mid

Treb le

Front Output Rear Output

Pre cis

r we Po ion
PSC-221 Phase Shift Control

Passive Crossover

MidRange
POWERCLASS Amplifier High Pass at 90 Hz
POWERCLASS Amplifier Low Pass at 90 Hz

SYSTEM THREE

3.2 KH z

+12d b

zer e Equali Octav

12. 8 KH z

in USA

8 KH z

+12d b +12d b

4 KH z

2 KH z

5 KH z

1 KH z

31. 5 Hz

stereo mon out o in

DEQ-230 Third Octave EQ

De feat

Power ision

DEQ-230

In pu t Se ty vi ti nsi

POWERCLASS Two ChannelAmplifier Low Pass

Pass ert L By L Inv

Pass ert R By R Inv

Low Pass Low Pass

Mid Bass
Passive Crossover High Pass
POWERCLASS Four Channel Amplifier
POWERCLASS Two ChannelAmplifier

TROUBLE SHOOTING

NO SOUND

Is the LED lit?

YES Check Input cables for signal by connecting them to the next component in line. NO Check Power and Remote turn-on wire for voltage. Make sure Ground wire is secure.
ANY SOUND NOW? YES NO Problem is in the Equalizer. See your Problem is elsewhere in the system. local Authorized PrecisionPower Dealer Check head unit and amplifiers. or call1-800-62POWER. SOUND IN ONE CHANNEL ONLY Check Balance control. Reverse left and right RCA outputs.
SOUND IS NOW IN OPPOSITE CHANNEL Reverse RCA inputs. SAME CHANNEL Problem is in the amplifier, speakers or associated wiring of the silent channel.
SOUND IS NOW IN OPPOSITE CHANNEL Reverse RCAs at head unit. SAME CHANNEL Problem is in the Equalizer. See your local Authorized PrecisionPower Dealer or call 1-800-62POWER. SOUND IS NOW IN SAME CHANNEL Problem is in the RCA cables.

OPPOSITE CHANNEL Problem is in the head unit.

BLOCK DIAGRAM

WA R R A N T Y Three-Year Limited U.S.A. Warranty
This warranty gives you specific legal rights, and you may also have other rights which vary from state to state. PrecisionPower warrants its products to be free from defects in materials and workmanship under normal use and service for a period of three (3) years from the date of original purchase when the unit is installed by an Authorized Dealer. Non-Authorized Dealer installed products carry a one (1) year parts and ninety (90) days labor limited warranty. The extent and conditions of Limited Warranty are as follows: 1. Authorized Dealer Installed Products: PrecisionPower will either repair or replace at no charge, to the original purchaser, any unit which PrecisionPowers examination discloses to be defective and under warranty, provided the defect occurs within three (3) years from the date of original purchase when the unit is installed by an Authorized Dealer and the product is returned immediately to PrecisionPower. This warranty is not transferable. 2. Non-Authorized Dealer Installed Products: PrecisionPower will either repair or replace at no charge, to the original purchaser, any unit which PrecisionPowers examination discloses to be defective and under warranty, provided the defect occurs within ninety (90) days from the date of purchase and the product is returned immediately to PrecisionPower. Warranty claims beyond ninety (90) days for Non-Authorized Dealer Installed Products will be for parts only and will extend for one (1) year from the date of purchase. This warranty is not transferable. 3. The date of purchase and proof of Authorized Dealer Installation of a PrecisionPower product must be established by an original sales receipt which must accompany the article being returned for warranty work. 4. This warranty shall NOT apply to any PrecisionPower product found to have the original factory serial number removed or defaced. All products received (by PrecisionPower) for in warranty or out of warranty repair, with their original serial numbers removed or defaced, will NOT be repaired and will be returned to sender, freight collect. Refer to original packaging for the serial number of your component speakers. 5. The provisions of this warranty shall not apply to any PrecisionPower product used for a purpose for which it is not designed, which has been repaired or altered in any way, or which has been connected, installed, or adjusted other than in accordance with the instructions furnished in PrecisionPowers owners manual. Nor shall this warranty apply to any part which has been subject to misuse, neglect, or accident. 6. PrecisionPower does not authorize any other persons to assume any other liability in connection with its products. THIS WARRANTY IS THE ONLY EXPRESS WARRANTY MADE BY PRECISIONPOWER APPLICABLE TO ITS PRODUCTS. ANY IMPLIED WARRANTY OR MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE APPLICABLE TO PRECISIONPOWER PRODUCTS IS LIMITED IN DURATION TO THE DURATION OF THIS LIMITED WARRANTY. PRECISIONPOWER SHALL NOT BE LIABLE FOR THE INCIDENTAL, CONSEQUENTIAL, OR COMMERCIAL DAMAGES RESULTING FROM THE BREACH OF THIS WRITTEN WARRANTY. Some states or provinces do not allow the exclusion or limitation of incidental or consequential damages or limitations on how long an implied warranty lasts; so the above limitations or exclusions may not apply to you. 7. Your product will be serviced on an in-warranty basis within the warranty period for the correction of warranted defects. If improper operation of your PrecisionPower product should occur, contact your Authorized Dealer for assistance with the return and factory repair of your PrecisionPower product. If an Authorized Dealer is not available, return the unit including your name, telephone number, return address, a copy of your sales receipt, and a description of the problem to: PrecisionPower,Inc. Service Department 4829 S. 38th Street Phoenix, AZ 85040-2964 TO RETURN PRECISIONPOWER PRODUCTS OUT OF WARRANTY: Return the unit, postage prepaid, in the original protective carton. Please include a description of the problem and, if desired, a request for an estimate of repair costs. Unless a request for an estimate is included, the unit will be repaired as necessary. Please contact PrecisionPower Customer Service at 1800-62-POWER for questions concerning out of warranty repair charges. Repaired unit will be returned with an itemized statement, C.O.D.

CONTENTS

(click on a topic to view)
Congratulations Features and Specifications Operation Installation Wiring
Wiring Inputs / Outputs Block Diagram Troubleshooting Warranty
DAC348 Digital to Analog Converter OWNERS MANUAL POWER CLASS
Congratulations and thank you..
for choosing PrecisionPower audio epuipment. At PrecisionPower we proudly design, engineer and manufacture audio products at our facility in Phoenix, Arizona. Our award winning engineering team utilizes innovative technology to consistently deliver Absolutely State of the Art performance, sound quality, reliability, and value. This PrecisionPower product reflects our commitment to offer you unparalleled versatility and quality for years of dependable service and listening enjoyment.

S ervice

Do not attempt to service PrecisionPower products yourself. Performing exploratory surgery on your audio equipment yourself will void the warranty. Many parts of your PrecisionPower gear are custom built to our specifications. Our factory parts are not made available to anyone else nor are they for sale. Our goal is to make sure that your PrecisionPower product will always sound as good as the day it was purchased. Contact your authorized PrecisionPower dealer about obtaining any warranty service through PrecisionPower.(See Warranty insde back cover)
F O R YO U R R E C O R D S : M o d e l Serial Number Purchase Date

C aution!

The extended use of a high powered audio system may result in hearing loss or damage. While PrecisionPower systems are capable of "Concert Level" volumes with incredible accuracy, they are also designed for you to enjoy at more reasonable levels all of the sonic subtleties created by musicians. Please observe all local sound ordinances. BACK TO CONTENTS
FEATURES / SPECIFICATIONS
PWM Power Supply True 24-bit Digital Signal Processing Class "A" Analog Stages Direct-Coupled Analog Circuitry Dual RCA Outputs Analog Pass-Through Smart Input Selection Gold Plated RCA Input and Output Connectors Optical and Coax Digital Inputs Completely Designed And Handcrafted In The USA Three Year Warranty when installed by an Authorized PrecisionPower Dealer
Specifications Oversampling Frequency Response: Total Harmonic Distortion: Channel Separation Digital Inputs : Supply Voltage Maximum Output (10k Load) Output Impedance Dimensions 8 fs 5 Hz - 20 kHz 0.2dB <0.01 % >90dB Coaxial and Toslink Optical 11 - 15 volts 4 VRMS 30 ohms 5.125" W 13.11" L 1.750" H

BACK TO CONTENTS

OPERATION
PrecisionPower's DAC-348 processes the digital signal directly from the CD player, changer or other digital source. All digital to analog conversion as well as the subsequent filtering and analog treatment of the signal by the stock source unit is replaced by the superior digital signal processing, digital to analog conversion and fully discrete Class A analog circuitry of the DAC-348. Because most digital head units are in fact combined with analog AM/ FM and Cassette players, PrecisionPower engineers have included analog inputs as well as a Smart Input Selector that monitors the Digital inputs and automatically chooses the appropriate source. To take advantage of this feature you must connect both the Digital (coaxial or optical) and the analog (RCA) outputs to the DAC-348.
As you have now bypassed the stock circuitry, the volume control on your head unit will no longer affect the digital signal. You will need to use a preamp or line driver (such as the PAR-245) as the master volume control for your system. Refer to the diagram below.

System Diagram

Source Unit
eject BASS VOLUME LEFT TREBLE TRACK RIGHT FOWARD REVERSE

MAR KET ING DPT

Analog RCA

BALANCE

Digital Coaxial RCA Or Optical
DAC-348 Digital to Analog Convertor

Input L

Rear Outp ut L

In pu t Se

Powe r In-Cl ip
Precis PAR-24 ionPowe r 5

vi ti nsi

Low Low-M id High-Mid

Front Output L

LED Sele

Frequen

cy Adju

Fad er Defe

Treble

at Sub Low Low

Made in USA

PAR-245 Preamp/Equalizer

-Mid High -Mid Treb le

PAR -245

Front Output

Rear Output

POWERCLASS Amplifier

INSTALLATION / MOUNTING

Mounting To prevent damage to the DAC while driving, mount it in a secure place. Choosing the appropriate location will depend upon your vehicle and the complexity of your system design. Keep in mind that the output of the DAC-348 must go to a preamp to control the volume of the digital source. To keep the signal path as short as possible, the DAC-348 should be mounted as close to the head unit and preamp as possible. Never mount the DAC-348 in a location that would subject it to immersion or exposure to water. Once a location has been chosen, securely mount the DAC-348 with four mounting screws. Be Careful! Inspect the area underneath to be sure you are not drilling into wires, brake or fuel lines, etc. that could be damaged by the drill bit or screws.

Dimensions

13.113
5.125" W 13.11" L 1.750" H

12.656

WIRING
Factory Ground wire may need to be replaced if it is frayed or broken.
Positive Battery Terminal
Fuse must be installed within 18" of battery Run signal cables (RCAs) and remote turn-on lead down the opposite side of the vehicle from the power wire to avoid radiated noise.
Drill a hole in the firewall and use a rubber grommet to keep wire from shorting. Mount the DAC-348 near the front of the vehicle to minimize signal path lengths
Power distribution block. Run the cables under the carpet near the side of the vehicle. Be careful not to drill or screw into the wires when you replace the trim.
Avoid sharp edges that could chafe through the insulation.
For systems over 300 watts, add a ground cable from the amp to the battery.
Attach Ground Wires firmly to solid metal.
NOTE Before beginning, disconnect the negative (-) terminal of the battery prior to working on the positive (+) terminal to prevent a short to ground. This is important, unless you want to spend the rest of your life with a nickname like "Sparky," or "Smokey." Reconnect the negative terminal only after all connections have been made.
WIRING The next step is to connect the Power, Ground, and Remote wires to your DAC-348. The power wire should run from the mounting location through the vehicle to the battery or power distribution block. Avoid sharp corners, creases, and sharp body parts. When passing through any metal wall (i.e. firewall etc.), a grommet must be used to prevent the wire from chaffing and shorting to ground. The ground wire should be of the same gauge as the power wire. As a rule of thumb, use as short a length of wire as possible. Find a location near the DAC that is metal (the floor is ideal) and clean an area about the size of a quarter to bare metal. Drill a pilot hole in the middle of this area. Be Careful! Inspect the area underneath to be sure you are not drilling into wires, brake or fuel lines, etc. Terminate the wire with a ring connector and attach it to the bare metal using a #8 sheet metal screw and washer (not supplied). We suggest crimping and/or soldering this connection. After the connection is complete, coat the area with silicone or some similar material to Powerlock prevent rust from developing. Finally, the remote wire needs to run to the power antenna (or amplifier remote) lead of the head unit. This wire supplies a 12 volt signal to the DAC-348 when the T/O B+ main system is activated. Once you have routed the power, ground, and remote wires through the vehicle, it is time to connect the wires to the DAC-348. Be sure that you have not reconnected the ground cable to the negative post of the battery. Cut off excess wire and, using wire strippers, strip the power, ground and remote cables about 1/8 inch. Locate the power, ground, and remote Powerlock connector (supplied). On the top of the connector are three slotted screws. With a small flat-bladed screwdriver, loosen the screws before attempting to insert the cables. After you have inserted the stripped end of each cable into the connector, secure it by tightening the associated screw. Check that each connection is tight. If the wires are secure, the connector may be plugged into the DAC-348. 5

INPUTS / OUTPUTS

1 Connect the Digital output from your source to the appropriate
Digital Input connector (coax or Toslink optical).
After connecting Power, Ground, and Remote wires, plug in the Powerlock connector here. 5 amp Fuse Parallel Analog Outputs to Preamp. Analog Inputs from source unit. Sync LED - Red light indicates digital signal being processed. Power LED - Red light indicates power on.

3 A B C D

Analog Outputs

Analog Inputs

r nc we Sy Po

DC Servo

Coaxial Input
8x Oversampling, Digital Filtering, and De-emphasis I to V Conversion AMP Low Pass Filter L
Burr-Brown D to A Converter
Decoder I to V Conversion AMP Low Pass Filter

Smart Input Selector

BLOCK DIAGRAM

Toslink Input

TROUBLE SHOOTING
NO SOUND IS THE POWER LED LIT? YES NO Check Power and Remote turn-on wire for voltage. Make sure Ground wire is secure. IS THE SYNC LED LIT? YES Unplug the Digital Input cable from the DAC-348 NO Bypass the DAC-348 by connecting the analog RCA input cables directly to the Preamp (PAR-245). NO Problem is elsewhere in the system. Check head unit and amplifiers.
ANY SOUND NOW? YES Problem is in the DAC. See your local Authorized PrecisionPower Dealer or call 1-800-62POWER.
ANY SOUND NOW? YES Problem is in the DAC. See your local Authorized PrecisionPower Dealer or call 1-800-62POWER. SOUND IN ONE CHANNEL ONLY IS THE SYNC LED LIT? YES NO Check Balance control. Reverse left and right RCA inputs SOUND IS NOW IN SAME CHANNEL Problem is in the RCA cables OPPOSITE CHANNEL Problem is in the head unit or RCA cables NO Problem is elsewhere in the system. Check head unit and amplifiers.
Reverse left and right RCA outputs SOUND IS NOW IN SAME CHANNEL Problem is downstream of the DAC-348
OPPOSITE CHANNEL Problem is in the DAC. See your local Authorized PrecisionPower Dealer or call 1-800-62POWER.
WA R R A N T Y Three-Year Limited U.S.A. Warranty
This warranty gives you specific legal rights, and you may also have other rights which vary from state to state. PrecisionPower warrants its products to be free from defects in materials and workmanship under normal use and service for a period of three (3) years from the date of original purchase when the unit is installed by an Authorized Dealer. Non-Authorized Dealer installed products carry a one (1) year parts and ninety (90) days labor limited warranty. The extent and conditions of Limited Warranty are as follows: 1. Authorized Dealer Installed Products: PrecisionPower will either repair or replace at no charge, to the original purchaser, any unit which PrecisionPowers examination discloses to be defective and under warranty, provided the defect occurs within three (3) years from the date of original purchase when the unit is installed by an Authorized Dealer and the product is returned immediately to PrecisionPower. This warranty is not transferable. 2. Non-Authorized Dealer Installed Products: PrecisionPower will either repair or replace at no charge, to the original purchaser, any unit which PrecisionPowers examination discloses to be defective and under warranty, provided the defect occurs within ninety (90) days from the date of purchase and the product is returned immediately to PrecisionPower. Warranty claims beyond ninety (90) days for Non-Authorized Dealer Installed Products will be for parts only and will extend for one (1) year from the date of purchase. This warranty is not transferable. 3. The date of purchase and proof of Authorized Dealer Installation of a PrecisionPower product must be established by an original sales receipt which must accompany the article being returned for warranty work. 4. This warranty shall NOT apply to any PrecisionPower product found to have the original factory serial number removed or defaced. All products received (by PrecisionPower) for in warranty or out of warranty repair, with their original serial numbers removed or defaced, will NOT be repaired and will be returned to sender, freight collect. Refer to original packaging for the serial number of your component speakers. 5. The provisions of this warranty shall not apply to any PrecisionPower product used for a purpose for which it is not designed, which has been repaired or altered in any way, or which has been connected, installed, or adjusted other than in accordance with the instructions furnished in PrecisionPowers owners manual. Nor shall this warranty apply to any part which has been subject to misuse, neglect, or accident. 6. PrecisionPower does not authorize any other persons to assume any other liability in connection with its products. THIS WARRANTY IS THE ONLY EXPRESS WARRANTY MADE BY PRECISIONPOWER APPLICABLE TO ITS PRODUCTS. ANY IMPLIED WARRANTY OR MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE APPLICABLE TO PRECISIONPOWER PRODUCTS IS LIMITED IN DURATION TO THE DURATION OF THIS LIMITED WARRANTY. PRECISIONPOWER SHALL NOT BE LIABLE FOR THE INCIDENTAL, CONSEQUENTIAL, OR COMMERCIAL DAMAGES RESULTING FROM THE BREACH OF THIS WRITTEN WARRANTY. Some states or provinces do not allow the exclusion or limitation of incidental or consequential damages or limitations on how long an implied warranty lasts; so the above limitations or exclusions may not apply to you. 7. Your product will be serviced on an in-warranty basis within the warranty period for the correction of warranted defects. If improper operation of your PrecisionPower product should occur, contact your Authorized Dealer for assistance with the return and factory repair of your PrecisionPower product. If an Authorized Dealer is not available, return the unit including your name, telephone number, return address, a copy of your sales receipt, and a description of the problem to: PrecisionPower,Inc. Service Department 4829 S. 38th Street Phoenix, AZ 85040-2964 TO RETURN PRECISIONPOWER PRODUCTS OUT OF WARRANTY: Return the unit, postage prepaid, in the original protective carton. Please include a description of the problem and, if desired, a request for an estimate of repair costs. Unless a request for an estimate is included, the unit will be repaired as necessary. Please contact PrecisionPower Customer Service at 1800-62-POWER for questions concerning out of warranty repair charges. Repaired unit will be returned with an itemized statement, C.O.D.