Harman JBL MA704 Manual Download Page 12

UПL 

b

y

HARMAN 

Selecting the subwoofer phase 

You сап choose а subwoofer phase output of 0

° 

or 180

°

. То check your sub's phase, play music with lots of bass and listen as another person 

slowly flips the 0/180 degree phase switch back and forth. The correct setting is the one that gives you more bass. lf you don't detect any real 

difference, leave the switch in the О setting. 

PHASE 

l

111111111  11

_J 

L_ 

0

° 

180

°

Boosting the bass 

Turn the dial clockwise to increase the bass output from О dB to +9 dB. 

BASS BOOST 

OdB  +9dB 

СНАРТЕR 4:TROUBLESHOOТING 
PROBLEM: No audio and P0WER INDICAT0R is off. 

CAUSE and S0LUTION: No voltage at ВАТТ+ and/or REM terminals, or bad or по ground connection. Check voltages at amplifier terminals 

with V0M. 

PROBLEM: No audio and РRОПСТ INDICAT0R flashes every 4 seconds. 

CAUSE and S0LUTION: DC voltage оп amplifier output. Amplifier may need service; see enclosed warranty card for service information. 

PROBLEM: No audio and РRОПСТ INDICAT0R is оп. 

CAUSE and S0LUTION: Amplifier is overheated. Make sure amplifier cooling is not Ыocked at mounting location. Verify that speaker-system 

impedance is within specified limits. 0r, there may Ье voltage greater than 16V (or less than 8.5V) оп ВАТТ+ connection. Check vehicle 

charging system. 

PROBLEM: No audio and РRОПСТ and P0WER INDICAT0RS flash. 

CAUSE and S0LUTION: Voltage less than 9V оп ВАТТ+ connection. Check vehicle charging system. 

PROBLEM: Distorted audio. 

CAUSE and S0LUTION: Gain is not set properly. Check INPUT LEVEL setting. Check speaker wires for shorts or grounds. Amplifier or source 

unit may Ье defective. 

Summary of Contents for JBL MA704

Page 1: ...JBL Marine 704 4505 AMPLIFIERS MANUAL yHARMAN...

Page 2: ...er important documents in order to expedite warranty service if needed ABOUTTHE MANUAL This manual describes general installation guidelines and operation instructions However please note that proper...

Page 3: ...1 Power indicator 2 Protect indicator 3 Speaker output connectors 4 Fuses 5 Power input connectors 6 Front and rear inputs and outputs RCA 7 lnput level 8 Crossover filter selectors 9 Gain 1 Crossover...

Page 4: ...U L by HARMAN R 1 PICTORIAL INDEX OF INPUT CONNEC IONS MARINE Amplifier top panel MARINE Amplifier front panel MARINE Amplifier back panel PREO J REAR FRONT...

Page 5: ...le operation Use caution when drilling or cutting in the mounting area When making electrical connections make sure they are secure and properly insulated lf you must replace of the amplifier s fuses...

Page 6: ...nals observing proper polarity connect each speaker s positive lead to the appropriate positive terminal and negative lead to the appropriate negative terminal The 704 features Front L L R and R termi...

Page 7: ...r R terminal Left Front speaker Right Front speaker 10001 4 ohm subwoofer or high power speaker 0 2 channel bridged operation Connect speaker s lead to the Front L terminal and the lead to the Front R...

Page 8: ...negative lead to the terminal 4 ohm subwoofer Left front speaker Right front speaker J Left rear speaker Right rear speaker 0 3 channel front and rear bridged operation Connect speaker s lead to the...

Page 9: ...paint from the vehicle chassis and connect with bolt and star washer below the ring terminal for secure connection Remote Connect 20 gauge wire from the Remote Out lead of the source unit to the REM...

Page 10: ...tant The 12 setting should never used when the amplifier is connected to aftermarket head unit s line level RCA type outputs 8 Grossover filter selectors X OVER Crossover filter seIectors LP Low pass...

Page 11: ...e this setting if you are connecting subwoofer s or want to provide low pass filter for separate mid bass speakers FULL Full range Choose this setting if you are connecting full range speakers and are...

Page 12: ...n Check voltages at amplifier terminals with V0M PROBLEM No audio and R INDICAT0R flashes every 4 seconds CAUSE and S0LUTION DC voltage amplifier output Amplifier may need service see enclosed warrant...

Page 13: ...stall an alternator noise filter on power line between battery and alternator Check ground connections the amplifier since loose or improper ground is of the main causes for extraneous noise in your a...

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