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Boston Acoustics GTA-502 manual

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Table of contents for the manual

  • Page 1

    High P er formance T wo and F our Channel Ampliers GTA[...]

  • Page 2

    Specifications 2 Introduction T hank you for choosing Boston Acoustics and congratulations, you’ve made the right choice. Y ou’re now equipped for the open road. Y our high performance GT A amplifiers are engineered to perform and built to last. These products represent the pinnacle of performance and innovation that Boston Acoustics is famous [...]

  • Page 3

    Connections / Controls 3 Status LED The Boston Logo will illuminate “Blue” under normal operating conditions. The LED will illuminate “Red” during start-up and under fault conditions. If the LED is still red after start-up, please refer to troubleshooting on page 12. u Speaker Level Input v RCA Input (Left and Right) w Gain (250mv to 5.0v -[...]

  • Page 4

    Installation - General 4 W ARNING! Before driving the amplifier mounting screws through any surface, be sure of what is behind that surface. Check for the gas tank, brake lines, and any vehicle wiring harness. Never run wires outside or under the vehicle or where they could become broken or interfere with the safe operation of the vehicle. Before Y[...]

  • Page 5

    Installation - Wiring 5 Amplifier Fuses Although the amplifier has an internal fuse (s), additional fuse protection should be installed as close as possible to the battery on the positive (+) power wire going to the amplifier . An inline fuse should be installed at no more than 18" (46cm) on the positive (+) power wire. The rating of the inlin[...]

  • Page 6

    T uning The Amplifier - Front and Rear Speakers 6 1) Music The material chosen for head unit/amplifier system setup must be both clear in recording quality and dynamic in amplitude. Many audiophile “test” discs have musical tracks with both of these characteristics and should be used. 2) Input Sensitivity Control (Gain) T urn control all the wa[...]

  • Page 7

    T uning The Amplifier - Front and Rear Speakers 7 T uning The Amplifier - Front or Rear Speakers W ARNING! A distorted signal from the head unit sent to the amplifier can cause loudspeaker failure at higher listening levels. 6) Input Sensitivity Control (Gain) Slowly rotate the control clockwise (r ef er to th e di ag ra m o n p ag e 3 ) until maxi[...]

  • Page 8

    T uning The Amplifier - Subwoofer(s) 8 T uning The Amplifier - Subwoofer(s) 1) Head Unit The head unit should have all controls such as bass, treble, balance, and fader set to the flat or centered position. The volume control should be at the minimum setting. If the head unit has any equalization or bass management features such as boost , they sho[...]

  • Page 9

    T uning The Amplifier - Subwoofer(s) 9 T uning The Amplifier - Subwoofer(s) 4) Crossover Control Move the selector switch to “LP” (refer to the diagram on page 3). In this setting, lowpass signal is sent to the speaker outputs. Experiment with the crossover point settings while the subwoofer is active. A higher setting will increase the perceiv[...]

  • Page 10

    T uning The Amplifier - GT A-504 10 Configuration and Connection Diagram: GT A-504 Amplifier Powering Both Front Speakers and a Subwoofer 80Hz Highpass Front, 65Hz Lowpass Rear w/ Q-T une T uning The Amplifier - Front Speakers and Subwoofer(s) 1) Head Unit The head unit should have all controls such as bass, treble, balance, and fader set to the fl[...]

  • Page 11

    T uning The Amplifier - GT A-504 11 Connection Diagram: th Front Speakers and a Subwoofer Lowpass Rear w/ Q-T une ™ On T uning The Amplifier - Front Speakers and Subwoofer(s) 4) Front Crossover Control Cont. Slowly rotate the input sensitivity control clockwise until maximum undistorted playing level is heard from the speakers. Listen closely for[...]

  • Page 12

    Amplifier T roubleshooting Guide S tatus LEDs on Amplifier not Lit—Head Unit (Source) T urned “ON” V erify Remote turn-on wire from source to amplifier has proper voltage P ower (B+) connections at amplifier , terminal blocks, and battery are secure Ground (GND) connections at amplifier and vehicle chassis are secure B attery B+ fuse and ampl[...]