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Manafacture: Boston Acoustics File size: 440.54 kb File name: Language of manual:

Failure to do so could lead to an electrical short if the wire insulation is worn through and the power wire is shorted to ground. Remote Input Connection Connect the REMOTE trigger lead from the head unit to the amplifier using the 3mm hex wrench to tighten the connector on the power block of the amplifier. (refer to the diagram on page 3). Speaker Output Connection Prepare each wire by stripping approximately 5.8” (16mm) of insulation. The positive (+) speaker wires are installed into the amplifier terminals marked “SPEAKER OUTPUT” / “+” (refer to the diagram on page 3). The negative (–) speaker wires are installed into the amplifier terminals marked “SPEAKER OUTPUT” / “”. Tighten the “SPEAKER OUTPUT”, “+”, and “-” terminals with the supplied 3mm hex wrench (2mm on GTA-504) to secure the wires into the terminals. If the speaker wires must be routed through a drilled or existing hole, use a nylon panel grommet to prevent fraying the wire insulation. Failure to do so could lead to an electrical short if the wire insulation is worn through and the speaker wires are shorted to ground. Note: Speaker outputs are marked “Front Output” and “Rear Output” on the GTA-504. Mono Subwoofer Operation When the amplifier is configured for mono operation, use the speaker output terminals marked for mono use (refer to the diagram on page 3). WARNING! Subwoofer impedance must not fall below 4 ohms when in MONO mode. Installation - Wiring 5 Tuning The Amplifier - Front and Rear Speakers Tuning The Amplifier - Front or Rear Speakers 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) Turn control all the way counterclockwise (minimum position). In this position, the amplifier will be less sensitive to the input signal from the head unit (refer to the diagram on page 3). 3) Crossover Control Crossovers should be turned “OFF” during this phase of setup . Move the X-OVER switch to the “OFF” position (refer to the diagram on page 3), with these settings, full-range signal is sent to the speaker outputs. If over-excursion is detected from speakers, move the switch to “HP” and slowly rotate clockwise until over-excursion is eliminated. 4) 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 should be defeated at this time. Turn head unit on, and verify that the BLUE status LED is illuminated on the amplifier. 5) Volume With the chosen musical track playing, turn the head unit volume control up until the maximum level of undistorted signal is heard from the speakers. (For most head units, this will be near the end of the volume control range.) Configuration and Connection GTA 2-Channel Amplifier Powering a Pair 6 Tuning The Amplifier - Front or Rear Speakers WARNING! 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 (refer to the diagram on page 3) until maximum undistorted playing level is heard from the speakers. Listen closely for bottoming from the speakers. If detected, rotate the input sensitivity control counterclockwise until it is eliminated. 7) Crossover Controls To achieve higher undistorted playing levels from the main speakers, the Highpass crossover must be engaged. Rotate the crossover control fully clockwise (refer to the diagram on page 3). The highpass crossover point is now set at 200Hz. Q-Tune should be set to off. Slowly rotate the input sensitivity control clockwise until maximum undistorted playing level is heard from the speakers. Listen closely for bottoming from the speakers. If detected, rotate the input sensitivity control counterclockwise until it is eliminated. Slowly rotate the highpass crossover control counterclockwise while listening for bottoming. You are lowering the crossover point, which means that more bass signal is being sent to the speakers. If bottoming is detected, rotate the input sensitivity control counterclockwise until it is eliminated and/or rotate the Highpass crossover control clockwise to raise the crossover point. 8) Q-Tune™ Control Q-Tune allows for +6dB boost of bass information centered at 45Hz and is not typically needed for full range speaker applications. Connection Diagram: ir of Full Range Speakers (80Hz Highpass) fuse Tuning The Amplifier - Front and Rear Speakers 7 Tuning The Amplifier - Subwoofer( s) Tuning 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...

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