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Specifications
Introduction
Thank you for choosing Boston Acoustics and congratulations, you’ve made the right choice. You’re now equipped for the open road. Your high performance GTA amplifiers are engineered to perform and built to last. These products represent the pinnacle of performance and innovation that Boston Acoustics is famous for. We hope you enjoy your amplifier and the road ahead.
Technical Specifications:
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GTA-502 |
GTA-802 |
GTA-504 |
Rated Power (CEA-2006-A): |
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@ 4-Ohm (Stereo): |
50 Watts x 2 |
80 Watts x 2 |
50 Watts x 4 |
@ 2-Ohm (Stereo) |
80 Watts x 2 |
130 Watts x 2 |
80 Watts x 4 |
@ 4-Ohm (Mono) |
160 Watts x 1 |
260 Watts x 1 |
160 Watts x 2 |
Impedance Stability: |
2Ω |
2Ω |
2Ω |
Stereo: |
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Mono: |
4Ω |
4Ω |
4Ω |
Frequency Response (-3dB): |
10Hz–50kHz |
10Hz–50kHz |
10Hz–50kHz |
Signal-to-Noise Ratio: |
>90dB |
>90dB |
>90dB |
(A Weighted) |
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THD+N: |
0.05 |
0.05 |
0.05 |
Highpass Crossover: |
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Frequency Range: |
50Hz - 200Hz |
50Hz - 200Hz |
50Hz - 200Hz |
Slope (dB Per Octave): |
12dB |
12dB |
12dB |
Lowpass Crossover: |
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Frequency Range: |
50Hz - 200Hz |
50Hz - 200Hz |
50Hz - 200Hz |
Slope (dB Per Octave): |
12dB |
12dB |
12dB |
Signal Voltage Input Range: |
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Low Level (RCA) Input: |
200mv - 5v |
200mv - 5v |
200mv - 5v |
Speaker Level Input: |
400mv - 10v |
400mv - 10v |
400mv - 10v |
Fuse Amp Rating (ATC): |
20 Amp |
30 Amp |
2 x 25 Amp |
Dimensions: |
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Width: |
9 3⁄8” (238mm) |
11 3⁄4” (298mm) |
14 3⁄8” (358mm) |
Height: |
2 3⁄8” (60mm) |
2 3⁄8” (60mm) |
2 3⁄8” (60mm) |
Depth: |
8 3⁄8” (211mm) |
8 3⁄8” (211mm) |
8 3⁄8” (211mm) |
Parts List:
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GTA-502 |
GTA-802 |
GTA-504 |
Owners Manual: |
x 1 |
x 1 |
x 1 |
3mm Hex Wrench: |
x 1 |
x 1 |
x 1 |
2mm Hex Wrench: |
n/a |
n/a |
x 1 |
Speaker Level Input Cable: |
x 1 |
x 1 |
x 2 |
Mounting Screws: |
x 4 |
x 4 |
x 4 |
Replacement Fuses (ATC): |
x 1 (20 amp) |
x 1 (30 amp) |
x 2 (25 amp) |
2
Connections and Controls
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Speaker Level Input |
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RCA Input (Left and Right) |
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Gain (250mv to 5.0v - continuously variable) |
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Crossover Frequency Adjustment (50Hz to 200Hz - continuously variable) |
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ψ |
Q-Tune™ Equalization Boost (+6dB @ 45Hz) |
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ζ |
Crosssover Filter Switch (HP / Off / LP) |
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{ |
GTA-RSL Port (Remote Gain) |
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Speaker Output Block (Left / Right) or (LF / RF / LR / RR on GTA-504) |
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Status LED (Blue = Normal / Red = Fault Mode) |
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Fuse (Replace with same value only, refer to specifications on page 2) |
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Power Block (12v / Remote / Ground) |
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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.
Speaker Level Input Cable
GTA amplifiers offer a dedicated speaker level input for ease installation into factory systems when an RCA (low level) signal is not available. Wiring code for the cable is industry standard;
White Solid = Left Positive |
White w/ Black Stripe = Left Negative |
Gray Solid = Right Positive |
Gray w/ Black Stripe = Right Negative |
Controls / Connections
Warning: Do not connect both Speaker Level and RCAs into the amplifier at the
same time as damage to the amplifier may occur.
3
Installation - General
Installation - General
WARNING! 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 You Install
Before you install the unit, disconnect the negative (–) battery cable in the engine compartment of the vehicle. Doing so will prevent damage to both the electrical system of the vehicle and the amplifier during installation.
Battery and Charging System
In order for the amplifier to function correctly, the electrical system of the vehicle should be professionally checked for overall electrical capacity. When used, the amplifier will increase the demand on the battery and alternator. Therefore, both should be thoroughly evaluated before installing the amplifier to ensure they are in normal operating condition and able to handle the increased demand the amplifier will present to the vehicle’s electrical system.
Wire Routing
Do not run the power wire near any low-level signals or audio cables such as the RCAs from the head unit. Noise can be introduced into the amplifier when this occurs. It is helpful to diagram the wire layout first before any installation is initiated.
Choose the Mounting Location
Plan your installation so that the amplifier is mounted where adequate ventilation is available. Never mount an amplifier in the engine compartment of a vehicle!
Passenger and Trunk Compartment Mounting
If the amplifier is mounted under a seat, be sure that there is adequate space around the amplifier once installed, 1” (25mm) recommended minimum. Do not allow seat padding or other obstructive material to press down on the amplifier.
When mounting in a trunk, choose a location that will be protected from sliding cargo or other materials. Mount the amplifier to solid surfaces only. Do not mount to plastic trim panels. Do not mount the amplifier with Velcro, double-stick tape, or by wedging into position. Amplifier should be mounted using the screw mounts in the endpanels and with the provided mounting screws.
Cooling
Position the amplifier so that there is adequate space around the amplifier once installed, 1” (25mm) recommended minimum.
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