Installation - Wiring

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 inline fuse should equal the value of the internal fuse of the amplifier if only the single amplifier is connected to this wire. If other devices are connected to this wire, the fuse value should be of sufficient capacity to handle the demand.

Wire Gauge

The amplifier accepts up to 8-gauge stripped wire at the DC power and ground input terminals, and 8-gauge is recommended as a minimum. Wire runs should be kept to the minimum practical length.

Power 12v and Ground (GND) Connection

Strip approximately 5/8” (16mm) of insulation. The positive (+) power wire is installed into the amplifier terminal marked “12v”. The negative (–) wire is installed into the terminal marked “GND”. The ground wire should be as short as possible and connected directly to the chassis of the vehicle. Make sure that the chassis connection point is free of rust, grease, dirt, paint, and other materials that may insulate the ground wire from making proper connection. Tighten the 12v and GND terminals with the supplied 3mm hex wrench to secure the wire into the terminals. If the power wire must be routed through a drilled or existing hole, use a nylon panel grommet to prevent the insulation from fraying. 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 pos- itive (+) speaker wires are installed into the amplifier terminals marked “SPEAK- ER 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

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Boston Acoustics GTA-802, GTA-504, GTA-502 manual Installation Wiring
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GTA-504, GTA-802, GTA-502 specifications

Boston Acoustics has long been synonymous with high-quality audio equipment, and their GTA series of amplifiers—the GTA-502, GTA-802, and GTA-504—showcase the brand’s commitment to delivering exceptional sound performance. Each model in the GTA series is designed to cater to different audio needs, while maintaining Boston Acoustics' hallmark of precision and clarity.

The Boston Acoustics GTA-502 is a two-channel amplifier that delivers a robust power output of 50 watts per channel at 4 ohms, making it an excellent choice for smaller audio systems or as part of a more extensive setup. One of its standout features is the Class AB amplification, which combines high efficiency with minimal distortion, allowing for dynamic sound reproduction. The GTA-502's compact size and lightweight construction make it an ideal option for those with limited space, while still providing rich, powerful audio that can fill a room.

Stepping up in power, the GTA-802 is a versatile 2-channel amplifier with an impressive output of 80 watts per channel at 4 ohms. This amplifier incorporates advanced thermal protection and short circuit protection technologies that ensure reliability and longevity. With its user-friendly interface, including precise gain controls and an LED indicator for monitoring performance, the GTA-802 is not only powerful but also easy to use. Its enhanced frequency response and low total harmonic distortion provide a clear and balanced audio experience, making it a popular choice among audiophiles.

The GTA-504 is the powerhouse of the series, featuring a 4-channel amplifier with 50 watts per channel at 4 ohms. This flexibility allows users to run multiple speakers or create a bi-amped system, optimizing sound performance. Like its counterparts, the GTA-504 benefits from Class AB amplification, which delivers a warm sound with detail and nuance that enriches any listening experience. The amplifier also includes a built-in crossover, making it suitable for both home theater setups and high-fidelity music systems. Its rugged construction signifies durability, ensuring that the unit stands up to the challenges of consistent use.

In conclusion, Boston Acoustics’ GTA series amplifiers—the GTA-502, GTA-802, and GTA-504—embody the brand's dedication to superior sound quality and innovative design. Each model offers its unique features and capabilities, catering to diverse audio needs while ensuring excellent performance, precision, and reliability. Whether you're an audiophile or a casual listener, the GTA series promises to enhance your audio journey with their rich, enveloping sound.
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