Rear Crossover Control | Boston Acoustics GTA-802, GTA-504, GTA-502

Tuning 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 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.

5) Rear 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 perceived output, and a lower setting will make the bass response more omnidirectional.

6) Q-Tune™Control

Once the crossover point has been determined, you may choose to use Q-Tune™to increase the bass information. Q-Tune will offer a +6dB bass boost centered at 45Hz which can be beneficial if more low bass output is desired. To engage Q-Tune move the selector switch to the “ON” position (refer to the diagram on page 3).

7) Optional GTA-RSL Control

The optional remote level control (GTA-RSL) gives you independent level adjustment of the subwoofer’s output level beyond the standard system volume control. Please refer to the RSL’s manual for installation instruction. The GTA-RSL is available sepa- rately, please consult your authorized Boston Acoustics dealer.

Note; If using the GTA-504 to run front and rear speakers, set rear X-over to HP and follow set up/tuning instructions for the front channels for rear.

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Tuning The Amplifier - GTA-504

Connection Diagram:
h Front Speakers and a Subwoofer	11
Lowpass Rear w/ Q-Tune™On	11

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.