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New, this class of Boston GT amplifier sold in the roughly US$500–800 range, depending on model, so US$200 is not outrageous—but it is clearly above this model’s typical used market. Your 34 comparable listings put the median at US$109, with the 75th percentile at US$187; at US$200, this is an ambitious ask unless it is tested, exceptionally clean, and complete.
The GT-42 remains a capable four-channel, high-current design: bridge-stable at 2 ohms, flexible for active systems or a front stage plus subwoofer, and known for strong build quality and efficient Class AB performance. The catch is age and unknown condition. Uneven channel output and aging small electrolytic capacitors are documented failure issues, so insist on a powered test showing all four channels working cleanly, no protection faults, and quiet operation. At US$200, proof of health and included terminal hardware are essential; otherwise, a more sensible target is around US$109–150.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Boston Acoustics emerged in 1979 from the innovative spirit of America's Northeast audio scene, founded by Advent veterans Andy Kotsatos and Frank Reed in Lynnfield, Massachusetts. Drawing on their experience at pioneering firms like KLH and Advent, the duo established the company to craft high-quality loudspeakers that balanced engineering precision with musical fidelity. Their early flagship, the A70, quickly earned acclaim in the 1980s for its exceptional sound, setting a foundation rooted in MIT-level expertise and a commitment to superior design at accessible prices.
The brand focused primarily on speakers across diverse categories, including home bookshelf and floorstanding models, custom architectural installations, and robust car audio systems. They expanded into surround sound solutions for home theater and even ventured into compact computer speakers and outdoor options like the SoundWare series, while maintaining a core emphasis on transducers rather than amplifiers, turntables, or headphones.
Positioned as a mid-tier powerhouse, Boston Acoustics built a sterling reputation for value-driven performance that punched above its price, appealing to discerning audiophiles through dealer networks and later direct sales. Acquired by D&M Holdings in 2005 and integrated into Sound United by 2017, the brand's legacy endures among vintage collectors for its engineering excellence, though active production has ceased.
See all Boston Acoustics listings on RADAR.
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