RADAR is a price search engine. We link to the original listing — we never sell direct. Transactions happen on the source site.
US$299 is ambitious for this piece compared with the recent used market, which centers around US$180 and tops out near US$194 at the 75th percentile. That means this ask is roughly US$100 above a typical fair price, so it needs to be justified by exceptional condition, strong provenance, or extras.
That said, the GSP-560 is a respected vintage Adcom processor, and for the right system it can still be a useful, characterful piece if you want period-correct surround processing or a collectible bit of old-school hi-fi history. I’d look closely at operational status, remote and manual inclusion, and whether any servicing has been done; at this price, completeness and confirmed functionality matter a lot.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
ADCOM emerged in the 1970s as a family-owned American audio venture founded by audiophile Newt Channin, initially focusing on exceptionally musical moving-coil phono cartridges that set it apart from typical entrants. The brand quickly pivoted to electronics with the groundbreaking GFA-1 power amplifier in 1979, delivering 200 watts per channel and robust current for demanding speakers, propelling ADCOM into prominence during the high-fidelity boom of the 1980s and 1990s.
The company built its legacy on high-performance amplifiers, including the Nelson Pass-designed GFA-555 that garnered worldwide acclaim, alongside AV tuners, preamps, and multichannel power amps like the GFA-6000 tailored for home theater. While early roots lay in phono gear, ADCOM specialized in electronics offering superior sound quality without extravagant pricing, eschewing speakers, headphones, or extensive cabling lines.
Positioned firmly in the mid-fi realm, ADCOM defined accessible high-end audio for discerning buyers, blending value and performance that rivaled pricier competitors. After challenges and ownership shifts—including a Thai firm and a faltering 2010 relaunch—the brand staged a robust comeback in 2024 under J&B Distribution, reviving classics like the GFA-555ms alongside modern integrated amps and preamps, reclaiming its spot among savvy audiophiles seeking reliable, soul-stirring sound.
See all ADCOM listings on RADAR.
