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New, the SI-275 reportedly sold around US$690, while current used asks commonly cluster near US$100–US$150. At US$160, this is fair but not a standout bargain: it sits just above the comparable-listing median of US$150, comfortably within the normal market range of US$98–US$226. A working, tested example would be sensibly priced; untested or poorly documented, it should be cheaper.
Its appeal is the substantial high-current design: 75 watts per channel into 8 ohms, 100 watts into 4 ohms, separate channel power supplies, a toroidal transformer, and useful trigger/audio-sense turn-on options. It is a clean, quiet, capable choice for stereo or distributed-audio duty, with enough current for demanding speakers. At this price, prioritize confirmation of both channels, low hum, reliable turn-on, and intact binding posts; included rack hardware or original documentation would make the ask more attractive.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Niles Audio traces its origins to 1978, when it launched in Miami, Florida, as a pioneer in switching systems for audio retailers. From these humble beginnings, the company evolved into a cornerstone of custom home audio, earning its stripes as a founding member of CEDIA and building a legacy of installer-focused innovation over four decades. Acquired by Linear LLC in recent years, Niles continues to uphold its heritage while expanding under new ownership.
The brand specializes in comprehensive whole-home audio solutions, offering over 500 products that span architectural speakers, amplifiers, receivers, automation controls, and accessories for seamless integration. Its portfolio emphasizes multi-room distribution, home theater systems, outdoor landscape audio, and cutting-edge options like the nearly invisible Cynema Soundfield in-wall soundbar, all designed for custom integrators to deliver professional-grade performance across indoor and outdoor spaces.
Niles holds a strong mid-to-high-end position in the custom installation market, renowned among savvy homeowners and professionals for reliable, high-quality distributed audio that blends effortlessly into modern living. Far from a vintage collector's niche, it remains a go-to for discerning buyers seeking robust, integrator-friendly systems that prioritize exceptional entertainment without compromise.
See all Niles Audio listings on RADAR.
