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Age matters here: the SI-2100 is an older, established installation amplifier rather than a current-generation design, but its practical specification remains useful. At USD 120, this is a strong deal: it sits well below the USD 150 median and beneath the USD 99–USD 229 comparable range’s 25th-percentile threshold only narrowly, making it attractively priced if functional.
The appeal is straightforward utility. It delivers 100 watts per channel into 8 ohms, handles demanding distributed-audio loads, offers trigger and audio-sensing turn-on, and can be bridged for roughly 400 watts into 8 ohms. Cascade outputs and rack-friendly construction make it particularly handy for multi-room systems or passive-subwoofer duty. Since the listing says condition is unknown, confirm both channels, bridge mode, protection behavior, and included rack ears before buying; even so, USD 120 leaves reasonable room for a sensible used purchase.
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.
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