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PREOWNED – FULLY TESTED – INCLUDES ORIGINAL POWER CABLE
The Integra ADM-2.1 Stereo Power Amplifier is a robust 2-channel audio amplifier built on Onkyo’s Wide Range Amplifier Technology (WRAT) platform.
Key Specifications
• Power Output: 100 watts per channel into 8 ohms (20 Hz–20 kHz, 0.08% THD).
• Frequency Response: 10 Hz to 100 kHz (±1 dB) for full-range audio playback.
• Signal-to-Noise Ratio: 110 dB for clean, distortion-free sound.
• Damping Factor: 100 for tight control over your speakers.
Notable Features
• Auto Turn-On Modes: Features both audio-sensing and 12V trigger options to integrate smoothly with other gear.
• Input/Output Loop: Allows you to chain multiple amplifiers together for multi-room audio setups.
• Build Quality: Uses discrete output transistors and Nichicon Muse filter capacitors for high-current delivery
This is a fair ask, slightly on the strong side but not out of line: at US$160, it sits just above the US$149 median and a touch over the US$155 75th percentile for recent used comps. That makes it a reasonable buy if the unit is clean and working properly, but not a standout bargain.
What makes it worth a look is that Integra power amps generally have a solid reputation for honest, controlled drive and good build quality, so a healthy example can be a very satisfying foundation piece. If the seller can confirm stable operation, no hum, and clean terminals, the extra US$5 over the top quartile is easy to justify; if not, I’d want a little room for risk at this price.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Integra traces its roots to 1969, when Japanese audio pioneer Onkyo launched the brand to showcase its most prestigious electronics, emphasizing integration and fusion in high-performance systems. Evolving from a premium label under Onkyo, it became an independent division in 1999 or 2000, targeting custom installers with gear optimized for seamless home automation. Today, under the Premium Audio Company—recently acquired by Gentex—Integra maintains its Japanese heritage while expanding accessibility beyond specialist networks.
The brand specializes in premium AV receivers, processors, and home theater components, including multi-channel amplifiers like the DRX 5.4 with 120W power output per channel. Its lineup features CD, DVD, and Blu-ray players, all engineered for advanced integration via the proprietary Integra Serial Control Protocol (ISCP). Integra prioritizes expandability, multi-zone capabilities, and smart home compatibility over standalone speakers, turntables, DACs, headphones, or cables.
Positioned as a high-end choice for discerning custom integrators and home theater enthusiasts, Integra commands respect for its world-class build quality, innovative control features, and benchmark-setting performance. No longer confined to niche channels, it now appeals directly to knowledgeable buyers seeking robust, future-proof systems that rival the best in the industry.
See all Integra listings on RADAR.
