Audio Research continues to expand its revitalized lineup with the introduction of the S-200, a high-performance solid-state stereo power amplifier that delivers substantial power while preserving the brand’s signature musicality and transparency.
As part of a broader wave of new core amplification products announced in 2025—the company’s largest simultaneous release in recent history—the S-200 joins the S-100 as a dedicated entry in Audio Research’s solid-state series. Positioned as the more powerful sibling, it targets demanding loudspeaker systems that require authoritative control, dynamic headroom, and effortless drive without sacrificing finesse.
Class A/B design
The S-200 is a pure Class A/B design built on a true dual-mono architecture. At its heart lie dual toroidal transformers that feed independent, fully balanced stereo circuits. Audio Research has opted for bipolar output transistors over MOSFETs, citing superior purity, transparency, and dynamic expression. This choice contributes to the amplifier’s ability to render fast transients with precision, deliver controlled bass, and maintain clarity even through complex musical passages.
Power output
Power output stands at 200 watts per channel into 8 ohms, doubling cleanly to 400 watts per channel into 4 ohms—figures that ensure compatibility with a wide range of speakers, including those with lower sensitivity or challenging impedance curves. Total harmonic distortion remains below 0.1% from 0.25W to rated output at 1kHz, while frequency response is ruler-flat at ±0.1dB from 20Hz to 20kHz. Input sensitivity is 1.8V RMS for full output, with both balanced XLR and single-ended RCA inputs offering a high 100kΩ impedance for easy system matching.
Visually, the S-200 pays homage to Audio Research’s classic aesthetic while embracing a sleeker, more contemporary execution. The machined aluminum chassis is available in black or silver anodized finishes, featuring custom heat sinks and a clean front panel devoid of visible fasteners. A standout element is the pair of power output meters, styled in the vein of the brand’s modern designs and set against a solid black background—offering a functional and elegant nod to vintage VU aesthetics without the transparency of the flagship Reference series’ Ghost Meters.
Additional performance highlights include a damping factor of 300 (20Hz–1kHz), exceptionally low noise at –100dB, and efficient power consumption: just 0.25W in standby, 48W idle, and up to 475W at rated output (120V AC). The amplifier measures a standard 19″ wide rack-friendly footprint at 7″ tall and 17.5″ deep, weighing a substantial 41 lbs (19 kg) net, with shipping weight of 63 lbs (28.5 kg).
Every S-200 undergoes rigorous bench testing followed by critical listening proofing in Audio Research’s Minnesota facility, where the company continues to hand-craft its Reference-series tube amplifiers alongside these new solid-state models. The result is an amplifier that, according to early listener impressions, offers fluid, detailed, and surprisingly effortless sound—qualities that set it apart from more analytical solid-state designs.
Pricing
Priced at approximately $12,950 (US retail, depending on finish and market), the S-200 slots comfortably between entry-level high-end amplification and the ultra-premium Reference tier. It appeals to audiophiles seeking robust, reliable power delivery with the refinement Audio Research has long been celebrated for—whether paired with the matching LS-3 solid-state preamplifier, the hybrid LS-2, or other high-quality control units.
With the S-200 now shipping through authorized dealers worldwide, Audio Research reaffirms its commitment to bridging heritage craftsmanship with contemporary performance demands. For systems craving scale, grip, and emotional engagement, this latest solid-state offering promises to breathe new life into recorded music.
