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• Overview – The Krell KAS-2 Monoblock is a Class A solid-state monoblock power amplifier from American manufacturer Krell, positioned as the lower-output companion to the company’s flagship Krell Audio Standard (KAS).
• Key Technology – Krell’s Sustained Plateau Bias keeps the output stage in Class A operation. It does this by shifting between discrete bias levels as the musical signal demands. The Krell KAS-2 Monoblock is fully balanced, with both XLR and RCA inputs.
• Performance – Stereophile’s review of the Krell FPB 600 noted that, at the time of its review, the KAS-2 was considered the best solid-state design yet. It was said to be a substantial improvement on Krell’s earlier KSA-S series.
• Specs – The Krell KAS-2 Monoblock delivers 175W into 8Ω, 350W into 4Ω, 700W into 2Ω and 1,400W into 1Ω. Total harmonic distortion: 0.036%. Signal-to-noise ratio: 113dB. Damping factor: 150. Input sensitivity: 1.9V. Input impedance: 47kΩ. Inputs: XLR and RCA. Outputs: binding posts. A front-panel meter shows power output, with LED indicators for bias plateau and power/standby.
A notable reference-era Krell, the FPB 600 is priced exactly at the used-market median: S$8,800 versus a recent comparable range of S$8,709–S$10,321, so this is a fair price rather than a bargain or an ambitious ask.
What makes it worthwhile is its extraordinary current delivery: 600 watts per channel into 8 ohms, with substantial headroom into difficult loads, plus a fully balanced design and famously authoritative, tightly controlled bass. The “like new” condition adds real appeal at the median price, especially for a clean example of this large, heavy amplifier. Before committing, confirm it has been tested under load, check both balanced and single-ended inputs, and make sure transport and suitable mains arrangements are practical; this is a roughly 82 kg, high-consumption component.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Krell Industries, founded in 1980 in the United States by Dan D'Agostino and his wife Rondi, emerged from a passion for pushing audio engineering boundaries. Based initially in Bridgeport, Connecticut, and later settling in nearby Orange, the brand drew its name from the advanced alien race in the 1956 film Forbidden Planet, symbolizing limitless technological power. The company's debut at the 1981 Consumer Electronics Show with the KSA-100, a high-power Class A amplifier, sparked immediate demand and established Krell as a force in American hi-fi innovation.
Krell specializes in high-end amplification, with its power amplifiers—epitomized by flagships like the Master Reference Amplifier—earning legendary status for their raw dynamics and precision. The lineup extends to preamplifiers, surround sound processors, digital-to-analog converters, CD and Super Audio CD players, loudspeakers, and subwoofers, all engineered for uncompromised performance in music and home theater systems.
Positioned firmly at the pinnacle of the high-end audio market, Krell commands respect among discerning audiophiles for its cutting-edge circuitry, massive power supplies, and relentless pursuit of sonic excellence. A top-tier brand alongside legends like Levinson and Threshold, it appeals to buyers seeking reference-level gear that defines the genre, even amid recent ownership transitions following Rondi's passing in 2024.
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