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The Reference 80S stereo amplifier continues Audio Research’s latest design effort in creating a vacuum-tube amplifier that not only redefines ultimate music reproduction, but does it in an incredibly beautiful package.  Outwardly, the 80S shares the same dimensions as the 160M. A single shallow whisper fan is built into the bottom plate. Flexibility is built-in, too, with XLR an...[more]

Building on the successful introduction of the Centaur II stereo and mono amplifiers last year, and benefitting from the research and development used to create the Reference Series Hercules II amplifiers, this new amplifier satisfies the demand for a more powerful Performance Series amplifier. Products of the Constellation Audio “dream team,” the Centaur II 500 Stereo delivers outs...[more]

The Classic 2 is the most cost-effective way to experience the incomparable sound quality of Dan D'Agostino Master Audio Systems. Its core technologies are heavily based on the design of D'Agostino's acclaimed Momentum amplifiers. The sound combines the immense power and current needed to drive even the most exotic speakers with a subtle, sweet musicality normally associated with much smaller a...[more]

Classic 3 The Classic 3 brings the acclaimed sound of Dan D'Agostino Master Audio Systems amplifiers to home theaters and advanced 2.1-channel stereo systems. Borrowing heavily from the amplification circuits D'Agostino developed for the Momentum amplifiers, the three-channel Classic 3 is a perfect companion to the Classic 2 when outfitting a 5 or 7 channel configuration of main speakers i...[more]

Circuitry Highlights Patent pending Krell iBias Class A technology allows our latest amplifiers to run in full Class A mode to full power while minimizing heat generation. All signal gain is realized in the current domain using discrete, proprietary, multiple-output current mirrors with extraordinary open loop linearity. There are no generic integrated circuits or op amps used anywhere. Current...[more]

Circuitry Highlights Patent pending Krell iBias Class A technology allows our latest amplifiers to run in full Class A mode to full power while minimizing heat generation. All signal gain is realized in the current domain using discrete, proprietary, multiple-output current mirrors with extraordinary open loop linearity. There are no generic integrated circuits or op amps used anywhere. Current...[more]

The Stereo benefits from the same upgrades we made to the Mono. The power supply features substantially larger storage capacitors, to deliver cleaner DC power and more headroom on loud peaks. The pure copper bus bars used for the speaker outputs and power supply rails are twice the size of those in the original Hercules. Both of these improvements allow the Hercules II Stereo to perform even be...[more]

The Inspiration 2 Stereo and Mono use the same Line Stage Gain Module input stage found in our top amplifiers. Hand-matched, low-noise transistors combine with a servo circuit that corrects any signal balance inconsistencies. The Inspiration 2 amplifiers’ Constellation Link interface connects to Constellation amplifiers to remove one amplification stage from the signal path, resulting in ...[more]

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Every major section of the amplifier - power supply, input, driver, and output stages - have all been enhanced in this advancement. A new transformer winding pattern provides over 50% more current output from the same transformer footprint. This additional current offers greater headroom during dynamic passages. A reinvisioned input stage combines a brand new circuit topology with advanced comp...[more]