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 Evolution 222


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1.5 MHz open loop bandwidth in a zero feedback, balanced, Krell Current Mode design terminating in Krell CAST.

All signal gain is realized in a surface mount topology using proprietary multiple-output current mirrors with nearly 500 times the open loop linearity of other designs.

Zero negative feedback is used anywhere in the preamp, nor is it necessary. Open-loop distortion is typically less than 50 parts per million.

A complete Evolution (source, preamp, amplifier) system, connected in CAST, reduces the number of voltage gain stages to the minimum, one. The resulting noise floor is approaching the theoretical limit of technology.

The volume control is realized with a 16-bit balanced resistor ladder -- bandwidth and transient response of the preamp circuitry are virtually unaffected by the volume setting.

150 VA toroidal transformer drives four 6-amp bridge rectifiers and 19,800 microfarads of filter capacitance.

Krell designed digital control circuit monitors and optimizes the preamplifier's operating parameters.




The Evolution Series culminates more than two decades of cutting edge audio design and includes stereo and home theater components that embody 26 years of Krell design and manufacturing excellence. When envisioning Evolution, Krell had a solitary goal - to handcraft a range of components that, simply put, were the best sounding products ever built. The result is a synthesis of almost impossible contradictions; a unique blend of beauty, grace, and the effortless power synonymous with the Krell name.


The Evolution 222 brings the advanced technologies and inspired design of the Evolution 202 to single chassis format. Often overlooked, the preamplifier is a critical component in the signal chain. A small signal must be carefully amplified without damaging the ephemeral staging and dimensional components of the music. Heard through the Evolution 202, music emanates from an expanse that outlines the recording venue, transporting you to the moment of creation. The Evolution 222 is the perfect companion for the Evolution 402 Amplifier and Evolution 505 Source. Engaging, captivating, entrancing -– new from Krell, classic from Krell.