Thursday, March 17, 2011

Krell Phantom

・Phantom Preamplifier
With richly layered staging and finely rendered textures, the Phantom preamplifier reveals subtleties previously heard in Evolution Two based systems only. The Phantom is also the first Krell preamplifier to offer crossover capabilities. The crossover functionality allows a subwoofer/satellite speaker arrangement to maintain the highest quality sonic performance possible. Previous to the Phantom preamplifier, this system configuration would require signals to pass through a subwoofer’s lower quality crossover circuitry.

・Crossover Highlights
Owing to Krell’s work in the Modulari Duo Reference loudspeaker, the unique crossover feature is a highly sophisticated option. Definable parameters include independently assignable crossover frequencies and filter types for the high and low pass sections. Choices include 40Hz, 55Hz, 75Hz, and 100Hz crossover points with 12dB, 24dB, and 48dB Butterworth or 24dB Linkwitz-Riley style filters. A major advantage to using the crossover section is the high pass portion uses the full Phantom preamplifier circuitry for its output stage.

・Circuitry Highlights
The Phantom preamplifier is dual monaural circuit design with the left and right channels afforded their own power supply regulation and individual full chassis sized boards. All signal gain is realized in surface mount topology using proprietary multiple-output current mirrors with nearly 500 times the open loop linearity of other designs 1.5 MHz open loop bandwidth in a zero feedback, balanced, Krell Current Mode design terminating in Krell CAST. Negative feedback is not used anywhere in the preamp, nor is it necessary. The volume control is realized with a balanced resistor ladder — bandwidth and transient response of the preamp
circuitry are virtually unaffected by the volume setting.

・Power Supply Highlights
The Phantom audio circuits receive power from a Krell Current Mode analog power supply housed in its own dedicated chassis. The power supply avoids the common integrated circuit topology used in many preamplifiers and instead mimics the design topology of Krell Evolution e Series amplifiers. The circuitry is completely discrete giving it the ability to respond quickly to current demands and also be unaffected by all but the most severe AC voltage power fluctuations. Oversized for a preamplifier, the power supply features a 250 VA transformer and 39,600µF of capacitance.

・The Phantom Preamplifier is shipping in the 2nd Quarter of 2011 with a suggested US retail price of $17,500. The Phantom Crossover Option will be $2,500. The Evolution 202 will be discontinued at that time.

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