With the Phantom Preamplifier, musicians appear silhouetted by the air about them, filling the room with a mesmerizing depiction
of the recording. Music emanates from an expanse that outlines the recording venue, transporting you to the moment of creation.
Coupling advanced technologies and inspired design, the Phantom preamplifier elevates preamplifier performance to an art form.
The Phantom preamplifier is the first Krell preamplifier to include an optional crossover. The crossover functionality offers the
ability to use a subwoofer/satellite speaker arrangement and still maintain the highest quality sonic performance. Previous to the
Phantom preamplifier, this system configuration would require signals to pass through a subwoofer's lower quality crossover circuitry.
The Phantom preamplifier is the centerpiece of a world class audio system where space is at a premium.
Owing to Krell's work in the Modulari Duo Reference loudspeaker, the unique crossover feature is a highly sophisticated option.
When the optional board is present, additional crossover menu items become available. 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. The high pass section of the crossover
uses the full Phantom preamplifier circuitry for its output stage.
The Phantom preamplifier is a 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. A complete Krell system (source, preamp, and amplifier)
system, connected using CAST interconnects reduces the number of voltage gain stages to the minimum, one. The resulting noise floor
approaches the theoretical limit of technology. Negative feedback is not used anywhere in the preamp, nor is it necessary. Open-loop
distortion is typically less than 0.003%. 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 290 VA transformer and 41,600µF of capacitance. Locating the power supply in its own chassis presents the ideal configuration for
isolating stray electrical and magnetic interference from the critical preamplifier signal path. Capable of delivering current and
voltage swing for any musical event, the Phantom power supply is gentle on AC requirements when not in use. A new eco-friendly design
reduces standby power draw to 2W.
The Phantom preamplifier is offered in diamond-cut silver or a luxurious black finish.