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4 pr. balanced via XLR connectors
input/output7 pr. single-ended via RCA connectors
input/output Optional Rack Mount Kit
17.3 in W x 7.6 in H x 18.3 in D
43.
8 cm W x 19.2 cm H x 46. 4 cm D 1 remote IR detector input via 3-conductor 3.5 mm
connector
3ea 12V Trigger input/outputPower Supply Highlights
The Illusion 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 Illusion power supply is gentle on AC requirements
when not in use. A new eco-friendly design reduces standby power draw to 2W.
4 pr. CAST via 4-pin bayonet connectors input/output
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2ea preamplifier link via RJ-45 connector
Crossover Highlights
Owing to Krells 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 Illusion preamplifier circuitry for its output stage. Circuitry Highlights
The Illusion 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.
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SPECIFICATION HIGHLIGHTS
Krell ®is a registered trademark of Krell Industries, LLC., and is restricted for use by Krell Industries LLC., its subsidiaries, and authorized agents. All other trademarks and trade names are
registered to their respective companies. © 2014 by Krell Industries, LLC. All rights reserved.
THE LEADER IN AUDIO ENGINEERING Krell Industries,
LLC. - 45 Connair Road - Orange, CT 06477-3697 USA
Tel: 203-298-4000 - Fax: 203-799-9796 - Sales Dept: 203-298-4010 - contact@krellonline.com - www.krellonline.com
All operational features, functions, specifications, and policies are subject to change without notice. The Illusion preamplifier extends the Krell tradition of separating the power supply from the audio circuitry in our flagship
preamplifiers. Sharing the new Class A iBias power amplifier aesthetic and featuring Krell CAST technology, the Illusion
preamplifier is the ideal match for the new Solo 375 and Solo 575 power amplifiers.
The optional crossover functionality offers the ability to use a subwoofer/satellite speaker arrangement and still maintain the
highest quality sonic performance. Previous to the Illusion preamplifier, this system configuration would require signals to pass
through a subwoofers lower quality crossover circuitry. The Illusion preamplifier is the centerpiece of a world class audio
system where space is at a premium.
Illusion Preamplifier
