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 subwoofer’s lower quality crossover circuitry. The Illusion preamplifier is the centerpiece of a world class audio system where space is at a premium.

Crossover Highlights

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 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.

Power Supply

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.




Krell Industries is the premier manufacturer of high performance audio equipment, award winning amplifiers, preamplifiers, surround sound processors, and digital-to-analog converters for music lovers and home theater aficionados.

The world’s most discriminating audiophiles and product reviewers have consistently recognized Krell components for setting new performance benchmarks. The sheer breadth of Krell amplifiers’ dynamic range conveys a startling realism—each iteration transcending the previous. Seemingly unlimited frequency response combined with unerring accuracy and fortitude, continue a tradition that began with Krell’s legendary KSA-100—the first high power, high-current, true Class A biased stereo power amplifier available to audiophiles.

The Krell legacy proudly continues to evolve, resulting in products delivering innovative engineering, build quality perfection and outstanding audio performance.

If you would like to buy Krell amplifiers of other Krell sound equipment, you can order online or visit one of our stores today.


Inputs2 pr. CAST via 4-pin bayonet connectors
2 pr. balanced via XLR connectors
3 pr. single-ended via RCA connectors
Tape input1 pr. single-ended via RCA connector
Main outputs2 pr. CAST via 4-pin bayonet connectors
1 pr. balanced via XLR connector
1 pr. single-ended via RCA connector
Subwoofer outputs1 pr. balanced via XLR connector
1 pr. single-ended via RCA connector
Tape outputs1 pr. single-ended via RCA connector,buffered
Control inputs1 RS-232 input via a 9-pin D-subminiature connector
1 remote IR detector input via a 3-conductor 3.5 mm connector
1 12 VDC trigger input via 3.5 mm connector
1 preamplifier link via an RJ-45 connector
Control outputs2 individually programmable 12 VDC trigger outputs via 3.5 mm connectors
1 preamplifier link via an RJ-45 connector
Power output1 phone power output (±20 VDC) for KPE via a 9-pin D-subminiature connector
Frequency response20 Hz to 20 kHz ± 0.02 dB
0.35 Hz to 720 KHz +0, -3 dB
Single-ended: 8 V RMS
Total harmonic distortion plus noiseBalanced Output: <0.003%, 20 Hz to 20 kHz, 4 V RMS or 4mARMS
Input impedanceCAST: 25 Ohms
Balanced: 40 k Ohms
Single-ended: 20 k Ohms
Output impedanceCAST: >1 MΩ
Balanced: 250Ω
Single-ended: 125Ω
Gain12 dB (CAST or balanced output)
6 dB (single-ended output)
Volume controlBalanced, current-mode, 16-bit, discrete R-2R ladder
Input overloadBalanced, current-mode, 16-bit, discrete R-2R ladder
Output overloadCAST: 16 rnA RMS
Balanced: 16 V RMS
Single-ended: 8 V RMS
Signal-to-noise ratio4 V RMS balanced or 4 mA RMS CAST output
Wideband, unweighted: >100 dB
“N’ weighted: >109 dB
Power consumptionStandby: 60 W
Power on: 65 W
Power on, with KPE: 75 W
DimensionsPreamplifier only:
17.3 in.W x 3.8 in. H x 18.3 in. D
43.8 cm W x 9.7 cm H x 46.4 cm D
Power supply only:
17.3 in. W x 3.8 in. H x 17.7 in. D
43.8 cm W x 9.7 cm H x 44.8 cm D
Preamplifier and power supply:
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
WeightShipped: 61 lbs., 27.6 kg
Preamplifier only: 18 lbs., 8.1 kg
Power supply only: 28 lbs., 12.7 kg


Free Recycle
For Your Old

Reserve & Collect In Store

Free Delivery Australia Wide

In Home Installation & Consultaion

Instant Finance Now Available

Find a lower comparable price online? We’ll beat it!*

RIO Sound and Vision
0 item
My Cart
Empty Cart