The Illusion II is the perfect centerpiece for a world class digital and analog audio system. Added to the normal selection of balanced and single- ended inputs are five digital inputs. The digital module features AES/EBU, coaxial, and optical digital inputs for use with streaming devices or other digital sources.

Circuitry Highlights

The Illusion II preamplifier is a dual monaural design with the left and right channels afforded their own power supply regulation and individual circuit boards. All signal gain is executed with surface mount technology using proprietary multiple-output current mirrors with nearly 500 times the open loop linearity of other designs. Featuring 700 kHz bandwidth in a zero feedback, balanced, Krell Current Mode design, the Illusion II shares the same design philosophy as its bigger brother, the flagship Illusion preamplifier. 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. 7c-Krell-IllusionPreamp_ProductOverviewLayout.pngThe headphone circuitry is identical to the main circuitry, offering private listening with the same performance as speaker playback.

Digital Module Highlights

The digital module supports up to 24 bit/192kHz LPCM. All digital signals are fed to an ESS Sabre DAC and then sent to Krell’s Current Mode, discrete, balanced analog circuitry.

Power Supply Highlights

Oversized for a preamplifier, the power supply features a 95 VA transformer  and 40,000 µF of capacitance giving it the ability to respond quickly to musical demands. The large power supply improves noise rejection and renders the Illusion II impervious to all but the most severe AC voltage power fluctuations. A new eco-friendly standby mode reduces power consumption 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.


InputsAnalog Inputs
2 pr. balanced via XLR connectors
3 pr. single-ended via RCA connectors

Digital Inputs
1 AES/EBU via XLR connector
2 coaxial via RCA connectors
2 optical via Toslink connectors
Main outputs1 pr. balanced via XLR connectors
1 pr. single-ended via RCA connectors
Headphone output1 via 3-conductor 6.35 mm (1/4 inch) connector
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 2-conductor 3.5 mm connector
Control outputs2 individually programmable 12 VDC trigger outputs via 2-conductor 3.5mm connectors (30 mA maximum per output)
Frequency response20 Hz to 20 kHz +0, -0.02 dB
0.25 Hz to 1.2 MHz +0, -3 dB
Total harmonic distortion plus noiseBalanced Output: <0.003%, 20 Hz to 20 kHz, at 4.0 V RMS
Headphone: <0.09%, 20 Hz to 20 kHz, 2.0 V RMS, 32 Ω load
Input impedanceBalanced: 40kΩ
Single-ended 20kΩ
Output impedanceBalanced: 310 Ω
Single-ended: 155 Ω
Headphone: <3.0Ω
GainBalanced: 12.0 dB
6 dB (single-ended output)
Single-ended: 6.0 dB
Headphone: 5.1 dB with 32 Ω load
Volume controlCurrent mode, 12-bit, discrete R-2R ladder
Input overload> 7.0 V RMS balanced or single-ended
Output overloadBalanced: >16 V RMS
Single-ended: >8.0 V RMS
Headphone: >3.0 V RMS, 32 Ω load
Signal-to-noise ratio100 dB wideband, unweighted
107 dB ”A”-weighted, both referred to 4.0 V RMS balanced
Power consumptionStandby: <2 Watts
Power on: 40 Watts
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
WeightShipped: 38 lbs., 17.2 kg
Preamplifier only: 23 lbs., 10.4 kg


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