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Krell Illusion II Preamplifier


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  • Product Description

    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. The 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.

    Analog 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 outputs 1 balanced via XLR connectors 1 pr. single]ended via RCA connectors Download the "Quick Set-up Guide" Headphone output 1 via 3-conductor 6.35 mm (1/4 inch) connector Control inputs 1 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 outputs 2 individually programmable 12 VDC trigger outputs via 2-conductor 3.5mm connectors (30 mA maximum per output) Input impedance Balanced: 40kΩ Single: Ended 20kΩ Output impedance Balanced: 310 Ω Single-ended: 155 Ω Headphone: <3.0Ω Gain Balanced: 12.0 dB 6 dB (single-ended output) Singleended: 6.0 dB Headphone: 5.1 dB with 32 Ω load Volume control Current mode, 12-bit, discrete R-2R ladder Input overload > 7.0 V RMS balanced or single-ended Output overload Balanced: >16 V RMS Single-ended: >8.0 V RMS Headphone: >3.0 V RMS, 32 Ω load Frequency response 20 Hz to 20 kHz +0, -0.02 dB 0.25 Hz to 1.2 MHz +0, -3 dB Total harmonic distortion plus noise Balanced 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 Signal-to-noise ratio 100 dB wideband, unweighted 107 dB "A"-weighted, both referred to 4.0 V RMS balanced Power consumption Standby:

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