Krell Illusion preamplifier
Kell announces the Krell Illusion preamplifier. An Ideal companion for the new Class A series of iBias power amps , the Illusion preamplifier is a perfect centerpieces for a world class two channel ...
Kell announces the Krell Illusion preamplifier. An Ideal companion for the new Class A series of iBias power amps , the Illusion preamplifier is a perfect centerpieces for a world class two channel audio systems
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.
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.
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 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.
Speak to anyone who knows about high-end audio equipment and amplifiers and one of the brands that will spring to mind is Krell. For over three decades they have been at the top of the industry manufacturing amplifiers that push the boundaries as to what is possible. The KSA-100 was the first high power, high current, Class A biased stereo amplifier and was the product that launched Krell onto the market.
Since those early days Krell has continued to innovate and although their product range now goes beyond amplifiers they still remain at the core of the company’s offerings. Their product line up now includes award winning amplifiers, preamplifiers, SACD players, Blu-ray players, surround sound processors, digital-to-analogue converters and some seriously impressive loudspeakers.
If you’re looking for a high performance amplifier for your sound system or want to take your home cinema system to the next league, then a Krell amplifier is a must have addition. Get in touch today with Oxford Audio on 01865 790 879 to find out more about the Krell range of audio products.