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Top of the line monoblock amplifiers
Price: $ 65,000.00 / Pair
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Warranty and considerations: |
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| Warranty Terms (Parts and Labor) |
5 |
| Mail order? |
This Krell product is not available mail order. If you do not have a local dealer, please contact us, we can usually get Krell to allow us offer you their products |
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The Evolution One amplifier is the result of the unrelenting pursuit of the
most realistic musical reproduction possible in the home. Immensely powerful,
the Evolution One is a monaural design that features a separate power supply for
each channel. Stunning aesthetics hint at the advanced amplifier circuitry
housed within its walls.
The 450 watt Class A circuitry features the latest advancements in Krell
amplifier design including the proprietary Krell Current Mode topology and the
latest versions of the Krell Sustained Plateau Bias and CAST circuitries.
FEATURES
In the Evolution One, the output impedance of the final gain
stages is one hundredth that of the final gain stage in most power amplifiers.
This provides extremely wide bandwidth and very high current capability. The
Evolution One does not employ global negative feedback--the final gain stages
use only 8 dB of local, nested negative feedback. This is one-five hundredth of
the amount used in most solid-state power amplifiers. The result is an
extraordinarily open, liquid, effortless sound.
The rails powering the low level and gain stages in the Evolution One are
regulated twice for total immunity from fluctuations in the AC mains and
virtually noise-free output. All the regulators use current-mode circuitry for
wide bandwidth, low output impedance, and complete immunity to varying load
conditions.
The high-current regulators powering the Evolution One output stages use
fully complementary gain stages and output drivers. The resulting wide bandwidth
and low output impedance of the Evolution One surpasses even the stringent
demands of the amplifier output stages. The driver and output stages in the high
current regulators use 14 pairs of the same robust, high performance power
transistors used in the amplifier output stages. All the regulators are located
in the amplifier chassis to provide ultra low impedance supply rails for the
audio circuitry. Krell alone employs regulated output stages of this nature,
which contribute dramatically to the current capability of the amplifier.
Essentially an amplifier within an amplifier, the complexity and cost of the
Evolution One regulator virtually insures that no other manufacture dare attempt
it.
The new Evolution Bias system features 12 individual bias levels for optimum
performance and efficiency. Evolution Bias constantly compares the audio signal
at the input stage with impedance at the output stage, and adjusts the bias
current accordingly. In addition, a proprietary bias monitor continuously
measures and adjusts the output stage bias, eliminating the need for future
adjustment or calibration.
Housed in a separate chassis, the Evolution One power supply makes use of
extensive electrical and magnetic shielding to keep radiated interference out of
critical amplifier circuits. Internal high current line conditioning circuitry
filters RF noise on the AC mains, as well as compensating for asymmetric power
waveforms and DC on the mains. A dedicated 165 VA toroidal transformer with six
independent secondary windings powers the amplifier's low level stages, gain
stages, and control circuitry. Power for the high current regulators and
amplifier output stages comes from two massive 2500 VA toroidal transformers.
These in turn drive eight 35-amp bridge rectifiers and 120,000 microfarads of
filter capacitance. High reliability connectors with 56 machined, gold plated,
20-amp contacts transmit these tremendous power reserves to the regulators
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