WCES 2005 - New Product Announcement
• Two megahertz open loop
• Housed in a separate chassis,
the power supply makes use of
extensive electrical and mag-
netic shielding to keep radiated
interference out of critical pre-
amplifier circuits.
bandwidth in a zero feedback,
balanced, Krell Current Mode
and CAST circuitry design.
The Evolution Two
Monaural
Preamplifier
• To eliminate loading effects,
single-ended and balanced volt-
age inputs drive a dynamically-
cascoded JFET buffer, which
has tremendous open-loop line-
arity and very high input imped-
ance.
• Each monaural preamplifier has
a power supply capability equivalent
to many stereo power amplifiers.
• A 170 VA toroidal transformer
drives four 8-amp bridge rectifi-
ers and 39,600 microfarads of
filter capacitance.
• All signal gain is realized in the
current domain using proprie-
tary multiple-output current
mirrors with nearly 500 times
the open loop linearity of other
designs.
• A new Krell-designed digital
control circuit monitors and
optimizes the preamplifier’s
operating parameters.
• Negative feedback is not used
anywhere in the preamp be-
cause it is not necessary. Open-
loop distortion is typically less
than 0.005% (50 parts per mil-
lion).
• Any number of preamplifiers
may be linked and controlled
from a single master, making
high quality, multi-channel au-
dio systems a reality for the
first time.
• The volume control is realized
with a 16-bit balanced resistor
ladder — bandwidth and tran-
sient response of the preamp
circuitry are virtually unaffected
by the volume setting.
• Offered in diamond-cut silver or
luxurious black finish.
The Evolution Series
Expressed through a combination
of breakthrough technologies and
inspired vision, the Evolution Two
Preamplifier and Evolution One
Power Amplifier culminate more
than 25 years of industry lead-
toxicating detail and startling dynamics.
Like live music, this effortless power and
Savor
a totally new
listening experience...
instant response elicit a visceral response
that engages all the senses. Yielding phe-
nomenal power in the most refined man-
ner imaginable, the Evolution system is a
synthesis of almost impossible contradictions; a unique blend of
beauty, grace, and power.
ing audio design. The relentless pursuit of the most realistic
music reproduction is at the heart of Krell design, and this
heart beats strongest in the Evolution. The Krell trademark is
synonymous with music reproduction that fills a room with in-
Krell Industries, Inc. • 45 Connair Road, Orange CT 06477-3650
Krell is a registered trademark of Krell Industries, Inc., and is restricted for use by Krell Industries, Inc., and authorized agents. CASTTM and Krell Current ModeTM are trademarks of Krell Industries, Inc. All other trademarks and trade names
are registered to their respective companies. © 2004 by Krell Industries, Inc. All rights reserved.
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