Krell Industries EVOLUTION TWO MONAURAL PREAMPLIFIER - Manual (Page 12)

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(Separate Power Supply continued)
trol circuitry team ultra-stable voltage reference chips with the same discrete high-
current driver and output transistors used in the main analog regulators. These
ample power reserves are brought to the Evolution Two via high reliability 12-pin
connectors with machined, gold plated, three-amp contacts.
Secondary voltage regulators for each analog stage in the Evolution Two provide
ultra-quiet, rock-solid supply rails, as well as complete isolation between all the
analog stages.
When the Evolution Two is placed in stand-by, all the analog circuitry continues to
operate at the same bias current; however, the main analog supply voltages
decrease by 30 percent. The result is a corresponding 30 percent reduction in
power consumption and heat without the need to wait for the electronics to
“warm up” before listening.
Advanced Microprocessor Control
and Custom Software
A user menu allows extensive customization of the preamplifier operation, includ-
ing (but not limited to) input names, input-specific gain trims, Theater Through-
put™, display brightness, and 12-volt triggers. Integration is supported via RS-
232,12 Volt trigger, and RC-5 inputs, as well as an IR transmitter for programming
a learning remote control.
A built-in digital network allows multiple preamplifiers to be linked together, blend-
ing the convenience of a single-chassis stereo preamplifier with the sonic perform-
ance obtainable only from individual monaural preamplifiers. Six or more preampli-
fier channels can be “daisy-chained” together and controlled simultaneously for
multi-zone or home theater applications. The digital link allows the user settings in
one preamplifier channel to be conveniently “cloned” to other linked preamplifier
channels. Similarly, upgraded software in one preamplifier channel can be installed
in other preamplifier channels using the digital link.
In the event that the DC level at any of the preamplifier channel outputs exceeds a
nominal level, sophisticated protection circuitry safely mutes the outputs, traces
the source of the excess DC, and displays a diagnostic message on the main dis-
play. On power-up, the microprocessor verifies that all the circuit boards in the
preamplifier channel are properly connected and are compatible with the version
of software installed.
(SECTION ONE: About Krell continued)