Krell Duo 175 Stereo Amplifer XD

Krell Duo 175XD
2 Channel Power Amplifier
175 Watt Amplifier Featuring Krell iBias Technology 

Krell iBias Class A technology allows our latest amplifiers
to run in full Class A mode to full power while minimizing
heat generation.
All signal gain is realized in the current domain using discrete,
proprietary, multiple-output current mirrors with
extraordinary open loop linearity. There are no generic
integrated circuits or op amps used anywhere.
Current mirrors in the final gain stages use a new output
power device that operates at a 73% higher voltage,
delivers almost 10% more current, and offers 120 watts
of additional power handling capability as compared to
previous devices.
The signal path is fully complementary and balanced .
Independent complementary pre driver and driver
stages for the positive and negative output transistors
make the output stages extremely fast and linear.
Krell amplifiers are fully direct-coupled, with no capacitors
in the audio signal path. This design gives the Krell
amplifiers lower internal impedance, which allows
firmer, more precise control of your speakers.
Power Supply Highlights
Two 750VA toroidal transformers feeds amplifier modules
that include the audio circuitry, rectifier, and power supply
filtering mounted to an individual heat sink.
This design shortens the electrical path from the power supply
to the output transistors, reducing the overall impedance
and allowing the circuit to respond faster and control the
speakers better and more accurately.
Feature Highlights
Network connectivity brings convenience, monitoring, and
reporting to end users from any smartphone, tablet, or laptop.
Amplifier configuration options include display brightness
and timeout. For energy conservation, the amplifiers can be
programmed to power off at a preset time of inactivity.
Individual channels can be muted and firmware updates can
be initiated from the web server.
Excessive current, output DC, fan speeds, short circuit, and
overheating are all monitored in real time. Messages are displayed
on the front panel and reported on the web server
interface. Additionally. end users can be sent an email notifying
them of any operational anomalies.

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