Instruction manual

DAC1 HDR Instruction Manual Rev I Page 13
HDR-VC™ Volume Control
The front-panel HDR-VC™ volume control is
a high-dynamic-range gain circuit built
around a custom-made Alps potentiometer.
The custom Alps pot is equipped with remote-
controllable motor drive.
This potentiometer is equipped with a clutch
which prevents damage from overriding the
motor drive. If the pot is driven beyond the
end of its range, it will not damage the motor.
Also, if the pot is manually overridden, it will
not damage the motor.
The HDR-VC™ volume control always
controls the output level of the headphone
jacks. It can also be used to control the
output levels of the balanced XLR and
unbalanced RCA analog outputs when the
rear-panel Output Level Switch is set to
Variable.
The HDR-VC™ volume control does not
degrade the quality of the audio. It
outperforms digital volume controls, analog
volume IC’s, and passive volume controls. It
maintains dynamic range across a wide range
of gain settings, and introduces virtually no
distortion or noise to the audio.
The XLR outputs have jumper-enabled
passive attenuators that can be used to
optimize the gain structure of the playback
system.
TIP: For optimal performance and
minimal noise, the XLR gain jumpers
should be set so that comfortable
listening levels occur when the ‘Volume
Control’ is set above 11 o’clock.
Instructions for setting the XLR pads are
detailed in the ‘Internal Settings’ section of
this manual. The DAC1 HDR is shipped with
the XLR attenuation set to -20 dB.