Instruction manual

DAC1 HDR Instruction Manual Rev I Page 12
Source Selector and ON/OFF
Switch
The rotary Source Selector control is located
directly to the right of the Input Status
Display. Rotate the knob to select an input.
The rotary Source Selector switch is
equipped with an on/off switch. Press the
control knob to turn the DAC1 HDR on or off.
The ‘ON/OFF’ function features a soft mute
and soft un-mute function that responds very
quickly. Because of this fast response, the
‘ON/OFF’ function also serves as a mute
function. Press the Source Selector switch
to mute all audio outputs. Press again or
rotate to restore all audio outputs.
No analog or digital audio signals are routed
through the Source Selector switch. Source
selection is transparent and free from
crosstalk.
HPA2
TM
Headphone Jacks
The DAC1 HDR features two headphone
jacks. The left-hand jack is equipped with a
switch that automatically mutes the XLR and
RCA analog outputs when a headphone plug
is inserted. The right-hand jack has no
switch. This feature enables seamless muting
of the main outputs when headphones are
being used. This auto-mute feature can be
enabled or disabled via an internal jumper.
Instructions for setting the auto-mute jumper
are detailed in the ‘Internal Settings’
section of this manual.
TIP: Use the left-hand jack to mute your
loudspeaker system. Use the right-hand
jack to keep all outputs active.
The dual jacks also allow two listeners to
monitor and compare notes on what is heard.
When comparing, we recommend using
identical headphones because headphone
sensitivities differ significantly. The Volume
Control adjusts the level for both jacks.
The gain of the HPA2™ is high enough for
the most difficult headphones, but it may be
too high for some other headphones. The
HPA2™ in the DAC1 HDR features three gain
ranges to customize the output level for a
particular set of headphones. These gain
ranges are set using internal jumpers. The
jumpers reduce the input to the HPA2™ by 0,
10 or 20 dB. These jumpers are factory-
installed at 10 dB below full gain. Instructions
for setting the headphone gain range are
detailed in the ‘Internal Settings’ section of
this manual.
TIP: For optimal performance, the
headphone gain jumpers should be set
so that comfortable listening levels occur
when the ‘Volume Control’ is set above
the ‘11 o’clock’ position.