Internal Settings; Removing Top Cover; Jumpers - Benchmark DAC1 PRE Instruction Manual

Internal Settings

Removing Top Cover

The DAC1 PRE cover must be removed to
gain access to the jumpers. Do not attempt
to remove the faceplate or rear panel.
CAUTION: The DAC1 PRE contains static
sensitive components and should only be
opened by qualified technicians. Static
discharge may cause component failures,
may affect the long-term reliability, or
may degrade the audio performance. Use
a static control wrist strap when
changing jumper settings.
CAUTION:
 Disconnect AC power by unplugging
the power cord at the back of the
DAC1 PRE.
 Remove only the 8 screws holding the
cover (4 on each side).
 Do not remove any screws on front or
rear panels.
 Never remove the power entry safety
cover in the rear corner of the DAC1
PRE.
 Always connect a static-control wrist
strap to the chassis before touching
any internal component.

Jumpers

The following functions are jumper
configured:
 Headphone Gain Range Adjustment
 Headphone Switch Disable
 XLR Output Pads
DAC1 PRE Instruction Manual Rev J
XLR Output Pad Selection (P5, P6,
P7, and P8):
Four 8-pin headers (P5, P6, P7, and P8) allow
selection of the output level at the XLR jacks.
One pair of 8-pin headers controls the output
level at each XLR jack as follows:
 0 dB - (Attenuator disabled) – (Jumper
plug between pins 1 and 2 of each
header)
 -10 dB – (Jumper plug between pins 3 and
4 of each header)
 -20 dB – ***(Jumper plug between pins 5
and 6 of each header)
 -30 dB – (Jumper plug between pins 7 and
8 of each header)
*** = Factory Default
Photo 1 - XLR Output Pad Selection (P5,
P6, P7, and P8 )
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