Calibration Trimmers; Ac Power-Entry And Fuse Module - Benchmark DAC1 PRE Instruction Manual

Calibration Trimmers

provide a 2 dB per rotation adjustment with a
total control range of + 9 to +29 dBu at 0
dBFS (full-scale digital input). There are no
stops at either end of the 10-turn rotation.
CAUTION: Do not change the calibration
trimmers unless you have the ability to
accurately measure audio levels.
Factory calibration has been set so that the
output level at the balanced XLR connectors is
+4 dBu at -0 dBFS. This is exactly 20 dB
lower than a typical alignment of +4 dBu at
-20 dBFS. The lower level is appropriate for
most powered monitors.
TIP: To set the XLR outputs to typical
professional studio levels, set the pads
to 0 dB, and set the 'Output Level Switch'
to 'Calibrated'. If the factory settings of
the 'Calibration Trimmers' have not been
changed, the XLR outputs will be
calibrated to +4 dBu at -20 dBFS, and the
RCA outputs will be calibrated to -10 dBV
at -16 dBFS.
The factory-preset levels may be increased by
5 dB or decreased by 15 dB in order to
conform to other studio reference levels. This
range of levels is also well suited for direct
connection to the balanced line-level inputs
on most power amplifiers. Most professional
equipment will work well at these levels.
Note: The Calibration Trimmers have no
effect on the output levels when the Output
Level Switch is set to Variable.
DAC1 PRE Instruction Manual
The Calibration
Trimmers are
located internally on
the circuit board
behind the Output
Level Switch. They
are 10-turn trimmers
and are adjustable
using a small
screwdriver.
These trimmers
Rev J

AC Power-Entry and Fuse Module

The AC power input uses a standard IEC type
connector. One USA-compatible power cord
is included with DAC1 PRE converters
shipped to North America. IEC style power
cords in country-specific configurations are
available in your locality.
Fuse Holder
The fuse holder is built into a drawer next to
the IEC power connector. The drawer
requires two 5 x 20 mm 250 V Slo-Blo
fuses. The drawer includes a voltage
selection switch with two settings: 110 and
220. The fuse rating for all voltage settings
is 0.50 Amps.
The AC input has a very wide input voltage
range and can operate over a frequency
range of 50 to 60 Hz. At 110, the DAC1 PRE
will operate normally over a range of 90 to
140 VAC. At 220, the DAC1 PRE will
operate normally over a range of 175 to 285
VAC.
Caution: Always install the correct fuses.
Always insure that the voltage setting is
correct for your locality.
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