Instruction manual

DAC1 HDR Instruction Manual Rev I Page 17
Unbalanced RCA Analog
Outputs
The Left and Right unbalanced
outputs use standard RCA style
jacks. The ground connections
are bonded to chassis ground
at the location where analog
ground is bonded to the
chassis. This minimizes the
effects of ground loops caused
by AC currents in the cable
shield.
The RCA output levels may be controlled from
the front panel, or may be set to fixed levels
using the internal Calibration Trimmers. In
Calibrated mode the RCA outputs are factory
preset to –10 dBV at -20 dBFS. This is typical
for most consumer-grade equipment. A full
description of the calibration trim controls and
instructions for configuration is located in the
Internal Setting section of this manual.
TIP: Mono summing with an RCA ‘Y’
cable is not recommended as this will
cause high amounts of distortion. Mono
summing with a ‘Y’ cable can be
accomplished with the use of a modified
cable by implementing a 1k Ohm series
resistor in each leg of the ‘Y’.
Note: The XLR pads do not have any effect
on the level of the RCA outputs.
The RCA output impedance is very low (30
Ohms). This makes these outputs well suited
for driving high-capacitance loads and/or
high-capacitance cables.
TIP: The RCA outputs are capable of
driving cables as long as 1360 feet (see
Table 1). But, long un-balanced cables
will generally suffer from hum problems
due to ground loops. We highly
recommend using balanced
interconnects for long runs.
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 HDR 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
®
Type
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
HDR will operate normally over a range of 90
to 140 VAC. At 220, the DAC1 HDR 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.