DR66 & DR128 Installer User Guide 13
17 REMOTE Connections This provides opto-isolated switch closure inputs and opto-isolated
output lines for remote control, for example using wall plates for volume and patch selection. The
DR66 uses a 25-pin D-type female socket providing 12 inputs and 4 outputs. It also includes the
battery input described above. The DR128 uses a 9-pin D-type female socket providing 8 inputs.
It does not provide any outputs. The remote functions are assigned in a similar way to the front
panel keys and indicators.
18 Line Outputs Low impedance, balanced line level audio outputs are provided on male XLR
sockets. The DR66 provides 6 while the DR128 provides 8. These can drive the long cable to the
amplifier racks typical in most installations without signal loss or interference pickup. The
operating level may be adjusted from the low –10dBV standard to the high +4dBu standard using
the internal trimmers or jumpers.
19 Line Inputs 4 mono line input channels are provided for plugging in unbalanced line level
equipment. Dual RCA phono inputs A and B are provided per channel. These can be used to sum
two different sources into one channel, or to sum a stereo source such as CD or MiniDisc player
into mono, typical in background music zoning. Stereo zoning can be achieved by plugging the left
and right sources into different line channels rather than summing them into one for mono. Input
sensitivity can be adjusted for –10dBV to +4dBu using the internal trimmers or jumpers.
20 Mic/Line Inputs Microphones or line level equipment may be plugged into these balanced
XLR inputs. Professional grade discrete pre-amplifiers convert a wide range of source signals to
the operating level required by the unit. The DR66 provides 2 inputs with internal gain trimmers.
The DR128 provides 8 inputs with recessed rear panel gain trimmers. Internal jumper links can be
configured by the installer for attenuator pad and phantom power requirements.
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