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equalizer, compressor, noise gate, reverb and other audio
devices. For more information on the channel INSERT
points, see the section, “Using the Channel Insert Jacks” on
page 17 of this manual.
Stereo Input Channels - Line Inputs
You can connect the outputs from stereo devices such as
synthesizers, drum machines, effects processors or any
stereo line-level signal. The LINE inputs have a nominal
operating level of -40dBV through - 10dBV. The 1/4-inch
TRS phone jacks Connector pin-out are as follows; Sleeve:
Ground, Tip: Hot (+), Ring: Cold (-)
D- LEFT MONO
The LEFT MONO jack is used to connect the left output of
a stereo device to the Left input of the MDR’s stereo input
channels or use the LEFT input when connecting a mono
input signal to the Stereo Input channels.
E - RIGHT
The RIGHT jack is used to connect the Right output of a
stereo device to the Right input of the MDR’s stereo input
channels.
MASTER SECTION INPUT AND OUTPUT JACKS
The MDR1248 and MDR1688 features several input and
output connectors allowing you to interface a variety of
external devices. A stereo recording device, such as a cas-
sette recorder, can be connected to the 2 Track jacks, and
power amplifiers or powered monitors can be connected
to the CONTROL ROOM and MAIN output jacks.
F - ALT 3/4 LEFT/RIGHT OUTPUT
The ALT 3/4 outputs are 1/4-inch balanced jacks carrying the
signal from the 3/4 bus. You can assign a channel or a group
of channels to the 3/4 bus using the MUTE 3/4 switch on the
stereo and mono input channels. The 3/4 output connectors
are labeled Left and Right since the 3/4 bus follows the chan-
nels’ PAN control allowing it to be used for a second stereo
MONO INPUT CHANNELS - MIC and LINE INPUTS
Channels 1 through 4 on the MDR1248 and channels 1
through 8 on the MDR1688 are mono inputs, each pro-
viding a 1/4-inch connector for line level signals and an
XLR connector for the MIC signals. Channels 5/6 through
11/12 on the MDR1248 and channels 9/10 through 15/16
on the MDR1688 are stereo inputs, providing a pair of 1/4-
inch connectors for line level inputs. By using the GAIN
control on the mono channels, you can connect a variety
of signal sources from microphones to line level devices
such as synthesizers, and drum machines. All the LINE
and MIC inputs are balanced. The MIC inputs are compat-
ible with microphones with output impedances of 50-
600 Ohms and the LINE inputs are compatible with line
level devices of 600 Ohms. Following below is a detailed
description of the MDR1248 and MDR1688’s input and
output connectors.
NOTE: It is not possible to simultaneously use both the
LINE and MIC inputs on the same channel. Use only one of
the inputs for the appropriate source on each channel.
A - Microphone Input - Mono Input Channels
Use these inputs to connect Low Impedance micro-
phones and low level signals from direct boxes. The MIC
inputs have a nominal operating level of –50dBu through
-20dBu. The MIC inputs also feature +48V phantom
power, allowing you to use condenser microphones. The
Phantom Power switch (located on the MDR1248 and
MDR1688’s rear panel) enables phantom power on all
the microphone inputs when set to the ON position. XLR
Connector pin-out - Pin 1: Ground, Pin 2: Hot (+), Pin 3:
Cold (-)
B - Line Level Input - Mono Input Channels
Use these inputs to connect synthesizers, drum machines,
effects processors or any line-level signal. The LINE
inputs have a nominal operating level of -40dBV through
- 10dBV. TRS phone jacks Connector pin-out - Sleeve:
Ground, Tip: Hot (+), Ring: Cold (-)
C - Insert Point Jack - Mono Input Channels
The MDR1248 and MDR1688’s mono input channels fea-
ture a 1/4-inch, TRS INSERT jack providing a patch point to
connect an external processor. You can use these connec-
tions to interface an external signal processor like an
MDR1248 and MDR1688 Input and Output Connections
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17


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