Samson SAMDR1248 Manuale Utente

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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.

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 (-)

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.

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 

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.

 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