Overview:

The McLELLAND MD-50 is a low cost, one-box solution in source selection and zone distribution, which designed to remotely adjust the volume of multiple amplifiers or powered speakers, either individually or in groups. The input of the MD-50 is connected to a PA Mixer’s line-level output(the MD-50 will accept the output of two mixers) and the power amps and/or powered speakers are connected to the MD-50’s zone output.

Features:

Front Panel Features:

  • LEFT and RIGHT sets of balanced SOURCE 1 and 2 INPUTs can also accept a mono signal source or a microphone
  • The SOURCE 1 and 2 INPUT channels are internally routed to the five ZONE channels
  • The FIVE ZONE channels each feature SOURCE 1 and 2 level controls and balanced LEFT and RIGHT OUTPUT connectors
  • A STEREO / MONO input selector button on each zone separates the left and right signals in STEREO mode or combines them in MONO mode so that all signals are present at both outputs.
  • A MONO indicator LED on each zone channel indicates that mono has been selected.
  • CLIP and SIGNAL LEDs on each zone channel indicate the on set of clipping distortion and signal activity.
  • SOURCE 1 and 2 INDICATION LEDs tell you which source channel is processing

Rear Panel Features:


Connection:

1.) Connect the AC power cord to grounded 120VAC socked

2.) Using balanced patch cables connect the balanced stereo output of the primary audio source (mixer) to the MD-50's LEFT and RIGHT INPUT SOURCE 1 connectors.

Alternately a mono signal source or a microphone may be connected to either the L or R input. However this may affect stereo operation. You may repeat the process with INPUT SOURCE 2 for and additional mixer or other audio source.

3.) Using balanced (or mic) cables, connect the MD50 OUTPUT ZONE connectors to the inputs of the appropriate power amplifiers and/or powered speakers.

4.) In most operating situations the MONO/STEREO input button would be in the MONO position. There are two reasons for this.

Firstly, stereo separation works well in the home where the listener can be situated more exactly between the speakers to hear each one equally. But away from that environment in a club,restaurant,office rec hall,etc.listeners too often find themselves closer to one speaker than the other.

Secondly If you connect a mono source or a microphone to one of the left or right SOURCE INPUT connectors then switch one or more zones into STEREO, that source will only come out the amp/speakers connected to the left or right zone outputs. People not situated close to those speakers may not be able to hear that source at all.

5.) Adjust the SOURCE level controls or the output of the signal source to prevent distortion

6.) The SIGNAL light each ZONE indicates the presence of input signal there. SOURCE INDICATOR 1 and 2 lights tell you which INPUT SOURCE is receiving signals.

Sample Set-up (Drawing Figure)


Specifications: