Universal 4.1 MLR/Serial

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Product Overview

The Universal 4.1 MLR/Serial is a transparent four input, one output switcher/router with mechanical latching relays designed to pass AES or stereo balanced signals. The Universal 4.1 MLR/Serial is perfect for all types of passive signal switching via front panel switches, contact closures, logic or USB or RS-232 Serial remote control.    Each input features stereo female Neutrik XLR and StudioHub+ RJ45’s connectors. The output features stereo male XLR and StudioHub+ RJ45 connectors. Switching is accomplished via mechanical latching gold contact relays, which means that the unit can route a signal in either direction and will keep routing signal even after losing power. Due to the passive nature of the switching, any input level and impedance can be used. Inputs may be balanced or unbalanced, while output levels, impedance, distortion, noise and balancing will match that of the selected input.

Product Features

  • Front panel channel selection push buttons with active channel LED indicators.
  • The “MUTE” function with LED indicator allows the user to turn off all audio.
  • Front panel Enable switch with enabled LED indicator can be configured to provide a safety lock to the front panel selection push buttons.
  • Signal switching via mechanical latching sealed relays utilizing 2-form-C bifurcated – crossbar silver alloy with gold overlay contacts.
  • Opto-isolated remote control or automation trigger GPI’s via contact closures, 5-volt TTL/CMOS logic levels, USB or RS-232 serial.
  • Four normally open relay contact closures for remote channel status.
  • Stereo Neutrik XLR and StudioHub+ RJ45’s connectors. The RJ45’s conforms to the StudioHub+ wiring standard and pass “DC-LINK” power.
  • Removable euro-block screw terminal connectors are used for remote control connections. Necessary mating plugs are supplied.
  • If power is lost, the last selected channel is passed to the output.
  • Fully RFI proofed.
  • Surge protected internal power supply, 9 VDC universal switching power supply with domestic connector supplied. International connectors optional.
  • Small 1-RU rack chassis.


Automation source switching; Studio selection and routing; Audio processing selection; Exciter input selection; Remote broadcast input selection; STL source selection; Multiple station program on-hold and/or PA switching; EAS audio switching; IFB selection; Satellite audio channel switching and console monitor input and output selection.

Available: Now

List Price: $479.00


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Broadcast Tools, Inc. will be closed in observance of the following holidays: 

New Year’s Day, Tuesday, January 1, 2019
Memorial Day,  Monday, May 27,, 2019
Independence Day, Thursday, July 4,2019
Labor Day, Monday, September 2, 2019
Thanksgiving Day, Thursday, November 28, 2019
Christmas Eve, Tuesday, December 24, 2019
Christmas Day, Wednesday, December 25, 2019