MCM Electronics

Automatic A/B Line Level SwitchMCM Part #: 50-8385  |  Speakercraft Part #: LL-ONE

Automatic A/B Line Level Switch 4.8 stars from 4 ratings and 3 reviews.
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Automatic A/B Line Level Switch
This switching device automatically selects between two line level sources to a single amplifier input. RCA female input/output connections accommodate left and right channels, making it perfect for all consumer electronic devices.

Note: This unit requires 12VDC, AC adapter sold separately, MCM Model #50-8362.

Product Description

Default Input–A is selected when no signal is present. When a signal is sensed at Input–B, the selector automatically switches to that input. A separate 12VDC, 100mA signal is also provided to trigger other external devices.

Trigger sensitivity is fully adjustable from 10~100mV. Off delay (from B back to A after absence of signal) is adjustable in eight steps from 0.5 seconds to 10 minutes.

Product Reviews

  • "Garry" by Bridge City Games on 10/26/2012
    Overall: 5 out of 5

    this item we have bought in the past and had very good success with

  • "electronics tech" by JEFFALLENDORF on 6/8/2011
    Overall: 4.5 out of 5

    very good product easy to use...needs to come with power supply

  • "Good switch." by jkliquid on 4/20/2010
    Overall: 4.5 out of 5
    Top 10 Contributor

    Works very well.

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Package Specifications & Dimensions
Weight:0.32 lbs.
Warranty:1825 days
Need to Return?
Length:5 in.
Width:4 in.
Height:1.5 in.
Shipping Information
Extra Shipping Charge:No
Drop Ship:No
Catalog Pages

MCM Cat 57, Page 231

MCM Cat 56, Page 033

PDF Reference

Requires Adobe Acrobat Reader.

Mfr. Info

Speakercraft Logo
Mfr. Name:Speakercraft
Mfr. Part Number:LL-ONE
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