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White rectangular wall-mounted volume control with rotary knob and A/B selector switch

Monoprice Inc.

Monoprice Inc. 138176 60-Watt Volume Control with A/B Switch

SKU CH-MWWR-QV21S

An impedance-matching volume control with A/B switching that lets two speaker pairs share one amplifier up to 60 watts and fits a standard single-gang box

  • TypeVolume Control
  • Weight1.16
  • FeaturesAllows you to connect multiple speaker pairs to a single pow
  • Connect multiple speaker pairs to one amplifier
  • Impedance matching protects the amplifier from damage
  • Handles up to 60 watts of amplifier power
  • Fits standard single-gang low-voltage junction boxes
  • A/B switching selects between two speaker zones

60-Watt Volume Control with A/B Switch

This impedance-matching volume control lets you connect multiple speaker pairs to a single power amplifier or receiver. It presents a safe overall impedance to the amplifier while giving you independent level adjustment. The unit handles amplifiers rated up to 60 watts and mounts in a standard single-gang low-voltage junction box.

A/B zone switching for two speaker sets

The built-in A/B switch selects between two connected speaker zones fed from one source. This replaces the need for a separate speaker selector when you only need to alternate between two rooms or pairs. The jump is worth it when you want simple zone control without adding a multi-zone amplifier or matrix switcher.

Check amplifier power and wiring before ordering

Verify that your amplifier or receiver does not exceed 60 watts per channel into the load this control presents. Confirm you have a single-gang low-voltage box or bracket at the planned mounting location. Ensure your speaker cable runs are terminated for the volume control's terminals and that you only need two zones, as this unit does not support more than an A/B pair.

Highlights

  • Connect multiple speaker pairs to one amplifier
  • Impedance matching protects the amplifier from damage
  • Handles up to 60 watts of amplifier power
  • Fits standard single-gang low-voltage junction boxes
  • A/B switching selects between two speaker zones

Specifications

BrandMonoprice
Model138176
Part Number138176
TypeVolume Control
Weight1.16
FeaturesAllows you to connect multiple speaker pairs to a single power amplifier or receiver.

Questions about this item

Will the 138176 fit in a standard single-gang low-voltage junction box?

Yes, the unit is designed to fit standard single-gang low-voltage junction boxes or mounting brackets for in-wall installation.

How do I wire the A/B switch for two speaker pairs, and what step is often missed?

Connect the amplifier to the common input, wire each speaker pair to the A and B outputs, then set the impedance-matching jumpers for each zone; the step often missed is selecting the correct jumper position for your speaker impedance.

What maintenance or replacement will the 138176 need over time?

The passive impedance-matching circuitry and mechanical A/B switch require no scheduled maintenance; only replace the unit if the switch feels loose or audio quality degrades.

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