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White rectangular wall-mounted volume control with rotary knob and multicolored faceplate kit

Monoprice Inc.

Monoprice Inc. 138170 50W Rotary Impedance Matching Volume Control With Color Kit

SKU CH-EXXQ-HHASF

A rotary impedance-matching volume control that lets you connect multiple speaker pairs to one amplifier while protecting it from low-impedance damage.

  • Product typeVolume Control
  • Product colorMulticolored
  • Product weight1.16
  • Key featuresAllows you to connect multiple speaker pairs to a single pow
  • Connect multiple speaker pairs to one amplifier without damage
  • Impedance matching protects your amplifier from overload
  • Handles up to 50 watts of amplifier output power
  • Fits standard single-gang low-voltage junction boxes for easy installation
  • Includes a color kit to match your décor

Multi-room speaker volume control

The Monoprice 138170 is a rotary impedance matching volume control designed for whole-home audio installations. It lets you connect several speaker pairs to one power amplifier or receiver while protecting the amplifier from low-impedance loads. The unit ships with a colour kit for aesthetic matching and weighs 1.16 units.

50 watt amplifier power limit

This control supports amplifiers delivering up to 50 watts of output power per channel. Exceeding that rating risks overheating or damaging the internal impedance matching circuitry. The device adjusts the impedance presented to the amplifier so the combined load stays within safe limits for the connected speaker pairs.

Single-gang low-voltage box requirement

Before ordering, verify that your wall locations have standard single-gang low-voltage junction boxes or mounting brackets installed. The unit fits these boxes directly; surface-mount or oversized enclosures will not accommodate it without modification. Confirm your amplifier’s per-channel power does not surpass the supported maximum.

How it compares

Measured against everything we stock in AV Accessories & Components, at today’s prices. Recalculated every night.

Price $26.99
Cheaper than about 63% of the 3,838 comparable items (median $41.99).

Specifications

Product
Brand nameMonoprice
Model name138170
Part number138170
Product typeVolume Control
Product colorMulticolored

Questions about this item

Which model should I pick for a 50 watt amplifier?

Model 138170 is rated for amplifiers up to 50 watts, so it matches that power level directly.

What does the 50 watt rating mean once installed?

It means the control can safely handle the full output of a 50 watt per channel amplifier without overheating or distorting the signal.

What wiring standard does the rotary control use and what does it limit?

It fits standard single-gang low-voltage boxes and presents a safe impedance load to the amplifier, preventing damage when multiple speaker pairs are connected.

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