We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
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.

  • TypeVolume Control
  • ColorMulticolored
  • Weight1.16
  • 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.

Highlights

  • 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

Specifications

BrandMonoprice
Model138170
Part Number138170
TypeVolume Control
ColorMulticolored
Weight1.16
FeaturesAllows you to connect multiple speaker pairs to a single power amplifier or receiver.

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.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.