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 volume control with rotary knob and color kit

Monoprice Inc.

Monoprice 138172 100W Rotary Impedance Matching Speaker Volume Control with Color Kit

SKU CH-7F65-EESJG

Matches speaker impedance to protect amplifiers up to 100 watts while controlling volume from a standard single-gang box

  • Product typeVolume Control
  • Product weight1.18
  • Key featuresAllows you to connect multiple speaker pairs to a single pow
  • Connect multiple speaker pairs to one amplifier
  • Impedance matching protects amplifier from damage
  • Supports up to 100 watts amplifier power
  • Fits standard single-gang low-voltage junction boxes
  • Lightweight 1.18 unit installs easily

Impedance Matching Volume Control

The Monoprice 138172 is a rotary impedance matching speaker volume control designed for whole-home audio systems. It allows you to connect multiple speaker pairs to a single power amplifier or receiver safely. The unit adjusts the impedance of each connected pair to protect the amplifier from damage due to low impedance loads. It supports amplifiers with up to 100 watts of output power per channel.

Standard Single-Gang Installation

This volume control fits into standard single-gang low-voltage junction boxes or mounting brackets for in-wall placement. It integrates into existing electrical infrastructure without requiring specialised enclosures or oversized cutouts. The rotary knob provides local volume adjustment for the connected speaker zone. A color kit is included to match common decorator wall plate finishes.

Passive Operation and Thermal Profile

The device operates passively without external power, adding no active heat or noise to the installation. Impedance matching is handled by internal autoformer circuitry that presents a safe load to the amplifier at all volume settings. Insertion loss is minimal and typical for this class of passive volume control. The 1.18 lb weight reflects the robust transformer construction required for 100 watt power handling.

How it compares

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

Price $27.99
Cheaper than about 62% of the 3,838 comparable items (median $41.99).

Specifications

Product
Brand nameMonoprice
Model name138172
Part number138172
Product typeVolume Control

Questions about this item

What is the maximum amplifier power this volume control can handle before it becomes a limiting factor?

The unit supports amplifiers rated up to 100 watts of output power, which is the highest continuous power level it is designed to accommodate.

How much heat or noise does the impedance matching circuitry produce when the system runs all day?

The device is a passive rotary control with no active electronics, so it generates no audible noise and negligible heat during extended operation.

What existing wiring infrastructure must be in place for this control to install and function?

It fits a standard single-gang low-voltage junction box or mounting bracket, so that box and the speaker cables from the amplifier must already be present.

More in AV Accessories & Components

Similar items