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White rectangular outdoor volume control with rotary knob and weather-resistant enclosure

Monoprice Inc.

Monoprice 138177 100-Watt Outdoor Volume Control

SKU CH-48VW-Z4G5C

Weather-resistant rotary volume control with auto impedance matching supports 100-watt amplifiers for outdoor speaker systems

  • Product typeVolume Control
  • Product weight1.6
  • Key featuresAllows you to connect multiple speaker pairs to a single pow
  • Connect multiple speaker pairs to one amplifier
  • Auto impedance matching protects the amplifier from damage
  • Handles up to 100 watts of amplifier power
  • Weather-resistant enclosure rated for outdoor use
  • Lightweight 1.60 kg design simplifies installation

Outdoor volume control for distributed audio

The Monoprice 138177 is a rotary volume control designed for outdoor speaker installations. It allows multiple speaker pairs to connect to a single power amplifier or receiver. Auto impedance matching protects the amplifier by maintaining a safe overall load. A weather-resistant enclosure makes it suitable for exterior mounting.

Sustained operation with 100-watt amplifier limit

The unit supports amplifiers with up to 100 watts of output power during continuous playback. Impedance matching circuitry actively adjusts the load presented to the amplifier as volume levels change. This prevents overheating or damage during extended listening sessions. The waterproof housing protects internal components from moisture and temperature swings.

Check amplifier power and wiring before ordering

Verify that your amplifier does not exceed 100 watts per channel to stay within the device rating. Confirm your speaker wiring uses conductors suitable for outdoor burial or conduit runs. Ensure the mounting location provides a flat surface for the enclosure seal. The unit weighs 1.60 units, so the mounting hardware must support that mass.

How it compares

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

Price $32.99
Cheaper than about 58% of the 3,838 comparable items (median $41.99).

Specifications

Product
Brand nameMonoprice
Model name138177
Part number138177
Product typeVolume Control

Questions about this item

Does the 100-watt outdoor volume control generate noticeable heat when running all day?

The Monoprice 138177 is a passive rotary volume control with no active electronics, so it produces no measurable heat during continuous operation.

What existing equipment is required for the Monoprice 138177 to function in an outdoor speaker system?

You need a power amplifier or receiver and at least one pair of outdoor-rated speakers; the control connects between them to adjust volume and match impedance.

Will the 138177 work with an older amplifier that has a minimum 8-ohm load requirement?

Yes, the auto impedance matching raises the load presented to the amplifier, protecting older units that require a higher minimum impedance.

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