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White rectangular in-wall volume control with rotary knob and 11 positions

Monoprice Inc.

Monoprice 138164 70V 100W 11-Position Volume Control

SKU CH-KF35-1S5PE

An in-wall volume control for 70V music systems with 11 positions, 100-watt capacity and single-gang fit

  • TypeVolume Control
  • Weight1.12
  • FeaturesAn in-wall, inline volume control for 70V music systems.
  • In-wall volume control designed for 70V music systems
  • 11 rotary positions with make-before-break contacts for smooth adjustment
  • Handles up to 100 watts maximum load without distortion
  • Fits a standard single-gang junction box for easy installation
  • Weighs 1.12 kg for sturdy in-wall mounting

In-wall volume control for 70 V systems

The Monoprice 138164 is a rotary speaker volume control designed for 70 V distributed-audio installations. It handles up to 100 watts of load and mounts inside a standard single-gang junction box. Installers and system integrators use it to set local listening levels without affecting the main amplifier.

Eleven positions with make-before-break contacts

The control provides 11 discrete volume steps using make-before-break switching. This contact design prevents momentary open circuits that can cause amplifier protection trips or audible pops when adjusting the level. The result is smooth, silent transitions between each position during live use.

Verify 70 V line voltage and 100 W load limit

Confirm that your speaker line operates at 70 V and that the total connected load on this control does not exceed 100 watts. The unit fits a single-gang box, so check the available wall depth before installation. It is not suitable for low-impedance (8 Ω) speaker circuits or systems requiring more than 11 attenuation steps.

Highlights

  • In-wall volume control designed for 70V music systems
  • 11 rotary positions with make-before-break contacts for smooth adjustment
  • Handles up to 100 watts maximum load without distortion
  • Fits a standard single-gang junction box for easy installation
  • Weighs 1.12 kg for sturdy in-wall mounting

Specifications

BrandMonoprice
Model138164
Part Number138164
TypeVolume Control
Weight1.12
FeaturesAn in-wall, inline volume control for 70V music systems.

Questions about this item

Will the 11-position rotary switch need replacement after extended use?

The make-before-break contacts on the 11-position rotary switch are designed for durable operation in 70V music systems and do not have a user-replaceable schedule.

What limits continuous output before the 100-watt rating is exceeded?

The 100-watt maximum load is the sustained-use limit; exceeding it risks overheating the internal transformer and contacts.

Does the in-wall unit generate noticeable heat or noise when running all day at high volume?

Passive transformer design produces no fan noise; warmth is normal at high continuous power but stays within safe limits inside a single-gang junction box.

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