Monoprice

Monoprice 138178 OVC300 Outdoor Volume Control

4.1 (56 reviews)

Optimize Your Outdoor Audio Experience The Monoprice OVC300 Rotary Volume Control is engineered to connect multiple speaker pairs to a single amplifier. Its impedance matching feature ensures amplifier protection while supporting up to 300 watts. Encased in a weather-resistant enclosure, it's per...

$43.99*$54.99Save 20%
In Stock on Amazon.com
View on Amazon

*Price sourced from Amazon.com. Last updated:Jun 28, 2026.Price and availability are subject to change.

Affiliate Disclosure: Studio Supplies may earn a commission from qualifying purchases made through links on this page, at no additional cost to you. This helps support our editorial team.

Notice a mistake? Let Us Know

Overview

Optimize Your Outdoor Audio Experience

The Monoprice OVC300 Rotary Volume Control is engineered to connect multiple speaker pairs to a single amplifier. Its impedance matching feature ensures amplifier protection while supporting up to 300 watts. Encased in a weather-resistant enclosure, it's perfect for outdoor use.

  • Connects multiple speaker pairs to one amplifier or receiver
  • Impedance matching protects the amplifier from damage
  • Supports amplifiers with up to 300 watts of power
  • Waterproof enclosure for outdoor applications

Specifications:

  • Product Dimensions: 4.9 x 4.3 x 6.2 inches
  • Item Weight: 1.6 ounces
  • Model Number: 138178
  • Color: Black
  • Material: Plastic
  • Model Name: OVC300
  • Power Source: Corded Electric
  • Brand: Monoprice
  • Country of Origin: China

Key Features

Allows you to connect multiple speaker pairs to a single power amplifier or receiver.

It increases (or decreases) the impedance of the connected speaker pair to ensure that the overall impedance level presented to the amplifier is high enough to prevent damage to the amplifier.

It can support amplifiers with up to 300 watts of output power.

Has a waterproof enclosure.

Used in outdoor applications.

Specifications

Function
Outdoor Volume Control
Connectivity
Multiple speaker pairs to single amplifier/receiver
Amplifier Compatibility
Up to 300 watts of output power
Protection Feature
Impedance matching for amplifier protection
Enclosure Type
Waterproof
Application
Outdoor applications

Pros & Cons

👍 Pros

  • Allows connection of multiple speaker pairs to a single power amplifier or receiver, expanding audio distribution.
  • Increases or decreases the impedance of connected speakers to protect the amplifier from damage.
  • Supports amplifiers with a robust output power of up to 300 watts, accommodating powerful audio systems.
  • Features a waterproof enclosure, making it suitable and durable for outdoor audio applications.
  • Designed for use in outdoor environments, ensuring reliable performance in various weather conditions.

👎 Cons

  • Specific impedance matching specifications (e.g., how much it raises/lowers impedance) are not provided.
  • The number of speaker pairs that can be connected is not explicitly stated, only "multiple speaker pairs."
  • While waterproof, the specific IP rating for water and dust resistance is not detailed.
  • The physical dimensions and mounting requirements for the waterproof enclosure are not listed.
  • Does not include any sound equalization or signal processing features beyond volume control and impedance matching.

Frequently Asked Questions

The Monoprice OVC300 is an outdoor volume control that allows you to connect multiple pairs of speakers to a single power amplifier or receiver while providing individual volume adjustment.
It increases or decreases the impedance of the connected speaker pair, ensuring that the overall impedance level presented to the amplifier is high enough to prevent potential damage.
This outdoor volume control is designed to support amplifiers with an output power of up to 300 watts.
Yes, the Monoprice OVC300 features a waterproof enclosure and is specifically designed for use in outdoor applications.
Yes, it allows you to connect multiple speaker pairs, making it versatile for expanding your outdoor audio system from a single amplifier source.
No, its primary functions are volume control and impedance management for amplifier protection; it does not include additional audio adjustments like equalization.