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50 Watt Sliding Impedance Matching Volume Control - Ivory

50 Watt Sliding Impedance Matching Volume Control - Ivory

Used with 3+ Speakers | 11 Position | 39dB | Solderless | Single Gang

Item # 15-111-142
Sale Price $23.09
1 - 9 10 - 14 15 - 24 25 - 99 100+
$23.09 $21.99 $20.89 $19.79 $18.69

Volume controls are a great way to control one or many speakers from one location. This impedance matching volume control supports up to 100 watts per channel. Impendence matching volume controls ensure that the impedance load shown to the receiver or amplifier never goes below the rated capabilities. Impendence matching volume controls are typically used with 3 or more speakers, or where impedance matching is required. This volume control can support up to 16 pairs of speakers.


  • Color: Ivory
  • Sliding
  • 11 Position
  • 39 dB of attenuation
  • Impedance matching
  • 1x, 2x, 4x and 8x settings
  • 100 watts maximum peak power
  • 50 watts continuous power
  • Use up to 14AWG wire
  • Solderless
  • Single Gang
  • Dimensions: 4in H x 1-1/2in W x 3-1/2in D (depth in wall: 3-1/2in)
  • Decora plate included
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Q: What is impedance?

Impedance is the effective resistance of an electric circuit or component to alternating current, arising from the combined effects of ohmic resistance and reactance. Impedance is measured in ohms.

Q: What is an ohm?

The ohm is the unit of measure for impedance, which is the property of a speaker that restricts the flow of electrical current through it. Typical speakers have impedance ratings of 4 ohms, 8 ohms or 16 ohms.

Q: Why should I worry about speaker ohms?

If you connect your amplifier to the wrong speaker impedance, you risk damaging the amp. In tube amps, too high a load impedance (or a disconnected load) can result in damage to the output tubes or output transformer. In solid state amps, if the speaker impedance is too low, the amplifier will tend to overheat and more power is used up in the amplifier than is delivered to the speaker. Too many speakers on a solid state amp can burn up the power output section.

Q: Why should I use an impedance matching volume control?

Normally, most amplifiers can easily drive between four and 16 ohms of speakers. With each speaker added to an amplifier, the impedance level drops by half. If you hook two 8-ohm speakers up to an amplifier in parallel, the amplifier actually sees an equivalent resistance of 4-ohms. Hooking three pairs to one amplifier, the equivalent impedance is 2.6 ohms, which is too low for most amplifiers to operate properly.

When this Impedance Matching Volume control is used between a set of speakers and an amplifier, the volume control can set a higher impedance level (typically 8 ohms) for the amplifier to see. Once all the higher impedance volume controls are added up, you're back to a safe level for your amplifier.

Q: Why should I use a resistor based volume control?

Resistor based volume controls typically have the widest frequency range of any type of volume controls. This results in virtually no high or low end roll-off which delivers excellent sound quality. However, resistor based control cannot correct impedance mismatches. Because they cannot correct impedance they are typically only used for installs of 3 or less speakers.

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