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100 Watt 70/25 Volt Volume Control with Metal Plate

100 Watt 70/25 Volt Volume Control with Metal Plate

10 Position | 33dB | Solderless | Single Gang | Stainless Steel

Item # 15-111-156
Sale Price $27.29
1 - 9 10 - 14 15 - 24 25 - 99 100+
$27.29 $25.99 $24.69 $23.39 $21.99

Volume controls are a great way to control one or many speakers from one location. This professional quality volume control provides low insertion loss, excellent frequency response, and a reliable performance. The 100 watt volume control supports both 25 and 70.7 volt audio systems. It features a stainless steel plate with stamped and filled numbers. The heavy duty black plastic knob features 10 attenuations steps. To prevent damage, this control has no stop between off and the 10th position. This volume control fits into a single gang mounting box and includes all required mount screws. 70/25 volt volume controls are typically used for public announcement and background music systems.


  • Stainless steel plate
  • Rotary knob
  • 10 Position
  • Total Atenuation: 33dB
  • Power rating: 100 watts
  • Use up to 16AWG wire
  • Solderless
  • Single Gang
  • Dimensions: 2-1/8in H x 1-3/4in W x 2-1/8in D
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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 install of 3 or less speakers.

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