What is an Impedance Matching volume control?
These devices control the volume from the speaker and present a constant load to the audio amplifier. This means that when you add impedance matching volume controls to your receiver (as long as you follow volume control manufacturers instructions) you will not harm the receiver when you add more than two pairs of speakers. Most impedance matching volume controls will allow you to add up to 16 pairs of speakers to your receiver, but as the number of speakers goes up, the total volume to each speaker will go down.
