The NX-VM80 from NXG is a rotary style volume control for controlling from 2, 4, 8, or 16 pairs of speakers with switchable impedance. This control is easy to install with its small size and removable terminal blocks, which accept up to 14-gauge wire. 12 soft steps of attenuation make it easy to find the proper volume.
Swictable impedance for 2,4, 8, or 16 pairs of speakers