Monoprice 60-Watts Volume Control With A/B Switch, Connect Multiple Speaker Pairs to a Single Power Amplifier or Receiver

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 60 watts of output power. Fits into standard single-gang low-voltage junction boxes or mounting brackets