This site contains affiliate links for which we may be compensated.
Monoprice Speaker Volume Control$25.99
Amplifiers by Monoprice. It increases 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 100 watts of output power and fits into standard single-gang low-voltage junction boxes or mounting brackets.