Monoprice Speaker Volume Controller RMS 100W (Rotary Type) - White
So two 4‑ohm speakers wired in series is the same impedance as a single 8‑ohm speaker.If using a single pair of speakers rated at the same load level as your amplifier, you don't need to make any changes ‑ just leave the jumper in the default x1 position. When setting up the speaker volume controls, it is important to match the impedance of your speaker system with the load rating of your amplifier.Please note: This volume control does not include a wall mounting bracket.