300W Impedance Matching Screwless Rotary Knob Volume Control, Decora Style Wall Plate Snap On, White (Bone, Almond, Black, and Brown available) – SLK-300
All speakers have an impedance rating, typically 8 ohm for a pair of home speakers. To operate in the safest mode, most standard amplifiers and basic two-channel receivers are rated for an 8-ohm incoming load. To operate safely and consistently, the amp needs to see an 8 ohm load, and that’s where speaker selectors and impedance-matching volume controls come into play.