Speaker volume control operates satisfactorily with 4, 8, or 16 Ohm speakers. There is little heat generated when the control is used, so it can be placed anywhere for convenient operation. Finely adjust each room's volume via pop-free twelve step switch technology. Designed for performance, the VC200 and VC300 deliver attenuation of 34 dB with a frequency of 35Hz to 20kHz plus or minus 0.5 dB. Spring loaded connections for quick installation.