Philmore Stereo L-Pad Attenuator for Speaker Volume Control, 100W RMS, 8 Ohms, 3/8" Shaft; LP200 (1) Control speaker volume in home Hi-Fi or commercial sound installations Maintain constant loading on amplifier at all volume settings Recommended for use in tweeter and midrange crossover networks to match individual output levels, while maintaining a constant 8 ohm impedance Mounts in 3/8" diameter hole