Prowire Aw-imp100wv-b 100-watt Outdoor Impedance-matching Volume Controls With Boxprowire Aw-imp100wv-b 100-watt Outdoor Impedance-matching Volume Controls With Box12-tap, High-grade 100w Auto Former; 100w Max Power Handling Per Channel; Freq Resp: 20-20 KHz +/- 1db; Removable Input/output Terminal Strip; Stereo Control (can Be Used In Mono Applications); Suitable For Residential & Commercial Applications; Knob, Box & Cover Plate Included; 1x, 2x, 4x & 8x Impedance Multiplier; Protects Amplifier By Maintaining Safe Impedance; 1x Position Allows Use In Ordinary Applications; Easy Access Impedance Switch