Resonant low pass filter with a separate 3-position Q switch. Medium and high Q levels can be set with onboard trimmers. This is the filter only, requires an SQ Switch and W3 cable.FS Switched Q FilterSKU: FS$50.40PriceQuantity*Add to CartSpecificationsResonant Peak Frequency: 130-5300 Hz. Medium Q Boost Trimmer: 0-13 dB. High Q Boost Trimmer: 0-13 dB. Idle Current: 0.68 mA. Board Dimensions: 35.2 x 21 x 7.5 mm. Pot Shaft: Round, D=6mm, L=10mm. Pot Bushing: M7x0.75, L=10mm.