Subwoofer Lowpass Filter using uA741 Single Op-Amp Ic - EEWeb
Active High Pass Filter
high-pass-filter
Pure subwoofer front plate low pass filter high level input DIY pre tone balanced input / output board|Instrument Parts & Accessories| - AliExpress
Buy Sound Town METIS Series 2400 Watts 18 Powered Subwoofer with Class-D Amplifier, 4-inch Voice Coil, High-Pass Filter (METIS-18PWG) Online in Saint Helena, Ascension and Tristan da Cunha. B098MC89ZN