Simple & Powerful Heavy Bass Filter Circuit // You Can Make at Home // Low Pass Filter for Subwoofer - YouTube
Project 155
RC Low pass filter not working - DIY STUFF - Look Mum No Computer Thingies
Simple d.i.y. Low-Pass Filter for Interfacing PMT Amplifier to PC Sound Card (Used with Free “Pulse Recorder and Analyser” Software MCA) – diy Physics Blog
Passive RC low pass filter tutorial! - YouTube
Accidental variable low pass filter | diyAudio
makeRF: An Altoids Tin Low Pass Filter For Shortwave Transmitters