FH-201 Audio Filter

This is an audio filter. Model 201. It's designed to clean up audio signals. Connects with RCA cables.The FH-201 is a 12V DC car audio noise filter and ground loop isolator designed to eliminate engine noise, alternator whine, and electrical interference in car stereo systems. It acts as a power supply noise canceller, bridging between the power source and amplifier/speaker to improve sound quality.