The Pyle Compact Mini Hum Eliminator Box (PHE400) is a 2-channel noise filter and ground loop isolator designed to eliminate AC buzz and unwanted hum from audio systems. Perfect for use with home audio equipment, mixers, and musical instruments, this compact device reduces interference and ensures high-quality sound performance. Whether you're in the studio, at a live show, or recording, the PHE400 ensures noise-free audio without the need for additional power sources. | Pyle | | Compact Mini Hum Eliminator Box, 2-Channel Noise Filter, Ground Loop Isolator, AC Buzz Killer | PHE400 | Best Buy