Fangrui Product Details Effectively Isolate Ground Loop Noise, Interference Noise Caused By Phase Differences Between Overlong Audio Cables And Different Audio Devices, And Bring You Clean And Lossless Audio. Dual 1/4inch Instrument Balanced And Unbalanced (1/4inch) Direct Box Structure Is Suitable For Stage And Studio Applications. Due To The Ultra-flat Frequency Response Brought By The Permalloy Transformer. The Transformer Also Eliminates And Caused By Ground Loops By Isolating The Input From The Output. Low Noise: The Ground Lift Switch Eliminates Typical Ground Loop Problems. Send The Pass Signal To Your Isolator And Output To The Pa System. Transformer Isolation Eliminates Annoying And Caused By Ground Loops. Safe Hot-swap: Helps Protect The Transmission Between Audio Devices, Preventing Them From Being Burned Out Due To Voltage Differences Or Static Electricity, While Preventing Popping Noise When Plugging Or Unplugging Wires. Dual Channel Input And Output: Free Input Conversion Between Gold-plated 1/4-inch Cables, 1/4-i