Ultra-compact Hum Destroyer 2-channel Hum Eliminator Noise Filter With 1/4 Inch

Behringer Micro HD400 Ultra-Compact 2-Channel Hum Destroyer Untested

Pyle PHE400 2-Channel Hum Eliminator Ground Loop Noise Filter XLR 1/4" TRS

-PRO Premium Direct Injection Audio Box - Passive DI Unit Hum Eliminator W/ Inpu

Summina Professional Single Channel Passive DI-Box Hum Eliminator Direct Injecti

Pyle PHE400 2-Channel Hum Eliminator Dual Channel Analog XLR 1/4" 20Hz-20kHz

BTS THE-100 Hum Eliminator