Allen Avionics Hum Eliminator Model HEC- 2000

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

ART DTI Dual Transformer Isolator passive 2-Channel Hum Eliminator Ground Loop

Rolls HE18 Buzz Off Hum Eliminator Balanced/Unbalanced Conve Untested As-Is

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

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

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

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