Kopul XLR Hum Eliminator – Passive Audio Isolation Transformer, Ground Loop Fix

JK Audio Pureformer 600 ohm Isolation Transformer **NEW OPEN BOX**

Pyle Professional High-Performance Passive DI-Box-(1/4''/XLR) Direct Box

AUX to XLR Isolation Box, 3.5mm TRS to 3-Pin XLR Hum Eliminator with Volume C...

Behringer Ultra G GI100 Active Guitar DI-BOX with Speaker Simulation

Neewer NW-12 Desk Top Microphone Sound Isolation Barrier

New DBX DI4 4 Channel Direct Box with Line Mixer

Behringer Ultra-DI DI100 Active Direct Box