The ISOXL from Whirlwind is a compact line-level isolation transformer that provides an easy way to isolate an audio line when a quick fix is needed. The unit has XLR male and female connectors, and the shield is lifted from input to output.
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I had an issue with buzzing in my setup (which is a bit too complicated to explain here). This transformer cut one of the ground connections and that took care of it. I actually measured its frequency response, and it's only down 3dB at 40Hz, which for my uses (voice) is perfectly acceptable.
Easy to use, eliminated hum