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I had this box "just in case" for at least five years without ever needing it but that time finally came and it saved the show. Used it on a laptop output that I had going into my mixer and the shrill hum just disappeared. It finally paid off. I will also place it inline within my sound truck's system on a permanent basis to get rid of a subtle yet mysteriously-sourced hum ahead of the amps--I'm going to get another one for kicks!
Old Synth Enthusiast
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