Please keep this thread updated as I don’t have Facebook. I have a similar hissing sound but I didn’t use the box. I’ve tried two of those boxes and for me there is some type of issue with the connector. My audio cuts in and out when I use that box. I can grab the connector and when I move it. It cuts out. It’s definitely something with their connector, crimps, pins or something. They blame it on my factory harness but when I bypass that box it works fine other than hissing/static. As I turn up the volume the music mostly drowns it out, but I’d like to get it 100%.
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