Excerpt: This item did not clear up any hum in my lines at all. I have a bad ac hum, that I believe is caused by electrical dimmer light switches that run not to far from the shielded speaker cables I am using. With the eliminator in the line, I notice no difference.
Excerpt: I own a big production studio with many synthesizers even vintage ones which mostly given me the hum problems. The best thing about this is, you just plug it in and it knocks the hum out right away without losing sound quality from my synths. Nothing technical.
Excerpt: I used this simple box in line between my roland UA-25EX USB interface and my monitors. I had bad line hum and the ground lift switch on the roland made no difference. The HD400 kills the hum...nuf said!
Excerpt: We are using this item because we find that playing in our band in poorly wired venues. There are ground noise in the facility. We now carry and use this device all the time. It corrects signaling and delivers the correct sound that we are truly looking for.
Excerpt: This product works like it says. Suppresses hum from ground loops. Used it on a noisy DVD player going into the sound board. Completely eliminated all the hum and buzz. Can't speak for it's longevity as I've only had it less than a month. So far, so good.
Excerpt: I've always had trouble with humming in buzzing in my home studio. The combination of an older house and close proximity to a big radio tower probably had a lot to do with it. This simple little device has really done the trick to significantly reduce hum & buzz for both instruments (electric...