Behringer HD400 Ultra-Compact 2-Channel Hum Eliminator, Ground Loop Noise Suppressor for Hi-Fi, DJ, Home Studio and Audio Systems, Passive Design with RCA TRS Compatibility

Great product and worked as expected. Sturdy design and passive so no need for power. I measured before and after and had a 2dB gain loss but didn't alter the frequency response at all from 20hz to 20Khz. Easy to setup and use. Got rid of the hum in my home cinema subs. Great price too.

Stoopid MS1 has a ground loop fit when running off battery power through a converter. This is one example of where this device is brilliant. Keep in mind it doesn't kill all the hum in signal, but it makes it so low you'll miss it.Sturdy little passive box, easy to hide in a set up, No need for external power, 6.3m jacks, two in, two out - off you go!For the money, this is really good. I know you can't chain them to reduce hum further (been tempted to try mad science like that) but I'm sure Behringe'rs intent was to lower to acceptable as opposed to utterly eliminate which you would need a vastly pricier solution.

Good quality build and looks like it will last a lifetime. I needed a solution to digital noise coming through my powered monitors, fed by an unbalanced RCA connection from a Focusrite interface. The HD400 worked a treat, balanced outputs from TRS jacks now connected to XLRs on the monitors - no impact on sound quality but the annoying noise is gone

This product done the job in eliminating static sound but it doesn't make the sound premium for me, as I still get minor hissing when I increase my volume. I bought these as I stream on twitch using a Behringer Mixer (Q802usb) but in my streams I was getting a horrible static background noise so purchasing these cured the sound and lets me listen to both my pcs at a decent sound yet if I was to blast the sound down my headphones it will create hissing and echoing but then I do have a entry level mixer. Overall review is good as it does its job properly but if you want premium quality then upgrade your mixer and hum destroyers.

I had bad feedback on both of my top of the range Pioneer studio monitor speakers connecting to a DJM-A9 Pioneer mixer. This little device took out all the hissing and buzz sounds. Thanks, Love the product, DJ Ben.

I have Yamaha HS5 Monitor Speakers connected via Roland 3ft/1m Interconnect TRS - Male XLR Balanced Cables.These work perfectly on my DJ set up so I knew there was no issue with either.The problem was my Rodecaster Duo. The monitor outputs produce a nasty combination of hiss & hum (which is its only downside and well known) but, the Behringer HD400 cuts that out while still maintaining clean audio quality through my monitors.Excellent product and recommended for Rodecaster Duo users.

I'm an ex home-recording artist, and part time small-time sound engineer, and I got this for two purposes - one of which it will fulfil fine (but rarely), the other (more everyday) definitely not.I was hoping to use this most of the time on my everyday home audio system -- a Mac Mini connected to a pair of very lovely Ruark speakers + CA subwoofer -- which does suffer from significant mains hum. It was often an issue when I was writing/recording (early '90s) so I'm quite sensitive to it. However, to cut a long story short, my system really doesn't sound as good with this thing in it, either at the bottom end, which loses depth and 'roundness' (can't think of another word for it), or at the top, which loses crispness. I swapped it in and out with various favourite tracks -- the difference was starkest on my current favourite album, Billie Eilish's "WHEN WE ALL... etc". I know the sound on that album is really extreme, but this device just took the 'WOW!' out of it. It DID kill the hum, but I won't be using it there.That said, it WILL go in my bag of tricks for going out to 'gigs' (DJ/Dance Classes) because the mains hum in some venues is shocking and distracting, and I'm sure in those circumstances, the net benefit will be considerable. So for "emergency use only" for me.But remember my background is in sound recording, so I really notice shifts in the the 'character' of the sound. If you're less sensitive to that, your sound system less affected, or your favourite music is less extreme in character, it WILL effectively remove annoying levels of hum -- you might well find the benefits outweigh the fairly subtle loss of quality.

Having spent approx 5 hours with my new PC setup trying to find out the source of some very irritating hum on my KRK speakers, I thought I'd give this little device a go. It worked in an instant! To have solved the issue with this device, for only £20, with a fuss-free wire-free solid construction = gold. One of the best purchased I've made! Thank you Behringer!