BehringerHD400 Ultra Compact 2 Channel Hum Suppressor

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

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!

I'm leaving this review for anybody who is wondering if this might solve the rather obscure problem that I had and what I wanted to use it for (couldn't find anywhere online to confirm if this would work for me or not pre-purchase).I have a mini home studio with a mixing desk being at the source - I use a DSLR camera (as a webcam) and wanted to run my XLR condensor mic through it, via the mixing desk, for better lip synch on live calls. When connecting the camera to the mixing desk (by using a dual TRS 1/4 inch to 1/8 inch cable) there was an awful ground loop hum. Very loud and made it untenable. I ordered this hum destroyer and hoped for the best....I can confirm that this worked a treat and almost completely removed the ground loop hum when connected between the camera and mixing desk (you'll need an extra dual TRS 1/4 inch to 1/8 cable to do so - making it two in total) - only a very faint/quiet (and non-problematic) noise remains in the deep background, which you can take or leave. Good enough for me and exceeded my expectations at this price.If you happen to be trying to eliminate the same problem, I can confirm that this works. Decent little product for a fair price.

I had an awful amount of noise in my right speaker that was coming from my laptop when it was connected to my audio interface.Adding this box between my interface and thr speakers got rid of it completely with no loss of volume or audio quality.I'm really happy and so impressed by it, I would recommend it to anyone facing similar issues with their setups.Simple to connect, good quality, takes up a tiny amount of desktop space and for the price it provides great value.

I was suffering terrible noise problems on my PC audio setup which uses a USB DAC attached to some M-Audio active monitor speakers. It was both a low pitched background hum, and high pitched noises which were a bit like the sound of an old dial up modem, which were coming from the PC. An extremely frustrating problem, which I understand is caused by a ground loop.This little passive box worked perfectly, and to my ears, without degrading the sound at all. Low, mid and high frequency's seem excellent to me. It does lower volume slightly, but no problem. But the main thing is noise is now a thing of the past.The box is quite light but seems reasonably well made, and all metal. The connections on it are all of the 1/4 inch (6.35mm) "phone jack" type, and it converts unbalanced input to a balanced output.I used it with some of these cables to run from the MicroHD to my speakers - HosaTech STX-105M Connection Cable 1/4 inch TRS to XLR3 Male, Balanced, 5ftNote, it is not intended for solving hum issues on electric guitars - do not buy for that purpose. It is for hum induced by ground loops and fits between say a mixer and an amp, or between a DAC/audio interface and active speakers.

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.