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

I’m going to start off by saying , I have a very bad EMI noise issue Between my PC , mixer and other audio equipment. I have hiss/static , whining and digital Hash noise. I bought a cheap £8 ground loop isolator , yes it fixed the noise but it completely ruined the bass , sounded like I blown my drivers and it was soft clipping my mixer Chanels. This one however is absolutely brilliant! The case is made of metal and it has a nice weight to it , the jacks have a nice click to them when inserting the cable which I like. This has fixed 98-99% of the noises I was getting with hardly zero frequency response change , like an extremely minuscule amount which really surprised me! The only very slight niggle I have is the moulded plastic packaging is extremely difficult to open and I had to resort to a Stanley knife which I nearly cut my finger off , just be careful 😂 Here are my personal ratings. Ease of use - 10/10 (very easy to use , plug and play) Device quality - 10/10 (feels solid and has a nice weight to it) Device look - 10/10 (looks professional) Sound quality - 10/10 (no sound changes at all) Noise reduction performance - 10/10 (absolutely obliterated the hiss/static , whining and digital hash noises) Value for money - 10/10 (worth every penny for £14 it’s a brilliant price) Overall , if you have issues like me and want to get rid of the noise that drives you crazy , GET ONE OF THESE!

My use for this is was to try to remove digital intereference commonly noticeable when connecting USB audio interface to a monitoring amp ( or possibly powered monitors ) in a home studio PC / Interface setup. Not so much hum problem but the spitting/crackling data noise, and a sound as if someone is blowing a kazoo in the distance every time the mouse is moved. For me this worked perfectly connecting it between the Interface Line outs and the monitoring amp. No interference / hum whatsoever and, more importantly, no discernable degradation or alteration of the quality of the actual audio signal. I can't say for sure that it will be 100% for all configurations that people have. Hum / interference can be a bit of a dark art, but I can wholeheartedly recommend this based on my own experience. Noise not dropped / lowered etc, but gone completely as would be expected of the use of audio isolating txformers.

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.

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.

Absolute game changer. No noise from external inputs that rely on usb connection and create noise through the pc

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.

I had no earth hum or change of sound output after connecting this between the mixer and amp. I was getting hum from a mic phantom power unit.

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.

Wow. It actually works. I have an old Roland M12E rack mixer and it has a terrible hum because it's old and the way that it's wired causes it to hum when connected to newer equipment. This completely eliminates it.

This killed the humming from my computer graphics card whine. If your GPU starts drawing heavy power your computer will output dirty power to your USB interface causing some buzzing or whining. This eliminated the noise for me. Could be noticed mostly when watching videos, gaming, or using applications that use hardware acceleration

Ich hatte lange mit einem Problem zu kämpfen, das vermutlich jeder kennt, der ein komplexes Streaming Setup mit mehreren Geräten betreibt. Alles ist perfekt verkabelt, alles läuft, und dann ist da plötzlich dieses leise, aber endlos nervige Brummen. Es raubt einem den letzten Nerv, zerstört jede saubere Aufnahme und macht selbst den besten Sound unbrauchbar. Genau an diesem Punkt kommt das Behringer HD400 ins Spiel. Ich nutze das Gerät, um den Sound meiner Konsolen sauber in mein Streaming Setup zu integrieren. Da ich für meine Aufnahmen ein separates Signal für die Nachbearbeitung haben wollte, konnte ich den HDMI Ton meiner Capture Cards nicht verwenden. Außerdem wollte ich absolut latenzfreien Klang ohne digitale Umwege. Also habe ich meine Capture Card direkt mit dem Gaming Monitor verbunden und gehe aus dem 3,5 mm Ausgang des Monitors über ein 1 auf 2 Klinkenkabel in das Behringer HD400. Von dort geht es weiter mit zwei Klinkenkabeln in mein Rode Rodecaster Pro II. Das Ergebnis ist einfach fantastisch. Das Brummen ist vollständig verschwunden. Kein Summen, kein leises Kratzen, keine Masseprobleme. Stattdessen bekomme ich einen absolut sauberen, klaren Sound, der direkt und ohne Verzögerung in meinem Rodecaster ankommt. Ich höre sofort, was passiert, und genau so soll es in einem professionellen Setup sein. Was mich besonders begeistert, ist, wie unscheinbar dieses Gerät aussieht und wie gewaltig der Unterschied ist, den es macht. Man steckt es ein, verdreht ein paar Kabel, und plötzlich ist da diese magische Ruhe. Es ist fast schon unheimlich, wenn man das erste Mal merkt, wie still ein Signalweg eigentlich sein kann, wenn alles richtig entkoppelt ist. Die Verarbeitung ist solide, das Gehäuse fühlt sich robust an und wirkt, als würde es problemlos die nächsten Jahre im Dauerbetrieb überstehen. Kein Schnickschnack, keine unnötigen Knöpfe, einfach ein kompakter Problemlöser, der genau das tut, was er soll. Ich nutze das HD400 inzwischen als festen Bestandteil meines gesamten Audioflusses. Es sorgt dafür, dass meine Konsolen, mein Rodecaster und mein Streaming PC perfekt miteinander harmonieren. Ich kann aufnehmen, streamen und gleichzeitig abhören, ohne auch nur die kleinste Latenz zu bemerken. Mein Fazit: Das Behringer HD400 ist ein unscheinbarer, aber unverzichtbarer Held. Es hat mein Setup leiser, klarer und besser gemacht. Ich wünschte, ich hätte es schon früher gekauft. Ein kleiner Kasten, der großen Frieden bringt. Danke Behringer, wirklich ein geiles Teil.

Had een paar Yamaha HS5 monitoren gekocht die nogal last hadden van mechanische hiss/buzz waarschijnlijk door mijn PC die dichtbij stond. Na verschillende dure kabels gekocht te hebben zonder resultaat dit apparaatje tussen mijn soundcard en de boxen geplaatst en daardoor is het allemaal opgelost en heb ik perfect geluid. Geweldig!

It has done its job. I had a Pyle pro DI, which reduced almost 80% of hum on my ensemble of a mixer, a 75w preamp, Equalizer and 100W front end amp. Now I placed this HD400 just in front of my Guitar like Pros do and it killed all the rest of 20% noise left early. Now on my Line 6 processor, the High Gain with flanger and Tremelo, the Brit tube amp of Slash, was giving problems, when the Fender Twead Ted Nugent and British Clean of Jimmy Hendrix was perfect with no hum. So I reduced the compression on this Slash High Gain Amp model MarshallPlexi and the hum just vanished to give me smooth output. So now the problem is completely solved, I am having a great time with my ensemble of processors and pedals. Thanks, Bheringer for again another satisfaction from your designs.