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.

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, 5ft Note, 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.

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.

Perhaps I got a faulty product, but this was my experience: I connected the inputs of this to balanced TRS cables, with TRS cables on the outputs, connecting one sound desk to another where there's often a ground loop hum. At first, it didn't seem like we were getting any signal, but after turning up the gain to an unnaturally high level (the sort of level that would normally have any microphone feeding back like there's no tomorrow) a signal was coming through. At first it sounded as if it was a much clearer signal than before, but after 5 minutes of listening I noticed that it was completely devoid of all bass. All frequencies below about 200Hz seemed to be just completely cut off. I picked up the box and noticed something else - tapping on the outside of the device (which is quite small, 5.5x10.5x3cm) creates a tapping sound through the whole sound system. It's as if there's a microphone inside that's picking up sound and sending it down the outputs! Also, I thought that a box like this would be quite happy sat as part of a rack mount (obviously it won't mount in a rack itself, but I placed it on top of my Behringer P16i module) and when placed here there was an awful electrical hum. If I moved it away and held it in open space there was no hum. But what good is something for live sound that can't be used in a rack mount?!

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

Quoi de plus énervant et stressant que les bruits parasites générés, entre autre, par les problèmes de masses USB ? Je suis musicien pro depuis près de 30ans, 2 gros studios et au changement d'une de mes cartes sons, quelle ne fut ma pas ma désagréable surprise que ce sifflement permanent, qui plus est, amplifié des que la charge CPU augmentait.... Après quelques recherches, je tombe sur ce petit boîtier. Vu le le prix, je me dit que je n'ai rien à perdre... Effectivement, une fois branché en sortie carte son, en full symétrique, plus le moindre bruit ! Quel soulagement. J'en ai même acheté un second, pour le mettre en sortie de table principale. Idem, signal impec. Si vous, comme beaucoup, vous Rencontrez ce genre de désagrément, foncez, peut prix, maxi efficacité. Juste, branchez bien tout en symétrique pour optimiser encore le résultat

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.