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!

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'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.

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

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.

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.

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

自宅でアンプヘッドとエフェクターとを切替えて使用するシステムにてグランドループノイズで悩んでましたが、この機材通して組み直したら一発で解消されました。 似たような機材が見当たらなかったので大変ありがたかったです。

Od wielu miesięcy męczyłem się z szumami/piskami w monitorach (nasilały się przy obciazaniu karty graficznej - im więcej fps generowala, tym głośniejsze i wyższe były częstotliwości). Po przepuszczeniu sygnału monitor - reduktor - interfejs, problem zniknął. Serdecznie polecam.

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.

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.