HE-2-XLR Hum Eliminator 2-Channel Box with XLR Jacks

Finally, a product that does what its name implies! I was doing a play at a local middle school. We brought our own audio mixer and plugged its outputs into two channels on the school's rack-mounted mixer which was just off stage. Both of our channels had a significant hum, one much worse than the other. We tried all the usual tricks: making sure all devices had a common power ground; activating the low frequency cut-off filters on all channels; using ground lifters on the inputs; a few other things. Most of those helped, but the hum just would not go away.In a bit of desperation, I bought one of these. I say "desperation" because, in the world of theatre tech, I am learning that if you have a problem with the name "X," and someone offers to sell you something called an "X Solver," or similar label, you are often being offered a way to waste some money.Not this time. The Hum Eliminator eliminated our hum. (You could still hear a tiny bit, probably inherent to our amplifiers, but you had to put your ear on the speaker grille to notice it.)Internally, it is two audio transformers, each with an isolated ground for its primary and another isolated ground for its secondary winding. The result is that your balanced audio signal is passed by induction from one side to the other, but there is no ground path from one side to the other. This is a lot like having a ground lift, but better, because it also doesn't pass any DC bias that might be on the signal lines. There are also a few resistors and a couple of capacitors in the networks, which I believe are for audio shaping (the transformers probably lose a bit more of the low frequencies than of the high ones; it appears to me that the extra components taper off the high frequencies on the output side so that the frequency response of the whole network remains pretty flat).I would also note that the two transformers are mounted at right angles to each other. I believe this is to prevent cross-talk that would otherwise arise from the audio on the primary of one transformer being induced into the secondary of the other transformer. That's the sign of a product made by someone who knows what they are doing.If you know your hum problem originates somewhere upstream of a given point, try inserting one of these at that point. If your hum problem originates downstream of that point, this gadget won't solve it. So, be sure you know where the hum gets into your system. Also, as the included instructions direct, do not put this thing between the output side of an amplifier and your speakers. It's designed for signal power levels only, not amplified levels.It's a good device that solved the hum problems I had.

Designing sound for a production at a local theatre, I was delighted to find that I would be working with first-rate equipment, including a brand new digital mixer. Once I hooked-up the system, though, the nightmare began: There was hum. A lot of hum. Deafening hum.We called in an electrician to verify that the building was properly grounded -- and he said it was. A local music store rented us a "power conditioner" to see if it would make a difference and it did -- but only a slight difference. I then purchased and ran brand new shielded cables. No change.At my wit's end, I found this device on Amazon and thought, "well, if it doesn't work I can always return it..."It worked. Like a charm. Every last bit of hum was removed from the system -- AND the buzz from the stage lighting system vanished, as well! It's amazing. It's magical.My only question is, "Why didn't I know about this sooner?"

Did that attenuate 90% of your noise? It did for me.Unfortunately, it was also a huge performance drop for my PC, and there was still a hint of the old distortion. Obviously, not an ideal lasting solution, but if this works for you, then there's a great chance our noise problems have a cause in common.I have a beefy self-built PC running a USB Scarlett 18i8, which outputs balanced TRS cables to an active Yamaha sub and HS80M monitors. Since the day I unboxed my monitors, they haven't been able to sit quietly, even with nothing happening. There was a constant whisper of a sound, which got worse the more the processing load increased. Move the mouse, buzzzzzzzz. Load a project or flatten something to audio, GRIIIIIIIIIND. Lots of spontaneous distortion on complex sounds and tracks, too.A real nonstop kick in the beanbag, to have so much expensive audio gear make itself sound ugly. If you're here, I'm sure you know the feeling.After years of trying and failing to build a tolerance to the noise, I stumbled on the "Power Saving" trick and finally was able to have an effect on the issue. From a technical standpoint, I still don't know what happens or why (something something ground loop...), but after verifying that particular symptom, it was suggested to try a hum box, so I scooped this one up and crossed my fingers.Welp... it works. Simple as.Passively patched in between my soundcard and my sub, this unit completely scrubbed my signal of all distortions and hum. I was worried about complications from the active sub being on a separate, unconditioned power circuit, but the stages after the eliminator did not reintroduce the noise at all.I see a lot of reviews 1-starring this unit because their interference was caused by something else, so please try the "Power Saving" trick to see if there's a chance that you and I are experiencing the same flavor of problem; if we are, you can feel that much more confident taking a chance on this unit, or one like it.

It didn't work for me. When I plugged my guitar into the box there was more noise.

It's simple, it's effective. I had a *very* nasty ground loop hum that was preventing me from reamping my guitar tracks, and it cut the nasty hum flawlessly. Don't expect a noise suppressor (your high gain channel will still have more noise than your clean channel). This product is for ground loop hum only, and for me it has worked flawlessly. I'm very happy with the EBTech Hum Eliminator.

I had an annoying low level hum and fast ticking sound in my home cinema.I isolated the issue to hdmi cables.I installed the hum buster between my pre-amp and av processor and it solved both issues.Expensive, but it worked.Postage was expensive at £19 from Germany to the UK though.

pushed hum out of the picture good