Ebtech Hum X - Plug-Style AC Voltage Ground Loop Hum Eliminator + Cleaning Cloth

Bought two of these to use as needed for my Marshall and BlackStar amplifiers. Makes my amps quiet as a mouse.

Long story short, you need properly grounded plugs in your home or studio or spend tons on a luthier to rig your guitar or bass. This thing did jack and squat to stop any hum.

This device did the trick for eliminating my ground loop issue with my audio system. Seemed a little pricey but when I considered what I have invested in the audio equipment, it’s peanuts! Absolute silence now (from a tube amplifier, to boot) so extremely happy. I highly recommend PSAudio troubleshooting guides for step-by-step isolation of these type issues. But, caution: this device does not act EXACTLY like a cheater plug. A cheater plug is a great way to see for free if this might work and if you have a ground loop problem at all but I had to move this device from the pre-amp to the power conditioner wall plug and separate the power amp to a different wall plug for the ultimate final solution. Just saying, if it doesn’t work just like the cheater plug don’t give up. Try moving it around. I’m no electrical engineer so I can’t tell you how or why it works or even exactly what my issue is. Guessing it’s in the power conditioner. Also, before I used this, I had added a $10 cable line filter that took care of half the issue, so if you have a TV cable line in the house I recommend that as well. That’s the first place my audio dealer and the PSAudio guides will tell you to look because cables are notoriously dirty. Haven’t really tested whether I can now eliminate the cable line filter since I have this but I know the cable line is a contributor so leaving it. It’s silent. I’m thrilled. Not touching it. Time to spin to some vinyl!

I've had 3 other tube amps that didn't have this problem. Then I got a used Revv G20 with the built-in digital cab sim tech. I run stereo amps with a lot of pedals and rack EQ. I have several signal splits, including a dry signal to the interface to use for reamping. The G20 was picking up an annoying high-pitched whine. I thought I was gonna have to return it. But I got the Hum Exterminator and it removed the whine. It didn't remove the usual amp hum, but the hum on this amp is nowhere near as bad as it is on a Peavey Invective MH (lots of hiss) and a Marshall DSL20CR (loud hum, even on clean). The problem is, it's $80, and I should get one for every device in my studio that plugs in. I've also spent $120 on just 3 isolation transformers w/ground lift to cut the ground loops, and I probably still need 6 more. That's a LOT of money to reduce noise. Most of my noise is RF/EM and this plug will do nothing for that. It's just really polluted in this apartment. My active pickups are quiet on high gain at the guitar store but very very noisy at home.

I bought one if these and it didn't work to reduce electrical noise in my tube guitar amps. I bought an outlet tester on Amazon for less than $10 and come to find out, I have an open ground in this entire house (which essentially means no ground for three prong) So I googled it. "No, a Hum X (ground loop eliminator) will not work effectively if you have an open ground because its primary function is to filter out unwanted voltage on the ground line, which is impossible if there is no ground connection at all; essentially, it needs a ground loop to work, so an open ground defeats its purpose and could potentially create safety concerns by "floating" the ground without properly grounding your equipment."

The product worked as described. Be sure the problem is in fact a ground loop. There are various ways to confirm. Also you may need more than one device if you have several devices that are grounded. I like that these are made in the US. I didn’t like the size of the plug. One hum x blocked access to three receptacles on my surge protector. I planned to use two hum x which would have eliminated more than half the capacity of the surge protector. I found another white colored device that is ingeniously designed for direct connect to the iec block on the back of my components. Footprint problem solved! Though those products do cost $20 more. I received The Morley hum eliminator not the hum x pictured. Though I was able to confirm that they are one and the same.

This is for having power connected within the same circuit, ground loop feedback issues can arise and this solves protecting your subwoofer by isolating the feedback as it draws a lot of power. The majority choose to connect it directly into a single outlet on the wall plate. Or on other cases it has its many other purposes such as mobility and adaptive use as not all locations either in home or on the move have access to separate circuits. Now as I found in my own situation I have multiple sound systems connected together which are also using 3.5mm bi-directional isolators which I found here: Ground Loop Isolator for Car... https://www.amazon.com/dp/B09QPRKTDL?ref=ppx_pop_mob_ap_share These are useful as they will prevent any multiple systems using the same split input output setup or whatever it is that’s creating feedback, hum, crackle, etc… My advice for those that left bad reviews and those tackling their issue is to start from the ground up, pun intended. This means start from the sub, system(s), then main source, not the other way around as most will do (I did). Also rca, binding posts (bare wire), can be adapted to 3.5mm to make everything easier to connect isolators. And a tip for the 3.5 isolators is to make sure it’s connected to the output of the device between it and the speakers. Otherwise I feel confident my not so cheap subwoofer is protected with this connected directly to the first outlet of a surge protector giving me a double fused peace of mind knowing I won’t worry about blowing a fuse, yes pun intended, so I hope this helps.

I built a new PC and for some reason, the noises coming from my studio monitors for my DAW (Digital Audio Workstation) were just ridiculous. Some friends on a DAW/music group site suggested this little miracle and MAN! was it indeed the miracle! I was able to plug JUST my PC into it (which was what was - for reasons unknown, generating the weird noises) and THEN plug the Ebtech Hum-X into my UPS (Uninterruptible Power Supply, which was plugged into the wall socket) and NOISE GONE! I mean really gone. I tell ya - my tinnitus (not life-altering for the most part) is all I hear now. Can't believe how such a tiny little device can do so much! Buy - you won't be disappointed if you've had issues with a noisy workstation or whatnot. :-)

Tried it on a few products I had that were humming but it did nothing. Save your money and look for something else.

Does what it supposed to do.

It should probably say in the product description that this product is not intended for subwoofers or amplifiers. It says that on the packaging, but you don't see that until after you receive it, which results in wasteful returns. I did try it on my amp and on my sub, but it simply didn't do anything. They were emitting a very low hum which I believe is part of their natural operation, or perhaps a result of an impure power source.

It was that simple