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

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!

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.

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."

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.

Didn’t work for my needs, but the seller did his job. Thank you.

Did not work for me

Please don’t waste your money. I ordered the device to stop ground hum noise on my guitar amplifier. It did nothing. This is just a very expensive three prong adapter.

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_shareThese 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.