PYLE-PRO Compact Mini Hum Eliminator Box-2 Channel Passive Ground Loop Isolator, Noise Filter, AC Buzz Destroyer, Hum Killer w/ 2 1/4-Inch TRS Input and Output for 2 Mono /1 Stereo Signal

Compact and perfect for my install. I had a rack of older unbalanced synths I needed to connect to my mixer using a balanced snake. I had a ground loop issue causing hum on 4 synth units plugging directly into the TRS snake that was going to balanced returns on the board. The accumulative hum was bad and annoying, that was a total of 8 channels of hum. I grabbed one of my much more expensive hum eliminators ($80.00) and it removed the hum in one unit. I needed 4-2 channel units and 4 of those would have cost $320.00. These units would only cost roughly $60.00 for 8 channels. I ordered the Pyle Hum Destroyers on Amazon and they arrived the next afternoon. I did a side by side audio comparison test with the more expensive unit, and the results were the same. Zero hum, and in addition like the more expensive unit the Pyle also automatically converts the unbalanced output connections of the synths to balanced out to the board. I found that using a TS cable from the synth actually works better than using a short TRS patch cable which I tried first. The 2 ft. TS cables from the rack mounted synth to the Hum Destroyer worked best, the TRS cable still had a very small amount of hum most likely due to the internal unbalanced jack configuration of the older synth. These were JV1080's. So, unbalanced TS from JV to Hum Destroyer, then out of the Hum Destroyer via TRS balanced snake to the board, hum completely gone. The added benefit is that the Pyle size is more compact, and fits more easily in the back of the rack. I opened one unit and although the construction is less robust than the expensive unit, there are indeed two isolation transformers and a circuit board in an all metal box. They will just stay stationary in the rack so I'm not worried about how they stand up to road abuse. Great value for the money. Used for the correct application these will remove your hum.

I moved recently and changed my computer and keyboard setup. I was getting a persistant low level hum through my speakers. I tried switching the cords out to balanced ones, plugging everything in on the same outlet, but nothing worked. It wasn't bad, just annoying. I did some searching and came accross this unit. It wasn't very expensive and the reviews were mostly positive, so I decided to give it a try with pretty low expectations. When it arrived, I patched it in between my Steinberg UR44 and the speakers and low and behold the hum was gone. I have had it plugged in for about a month now and the hum is nowhere to be... heard. Highly recommend.

I have an acoustic-electric guitar that has a low level noise on louder volumes, so I tried this to see if it would quiet it down. No luck. The noise became much louder, even on lower volumes. Don't know why that would happen, but whatever this device is designed to do, it's not working for in my setup. Here's what I did. Plugged in the acoustic-electric in an Input using a TS cable. Used a TRS cable from the Output to my practice amp (I also tried it with my Focusrite audio interface). The low volume noise without the Hum Eliminator became loud with it. This box may reduce certain types of noise in other situations, but it made mine worse. Interestingly, I have a Fender Mustang Micro headphone amp that does not work at all with the piezo pickups in my acoustic-electric. However, it works great with the Pyle box in between the acoustic-electric and the Mustang Micro.

It worked!! Wow, I wasn't expecting that. I have a Roland Juno-D synthesizer running through a Berringer XENYX802 mixer and outputting to Berringer K900FX amps. It all worked fine until I connected the keyboard to a Thinkcentre desktop computer. I immediately got what I 'think' was a ground loop hum. I switched out several patch cables, thinking I was getting noise through the cables. I tried connecting the keyboard via a Edirol MIDI adapter. That adapter seemed to quiet the connection a little, but wasn't the setup I wanted. I then ran all the sound components through an APC battery backup, trying to isolate the A/C from in house interference. Next, I tried a higher-end grounded USB-C cable with ferrite cores at the connectors--no luck. I finally connected this PYLE PHE300 box in between the mixer and the amps--BINGO--the hum was gone. I don't know if any of the other stuff I did had much effect, but I've left everything in place. I now have clean sound with practically no noise or distortion.

Pros: it’s cheap, very cheap. Can use for experimentation. Cons: colors sound. Bleeds off tone. Useless for my application (in between rack effect and guitar amp). It DOES eliminate some ground loop hum, but also destroys my tone, making it useless. Plastic jacks. Sounds like it’s shorting itself if jacks wiggle at all (which they do, because they’re plastic). I should have known that for the price it would be a paperweight, but it was worth a try, I guess..

I bought this to deal with a horrible hum issue due to my GPU. Some programs and especially games were absolutely unbearable and had to be used with all of the audio turned off, and of course it made 90% of my audio production absolutely impossible. That setup involves all Presonus gear, including interface, sub, and monitors. That hum was easily handled by adding this hum eliminator, which is a steal at only $20 at the time of this writing. My final setup meant running the interface to the hum eliminator, then to the sub, then to the monitors. Your system may be different. With all of that said, I did have to replace the first one that was delivered. It arrived looking pristine in a nicely sealed package and inner covering. WHEN it worked, it was fantastic. Unfortunately, one of the jacks had a wiggle problem that resulted in bad connections and the lightest bump would disconnect the contacts, over and over again. Literally, walking on our bouncy old living room floor would disconnect it. At first, I thought it was the model and not the individual unit, and I replaced it with a supposedly better item. That item did absolutely nothing to solve the hum, so I returned it and I immediately reordered this product. The next one to arrive was obviously used. All of the tape was cut and the inner bag was definitely not the original. However, just to make sure, I hooked it up... And it has been working flawlessly since. I can absolutely recommend this product. Just be prepared that you may not get a perfect unit on your first attempt. No power required. Simply plug in your audio cables and go to work. It's really that easy. If you know what to do, you're hooked up and going in two minutes or less. You may or may not need a minute to figure out which cable goes where, but in the end, it was a life saver here. The unit is pretty small. Just enough to house the 4 jacks. Beware that some cables may not fit side by side, depending on size. I am able to use two heavy ended speaker cables and two thinner ones, but could not get all four large ones to fit. That's an upgrade I'd immediately pay for if they would do so. Also, the jacks themselves are mostly internal, somewhat flush to the outside of the unit, and would be much better if they had outer washers and nuts like most jacks do. The same jack on this unit also comes loose too easily, but nothing like the first one I tried. I have tried to show that in the photo. I may or may not try to upgrade that myself. Overall, I'm very happy and would buy this again or recommend it to anyone trying to solve a hum issue.

I use a USB interface to route sound to my studio monitors, and I was getting constant electrical hum and interference that seemed to be coming from my PC. It was to the point that the monitors were unusable if the GPU was under any sort of load, and I would get audible noise spikes any time I moved my mouse. Some googling quickly showed me that a) this is a fairly pervasive issue which usually requires replacing your motherboard, and b) it's way more common than you'd think, and there's almost never a solution in any forum other than "buy a new Mobo and hope." I tried tons of things to kill this noise, including a ferrite shielded USB cable, USB isolator, using a different interface with external power supply, using all those options with a powered USB hub, double routing the monitors, using XLR and RCA instead of 1/4", moving monitors to separate power stream. NOTHING worked. I had resigned myself to needing to purchase a new motherboard when I came across this type of item mentioned in a 5 year old thread. The moment I put this in line to my monitors ALL THE INTERFERENCE WAS COMPLETELY GONE. I cannot believe how long it took me to find this given how common this issue is, particular with NVIDIA GPU systems (notorious for causing ground loop interference from being poorly shielded). This product does EXACTLY what I needed it to. If you use monitors with your computer setup and you ever get noise that seems to be coming from your PC/Mac or the USB input - this is what you need. Stop looking, put this in your cart right now. Buy this and the smallest run of Hosa (or similar brand) 1/4" cables (you need an extra pair to use this) and your noise issue will be 100% gone. Seriously, I fought this issue for over 2 months and was at my absolute wits end, and this completely knocked it out.

Well I bought this and still have a buzz and a humm but not as bad as it was. I put my guitar into Input A and then looped OUT PUT A to INPUT B and then from OUTPUT B I go into my amp. I guess there is a small reduction in noise.. but I can not find a 120 V 1:1 Isolation Transformer at a reasonable price to add a male Connector on one loop and then a Female Connector to the other and then just screw nail the whole thing to a piece of wood and and a Tupperware bowl to the top of it like I did 30 years ago. So..its a wash.

I got this from the warehouse and it was a good deal. Works great for me if I place it after a buffer at the beginning of my signal chain. It cleans up the background noise amplified by the distortion and boost pedals. If you try it without a buffer at the beginning there is a loss in output or something but after there doesn't seem to be any noticeable sound quality loss. No noticeable effect at the end of my signal chain but results may be different.

It didnt work for me i have no idea if it would work for you but it didnt for me

Finally it fixed the buzz noise I had for a long time!

Its totally Fine

Resulta que el eliminador de ruido no se debe conectar entre el instrumento y la interfaz (en mi caso una mezcladora o un amplificador) porque genera mucho más ruido sin eliminar nada, sino entre la interfaz y las bocinas para que quite todo el ruido del sistema. En todos los videos y reseñas que he visto, si se usa un solo canal mono, se debe usar el canal 2 en lugar del canal 1, y el canal 1 solo se debe usar cuando el canal 2 ya está usado.