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 do not get the results shown for this product. The input/output plugs are loose and if you bump the plug in the slightest... you get serious buzz. I can't say that this product work badly for others... just for me. I'm keeping it none the less... because I will figure out why it's plug inputs are loose and fix them myself. It's easier than returning it for an exchange. Made in China does not mean made well. My DOD Gunslinger is made in the USA... and it's works fine without this product... but plug it in and yikes... ground buzz galore.*Update* 6/25/2018... One plug in unit... very bad. I made a choke out of a guitar cable and used it as a patch cord in conjunction with an 8 foot ground rod and ground wire... separate from my electrical panels ground... and got rid of 99% of the hum and ground noise. All that's left is the typical amplifier hiss... which eventually I will get rid of that too.*Update* 8/10/2018 …. now it just buzzes all the time. Does not matter how good the cord is or how well grounded the amp is.Changing my rating to a one star. This product does not live up to it's name. I will never purchase anything with the name PYLE on it again. Total waste of money.This particular product does not do what it was made for. It was cheaply constructed. The plug inputs are less than snug. My 1/4" guitar chord fits in each one of the receptacles but loosely. No snug fit allows for bad ground and buzz and hum. It's junk pure and simple.

I added The PHE300 Pyle to my pedal board and it did nothing.I went through the connecting cords to my pedals and found that one of them was causing a lot of hum so I switched it out with a new one and it cut the hum down significantly but a slight hum was still there.Next I added The PHE300 Pyle, I put it right after my distortion pedal, and the hum was, like it says, DESTROYED.I did not have much faith in the The PHE300 Pyle because of the cheap price but Wow, my rig is so silent now, even when I crank my distortion pedal to the max.

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.