Pyle Compact Mini Hum Eliminator Box - 2 Channel Passive Ground Loop Isolator, Noise Filter,AC Buzz Destroyer, Hum Killer w/ 1/4" TRS Phone,XLR Input/Output, Uses 1:1 Isolation Transformer

Was actually quite surprised with how well this works. In our church, we have a few live feeds set up throughout our building, 3 to be exact. to have greater control we route our audio and video separately. We were getting a loud hum/static noise to the live feeds set up in the building. We could isolate it to the in house feed because our livestream feed for online had no problems whatsoever. Connected this and the noise went away immediately.No tricks to it for us. Connected our audio board to the XLR input then connected our switcher (which is what we were using to send audio to the live feeds in the building) via XLR out and problem solved!

I’ve been having ground loops with one of my tube amps for some reason, only when using a pedal. Amps are on a furman conditioner, pedals on cioks. I tried the ground loops fixing ac adaptors and also a second furman for the cioks but still had the problem. This fixed it, everything is dead silent now. High powered and ultra high gain with no issues all connected in a small bed room.

There can be many causes of hum / noise in a piece of equipment:* Bad equipment* RFI / EMI (radio frequency or electromagnetic interference)* Bad line power* Guitar-cord related ground loop (most common in guitar / microphone / amp situations)This item works dandy if you are experiencing a ground loop problem. There is a very easy way to test for this too: if you have a guitar amplifier that has unwanted hum / noise, simply unplug the guitar cord. If you're having a cord-related ground loop problem, the hum will vanish. Plug the cord back in, hum returns.That problem is exactly what this is for. Plug you guitar or microphone cord into the "in" jack, plug another into the "out" jack and to your amplifier, and this cleans it up well. An inexpensive and efficient solution.If your noise problem is caused by one of the other factors, that's not what this is designed to fix. You may need the more expensive Hum X or similar device to handle a socket-based ground loop or noise problem, or if it's a problem with electrical noise or RMI/EMI problems, you may need a pricey power conditioner.3-prong amplifiers: A way to test for socket-based ground loop issues is to use a prong adapter-- one of those orange or gray cheap things that converts a 3 prong plug into a 2 prong. This is for TESTING only as continued us can cause problems (there's a reason your amp has 3 prongs). Plug the amp into the adapter, plug the adapter into your electric socket, and if the hum vanishes a device like the Hum X will fix the problem. Avoid the temptation to just keep using the cheap prong adapter. It removes the grounding of the amp, and is a good way to burn out an amp or even cause a line fire. Of course if your amp only has 2 prongs in the first place, this doesn't apply at all.Bottom line: if the hum is caused by issues between the guitar and amplifier-- such is very easy to check by simply removing the guitar cord-- and this product will fix that. Note that if you have a serious issue with your guitar electronics or pickups, that may require repairing. But in my case this relatively inexpensive solution nearly zeroed my hum issues. Very pleased that it worked for me. If it doesn't work for you-- at least you'll have nice clean guitar line flow and you can look for other causes for hum.

I had a ground loop hum on a couple microphone preamps in my setup: one had a ground pin leading directly to the power-supply/transformer of the unit; and the other was caused by the power-supply to a tube microphone I was using. This effectively removed the hum in each situation without any change in signal quality or gain. I like that the unit is fairly well made and cheaper than similar products; it's also way cheaper than other products designed to eliminate ground loop hums at the power source, and in my situation potentially safer as those products are rated for 6Amp use on a single source. using a proper, more expensive power conditioner would be more feasible in that case.Out of curiosity, I tried using this on a preamp that has hum in the noise floor caused by issues in the unit's design when the gain is increased, and it did make the signal noisier, which was odd. It appeared the manner in which it isolates the signal to remove noise ended up unbalancing and amplifying the noise floor. I haven't tried other applications like reducing hum with a guitar and amplifier. I assume it wouldn't work well for that either. So four stars in that seems to falsely imply to be a silver bullet that solves all noise problems. The reality is that signal noise, hums, and buzzes can come from a slew of issues, and this unit is cheap enough and a good value to have around to either resolve some of those or help problem solve.