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

My Avantone Mixcubes were causing all of my monitors to hiss. I put this little gadget between my Mixcubes and the monitor controller and it killed 99% of the noise.Now I can only hear it if I stick my ear up to the cone. This is an effective and inexpensive solution.

Plugged in and drastically reduced my ground loop hum. Solidly constructed and compact form factor for a minimal design. There might be some noise generated from the class D amplifiers in my speakers, but that awful hum is gone! Just a soft powered whisper like the wind remains. This thing is plug and play and passive, cannot recommend enough for the price point. Great buy!

I bought the Teyun Q-12 audio interface to work between my desktop and Behringer Studio 50 powered speakers.When I connected everything, there was this horrible noise coming from the speakers even with the volume off. It sounded like driving with your car windows down I tried different types of grounding techniques and nothing work.So I give the Pyle Compact Mini Hum Eliminator Box a try. I wasn't expecting much since I had already tried a few other noise eliminators, but to my surprise it work like a charm. After I got everything connected up again, it took me a second to realize that the volume was still down because everything was so quiet. I absolutely love and recommend this product

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.

Goal: To play electric guitar through two 15 watt tubes amps with an ABY switch.Summary: It works! Nice and quiet, once I figured it out.Attempt1: Connect one guitar to the ABY switch, then onward to input channels 1 and 2 of the isolation transformers, and finally to two separate amps.Outcome 1: Muted volume and frequency response, topped with a heaping helping of AC noise. Unplayable at any gain setting.Attempt 2: Tried buffering through pedals between the guitar and ABY switch to feed both channels.Outcome 2: Even more AC noise, yikes!Attempt 3: Use only one channel of the isolation transformer, with the other channel connected directly from the ABY switch to the second amp.Outcome 3: Yes! Dead quiet, and the pedals add no noise when added to each channel, as long as there's no interconnection across channels. I can put pedals anywhere before the ABY or after, and it's all quiet.What's happening? The isolation transformer may be creating a serious ground loop when a common audio signal is connected to both channels. Under such conditions, my impression is that there may be two distinct ground loops formed on both the upstream and downstream sides of the transformers. Using only one channel fixes it. I haven't tried yet, but I suspect that using the other channel for an entirely different signal path, like a differnet guitar or mics running to a different amp or PA would work nicely. I will try to remember to update this once I try it.Bottom line: I opened this thing up to take a look, and it's well constructed, hand soldered, has wide pc board circuit tracings, and hot glue stabilizing the cable connectors. The little bitty transformers appear to be well-wound with permalloy cores and bobbins. There is no discernible change in tone using this rig, compared to plugging into the amps one at a time. Playing two amps together is awe-inspiring. This isolation transformer works well, if you are willing to experiment!