CABLEMAX CableMax USB Isolator 5000 Vrms Dongle

I bought this to fix my hummm noise on my Samson Mic as people were suggesting it gets rid of that when using the USB connections. WRONG. The electrical humm noise is there. I wish I returned this garbage. It's probably empty inside since it weighs like a feather. DO NOT BUY THIS PRODUCT.

I have a home digital piano and a computer that hosts Digital Audio Workstation (DAW) software. The piano has a two prong plug (i.e., it has no ground). It has a USB connection to the computer for MIDI and PCM audio streams. And it has line outs that I wanted to connect to my studio monitor speakers. The computer also has line outs to those studio monitors. That makes two paths to the computer Earth (house power) ground from the piano (USB and speaker line outs) forming a classic ground loop. The result was noise in the speakers. Isolating the ground on the USB connection eliminated the noise completely. This device is "plug and play". It took all of about 1 minute to solve my problem.

Immediately solved an electrical noise issue on the USB. The product does not come with the 5V power supply not even a USB cable to use with a typical 5V USB wall charger. That said, I had moved my home recording studio and was experiencing significant noise to my Focusrite audio interface; both genral static and noise related to disk access, usb mouse movement, GPU processing, etc. this unit instantly solved that issue.

I bought this because my Sound Blaster X7 Limited USB Sound Processor for the last 9 years has made clicks & popping sounds, it also got worse if 24 bit, 48,000 kHz was selected. It always had to be at 16 bit, but still made unwanted noises. I picked up this isolator plus a 5V DC power adaptor https://www.amazon.ca/dp/B0BCFLW78Y?psc=1&ref=ppx_yo2ov_dt_b_product_details I have been using it for around 6 hours and ZERO unwanted noise and set to 24 bit. Very happy with this purchase, I wish I would have found this years ago.

I had a significant ground loop in an unbalanced line off of a USB sound card that was part of an otherwise balanced audio setup. It didn't matter what I did, I couldn't mitigate it. I was skeptical when I ordered this, but it worked perfectly right away! The line is completely silent even at full volume.