MLI1 Mono Passive Isolation Box

After buying a power conditioning strip, trying to plug everything into one ground, unplugging different things in my room to see what might be causing the buzz, these little boxes have improved my amp buzzing situation more than anything else. I am running two fender blues deluxe reissues and then also an acoustic A40 amp and i was getting terrible ground loop through my instrument cables. I bought three of these and ran my instrument cables out of my looper with these closer to the looper than the amp with excellent results. Now they are part of my pedalboard. The passive technology uses a transformer to cut out the ground connections through the instrument cables while allowing the tube amps to be safely grounded to the AC power. It took awhile for me to figure this all out so i thought maybe i could save some musicians the trouble. These work well and they are not that expensive.

I got this to help with ground loop noise from my amp's DI connection to my DAW. It works really well, it's compact enough to put in a gig bag and it's budget friendly.

Using it between the mixer output and the computer audio input for live streaming at our church. Completely eliminated all hum, static and crackling. We tried many other fixes before this and none worked. This isolation DI has solid transformers for isolation between the primary and secondary windings without altering the audio quality. A quality product. Does what it's supposed to perfectly. Love it.

Excellent value for a line isolator that converts unbalanced line audio to balanced. This cost less than a fourth of the Walrus Audio Canvas mono unit, so if you’re looking for a line isolator and don’t need a switch to convert to a conventional direct box, this unit is a good choice for pairing with an amp modeler for direct connection to a mixer.

I have a LOT of noise in my signal. With stereo guitar tube amps, lots of pedals, rack EQ in the FX loops, several signal splits, and a PC on for recording.Most of the noise is EM/RF pollution, and this box does nothing for that. Ferrite beads on most of the cables did nothing for that. My active pickups are super quiet on high gain at the guitar store, but at home are very very noisy. This box does nothing for that and will severely darken your tone if you put it right after the guitar output.But there are several layers of mild ground loops, from having the signal split to 2 amps, both FX loop sends combined in an ABY pedal to switch which preamp is fed thru the stereo FX chain and back to both power amps. A 3-way split for a direct dry signal for reamping, one to the key input of a phaser in the FX loop, and one thru the main signal chain. The worst noise is from the connection to the USB interface: it gets into the amps and everything. The ground lift on this totally removes that. And another on the phaser signal line, and one just before one of the amp inputs. They all reduce one layer of the hum. It actually gets worse if you put one on both amp inputs with the ground lifted on both: one of them needs a ground.And one between the amp XLR DI and interface, which is really necessary and works. Anything connected to the computer and guitar chain adds that nasty computer noise and the ground lift totally cuts it out.My reamp box has a ground lift that is absolutely necessary. That connection adds the most noise.The problem is, I probably need at least 6 more, and I've already spent $120 on 3 of these and $80 on one of those Hum Exterminator plugs that removed a high-pitched whine from a tube amp with built-in digital cab sim tech, but didn't remove the mild amp hum.So, yeah, they work for ground loops, but really? $40?! That's too much, especially when you're always gonna need a bunch of them.

Great isolator for when you need to isolate equipment. I find it good for isolating audio equipment form radio equipment in my ham radio station.