Radial Engineering SB-6

I use this for a stereo setup. I run my guitar signal through my pedalboard, and then split the signal out to two amps from an end-of-chain stereo reverb pedal (Neunaber Expanse). Now I run the stereo signal from the reverb into this, and then out to the two amps. Both amps have a ground connection. Not only does the SB-6 lifting ground to one of the amps eliminate a lot of hum, but the phase reversal button also turned out to be handy, cause it turned out that my two amps had been out of phase up untill now, and I just didn't know what I was missing. This increased clarity a lot. Mind you, this will only take care of ground-loop noise and out-of-phase problems, you still need a good-quality powersupply with isolated outputs going to each pedal to take care of the rest of the noise! But these things combined sure made a big improvement to noise-levels in my rig. Also, build quality seems solid and top-notch. It has soft padding on its underside, so if you plan to mount it on top of your pedalboard, you'll have to remove that and replace with velcro. I keep it underneath my Pedaltrain Novo 24SC board, where it just about fits, and I'm planning to secure it to the underside of the board with velcro if possible.

Sometimes you just need isolation without level attenuation - just easy interfacing between equipment that is suffering from ground loop issues due to being on separate ring mains. I've solved issues with humming monitors, FOH speakers and guitar amps with this. It now lives on my pedalboard, to help run balanced lines from a guitar rig to a rack processor and back, TS->TRS->TS, which reduces unbalanced line interference considerably. I also use it at numerous venues, where lighting desks, dimmer controls and even dishwashers are all spewing noise onto the mains. Some of this is cleared up by RF filters, but used in tandem with the Stagebug, you can eliminate just about anything (excl. single coil noise - nothing can save you from this, except humbuckers!). Another use was to put this between an active acoustic preamp and an A&H desk's Inst input, as I had run out of DI channels but still wanted isolation from the desk. Useful PAD and polarity etc. should you need it. Managed to fit this beneath my pedaltrain so it is out of the way. Very solid and well made, and well worth the money, even if you just keep it in your toolkit until it's needed.