Reddi hums in live settings

It could be a ground loop with the pedal board power and the REDDI. This can happen if the grounds the the devices are plugged into are at different levels.

Into what are you plugging the amp, pedal board, and the REDDI. Any power strips involved? Try the REDDI and the pedal board power into the same power outlet.

 

No the ground lift is for the XLR only, not the 1/4". You could only lift the ground on a balanced 1/4" (TRS, not a TS).

 

Buy a Whirlwind Lifter. It's an outboard pin 1 lifter for the XLR out. Never fails to work for me.

 

Don't ask me how, but it does. I don't get hums very often, but now and then I do, and the Lifter fixes them every time.

 

Well now I don't want to get a REDDI. I'd hate to have to bring along one more thing "just in case". Especially after shelling out the money for a REDDI. Oh wait. I don't have a pedalboard, back to saving some money for a REDDI.

 

Plug the REDDI and the pedal board into the same outlet and try that. If it is a power ground loop between these units, it could resolve the hum issue.

 

Jimmy, you needing to carry another lifter is kinda strange, since the Reddi has a "ground lift" which is actually a Pin1 lift, which should perform the same function as your Whirlwind Lifter.

Not doubting your experiences or results at all, but the PA guy in me wants to investigate this further. And in your situation with PA and Backline Du Jour and the different situations you see regularly, it's not a bad idea at all to have that extra Lifter handy. There's no telling what is going on when you have to use the lifter.

The church just bought a Reddi (!!!I Know!!!) DI and it's 110 ways to awesome! We were all blown away with the sound quality of the basses with the Reddi, even over the Radial J48s and JDIs we were using. We haven't had any noise issues with this one, but we don't use amps, either, all IEM (yeah, THAT approach, but it seems to work well for us).

 

It's not something that happens every day, I can tell you that, and it only happens on some occasions where I'm using a tube amp. SS amps...no problem. No amp...no problem.

 

Back to that pedal board, are you sure you haven't got a noise feeding into the Reddi? No amount of lifting ground from the Reddi would cure that.

 

I think bypassing the pedalboard is the first thing you should do.

 

The FOH mixer ground is too far or different from the back line ground, causing the loop.

Creating one, common for the entire system eliminates the hum caused by different line to ground potentials at each piece of equipment.

 

Agreed.

Keep it simple and see what happens. If you find it is the board, introduce one pedal at a time until you find the problem. It could also be a bad patch cable on the board.

 

Or you can quit wasting your time and get the outboard pin 1 lifter

 

Been eyeballing that one in the classifieds. Wow good price too.

 

I will add to this, your amp should be on the same circuit as well.
Your XLR to the desk is not noisy so you don't need extra hardware to carry, the trouble is with the 1/4". The Reddi, pedal board supply and your amp need to be on the same circuit. I run into this all the time with our keys when he plugs into a different outlet, constant hum in the PA until I chastise him again for not paying attention.

An external ground lift will not work on a 1/4" unbalanced circuit.