Amps in stereo

GuitarRock04 · Not So Newbie Joined: 29 Jan 2007 Posts: 5

I have a Boss DD-20 delay unit with left and right outputs for stereo use. I wish to use both my Jr and my SoCal half stack in unison, but when both are plugged in, it's noisy as hell. At first I thought it may be a ground problem, so I put a jumper between the grounds of the input and both output jacks. This was to no avail, so I would like to know whats up...

Am I missing something here, or will i just have to deal with this noise?

Guitar Dave · Newbie Alert Joined: 25 Feb 2007 Posts: 4

i ran into the same thing when I connected an A/B (which allows you to connect both amps as well) with my Hot Rod Dlx. and my DeVille 410. All I did was to put a 99 cent adapter (that doesn't have the ground wire) and it quieted it right up.
Dave

troy · Posted: Mon Sep 03, 2007 11:07 am Post subject:

Are you talking 60 cycle hum?

MikeM · Posted: Mon Sep 03, 2007 12:17 pm Post subject:

You are describing a classic "ground loop" problem. There are a couple of ways to get rid of this, first is the 99 cent "ground lift" or a more expensive ground isolator. I believe Ebtech makes one? Try the cheap route first and see if your noise goes away. If it does, you may want to invest in the ground isolator.