Ground noise when using 2 amps

[Firewalker]

I recently bought a fishman loudbox mini to use with my JP6's piezo output. I run the magnetic output to a mesa boogie dc-10. I use 2 mono guitar cables instead of the stereo cable.

I get a loud ground hum when using the distorted channel on the dc-10 amp (using the magnetics of course) For the clean channel the noise is there but a lot less noticeable.

What are the ways of around getting this hum noise?

 

[Lou]

Yes, get yourself a Direct box such as this:

Whirlwind IMP 2 Standard Direct Box | Musician's Friend

 

[beej]

You've got a ground loop, so you need to isolate the ground path from the two amps using something that's transformer isolated.

So a DI with a ground lift, buffer with a ground lift, etc. Quite a few gadgets that will do it.

 

[Firewalker]

Thanks for the info guys

 

[matty76]

I run mine through a radial JDI box, never had an issue, i just like to spend money

 

[auxren]

For less than a dollar, you can get one of these guys at almost any hardware store: http://www.prosoundweb.com/images/uploads/Fig7A1GroundLift.jpg

 

[beej]

For less than a dollar, you can get one of these guys at almost any hardware store: http://www.prosoundweb.com/images/uploads/Fig7A1GroundLift.jpg

Sure, and then you can spend the money you save on a defibrillator ...

 

[threeminutesboy]

Sure, and then you can spend the money you save on a defibrillator ...

you cracked me up with that one Jason!