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Any way to alternately ground my Bass Pod Pro?

I

Infiltration12

Aug 31, 2009
189
2
Spokane, WA
#1
Hey guys, I've been having a problem with my original Bass Pod Pro where a loud buzzing is produced when I have it stacked in my rack case with my Sunn 1200s and I'm using both of them at once. Strangely enough, I can put my Pod off to the side of my rack case, away from the Sunn, I can use both and there is no buzz.

Anyway, I've been experimenting, and found that I don't have any buzzing problem at all when I have the internal ground wire of my Bass Pod detached from the chassis of the pod and simply looping back on itself. Is there a way I can alternatively ground this? Maybe connect the internal ground wire to something else? Thoughts in general on my situation?

Thanks guys.
 
#3
You probably need to isolate the POD and/or Sunn chassis ground(s) from the rack to eliminate a ground loop. There are little plastic shoulder washers made just for this purpose. Then the only common ground is through the cables as intended.
 
#4
Bofee said:
You probably need to isolate the POD and/or Sunn chassis ground(s) from the rack to eliminate a ground loop. There are little plastic shoulder washers made just for this purpose. Then the only common ground is through the cables as intended.
Click to expand...

Already have Humfrees on all of my gear. It still buzzes even if the bass pod is sitting on top of the rack, but not if it is off to the side. It's almost like the POD is causing some sort of interference with the 1200s.

And billfitzmaurice, I've read that many times. I haven't been able to fix it with anything from that yet.
 
#5
Since it hums atop the rack, it is picking up the magnetic field from the Sunn's power transformer.

The only solution is physical separation. Nothing else will do the trick, so the ground-loop instructions won't help here. If you have other gear in the rack, try mounting it between the Sunn and POD.

When it's humming, just lift it farther from the rack. The hum will fade with distance.
 
#6
Rick Auricchio said:
Since it hums atop the rack, it is picking up the magnetic field from the Sunn's power transformer.

The only solution is physical separation. Nothing else will do the trick, so the ground-loop instructions won't help here. If you have other gear in the rack, try mounting it between the Sunn and POD.

When it's humming, just lift it farther from the rack. The hum will fade with distance.
Click to expand...

Thank you! That seems to be the exact problem. Unfortunately, All I have to go between the two units is a Power conditoner, and it doesn't seem to do the trick. But.... I do have one open space in the rack... Time for a new toy?
 
#7
If the open space gives you enough distance to stop the magnetic hum pickup, you're set. Also, if the POD is not full-width, consider a universal rack shelf. There are plenty of mounting holes, so you may be able to get the POD mounted off-center.

But if you plop something else in there you might be back to square one! You can always install a blank panel.
 
#11
Just to clear things up, this is not a vintage Sunn. I own a Fender-made Sunn 1200s, manufactured in 1998.

Does anyone know if this is a problem with the Bass Pod specifically or the Sunn itself? For example, if I got a graphic EQ unit, would the EQ pick up interference from the Sunn just like the POD did?

Also, any recommendations for a rack-mountable multieffects processor? I only want basic effects, and would like to keep it cheap.
 

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