hm...
maybe your grounding cables want to be connected better?
try to plug them into the amp grounding and not the mixer grounding...

___________________
www.andrew-k.com

may be this will help

Take out both cartidges and wet the ends

or try unpluging one of the tables from the ground see if that makes a difference.

Peace

ESO

___________________
Great Music Stations: 2HP.ca Radio & etn.fm

is it possible you are overdriving the mixer, or overdriving the amp from the mixer?

-mer

Maybe your cartrdige headshell is actually sliding on the vinyl itself, causing physical distortion and making it sound all crackly and hissing...that's what happened when I first bought my Stantons, didn't know what the fuck the sound was...thought it was my speaker or record, but I looked at the cartrdige and found out that it was actually sliding on the vinyl!
If this is the case, adjust tonearm height, or replace styli so that the cartridge is lifted off, like it's supposed to be.
Good luck.

Ortofons seem to eliminate the problem, I think the tracks contained frequencies that my old carts couldn't handle well (atleast thats what I think). Possible I wasn't using the correct weight settings.
Thanks for the help