I’ve gone full circle, I used Ashdown for years then switched to markbass for a number of years now I’m back with Ashdown and 2x15 markbass cabs 😄, but I’m looking next for a barefaced dubster or a gen 3 supertwin .
I’ve got an LB30 and I had some interference once, it turned out it was a dodgy cab lead , but you said that you’ve tried that , maybe @Ashdown Engineering Can offer some advice 🙂