Here's the deal: Ibanez RG2020 with DiMarzio Steve's Special in bridge position, Laney VH100R head + Marshall 1960BV 4x12 cab (V30s). At band rehearsals, I was experiencing uncontrollable feedback. My local shop guitar tech inspected the guitar and did a wax (paraffin) bath to the coils of my SS to prevent the coils to start resonating. Now I think the problem is quite gone, but if I play with the high gain setting of my amp while sitting on a chair that is 1 meter away from the stack, as soon as I stop playing, here comes the feedback (I am pointing my back at the stack, not my face). If I stand up in the same position, than no unwanted feedback.
I am trying to discover if this is normal or if it is due to the pickup. I must say that the SS is quite close to the strings (4mm from the open strings), I don't know if this can cause feedbacking.
NB: this appens ONLY with high-gain and SS selected. The same amp settings with the Air Norton don't produce feedback at all.