I would see if you could borrow a newer amp from your ARC dealer. ARC solid state amps have come a long way since the early 90's and the D240 mkII. I think that would make the most significant change. I would also check to see if there is any deterioration around the speakers cones.
Those cables are very good and seem to only get better over time. I have tried others on occasion and have always come back to the ARC gray Litz II cables.
Those cables are very good and seem to only get better over time. I have tried others on occasion and have always come back to the ARC gray Litz II cables.