@spatialking , many belated thanks for this excellent guidance which I have actually applied in my solution, and shame on me and apologies for failing to acknowledge and thank you until now.
I ended up using four 5/16" fiberglass bolts, one bolt per line (L+, L-, R+, R-) anchored on a flat PVC bar, and at each bolt a nylon bushing at bottom and a fiberglass nut on top clamping a stack of four spades (amp output and 3 speaker feeds) for that line. Used 1 mm thick copper washers between the spades to ensure contact area.
I believe this approach minimizes inductance (as well as capacitance).The result sounds very good to my ears. Thanks again!!
I ended up using four 5/16" fiberglass bolts, one bolt per line (L+, L-, R+, R-) anchored on a flat PVC bar, and at each bolt a nylon bushing at bottom and a fiberglass nut on top clamping a stack of four spades (amp output and 3 speaker feeds) for that line. Used 1 mm thick copper washers between the spades to ensure contact area.
I believe this approach minimizes inductance (as well as capacitance).The result sounds very good to my ears. Thanks again!!