@mylogic "Seriously can a few inches of jumper cable really make a difference?"
few inches of cable have resistance in 1….3 mOhms range, which is irrelevant.
bigger problem is speaker itself, which uses sometimes bad posts (gold / other plating over Ti or other high resistivity materials, oxidation etc. just to make it look “rich"). in that case, softer or harder jumper connector metals will make contact, which includes two contacting parts, to become the biggest variable. for perfectionists, like me, I would recommend to open speaker cabinet (low frequency driver taken off, crossover inductors resistance, resistors in mid/high driver circuit to lower output, terminal panel inside check etc.), to see bigger problem with tiny wires, tab terminals etc!