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What title says: 1. Polk Audio SDA Non-Common Ground Amplifier Interface.Original owner put the umbilical cord (pin-blade) into the wall behind huge wall unit so it was impossible to get it without breaking the wall. So the cable is cut . About a foot on one side and couple feet on the other.$125 shipped anywhere in Con US OBO 2. Infinity Polycell High Output Tweeter 902-4270 Fits Sm-112 and other Infinity speakers. Tested and works great. $20 shipped UPS 3. Infinity 902-4315 5" Midrange Pair Fits SM-112 and maybe others Both work and look good. $40 shipped UPS Ground