fyi oregon area local pick up

sda2mike

not affil

http://www.ebay.com/itm/Polk-Audio-SDA-2-Signature-Reference-system-speakers-for-repair-/321009925866?pt=Vintage_Electronics_R2&hash=item4abdaebeea

zingo

Rough... Those would need to be completely rebuilt; drivers, hardware, and all. I would be cautious with any other hidden issues as all the hardware is rusted out.