Hi all, This is my first post to the Polk forum. I recently came across an pair of SDA 2A's. They are in pretty rough condition but will make for a nice restoration project. I have read a considerable amount regarding them on this forum and others. I would
like to pair them with my Sansui AU-517 amp. I have read that you can't use the SDA function with amps that are not common ground or dual mono amps. The Sansui is dual mono, but when I check continuity between the neg. speaker terminals I get a reading. Has anyone else used a Sansui 517 or 717 to drive their SDA's? Thanks for the input.