Hi Xenon. This would be running a pair of Polk Audio SDA's and must be common ground. My Adcom GFA-585LE is common ground but not zero resistance common ground so requires the use of a jumper across the speaker out negative posts.

Thanks for the reply Helson. I am hoping someone who has one can check for me or maybe one of the Outlaws might chimb in.

Paging Ben to the Bat Phone.