I just got my d15 today... LOVE IT.

Only problem is I'm experiencing hum/buzz (sounds like 60hz ground loop). I have a professional recording studio in my house plus HT which are both on isolated clean power.

The buzz is loud enough that auddessey can't calculate correctly. All settings on the sub are the ones Brian posted a while back as "default". Its being fed by a Onkyo SR805.

Any suggestions?