My bad. The ones in my main system are NOT shielded. (They're two of the 12" Rythmik Servo sub kits) However, when I used them behind my CRT, I didn't have any trouble withthe picture. I just got off the phone with Rythmik, and he said the stray field on the 12" driver is a lot more focused than the 15". So much for my plans for using the 15" in my HT set up. (sigh)
ANYWAY.....the Dayton sub is now sold.
Cheers