USA Diezel Rear-Loaded 4x12

If you own a USA Diezel Rear Loaded Cabinet and it has the insulation on the back panel - REMOVE IT. It kills the cabinet. I have owned mine for 3 years and never felt it sounded as good as it should. I also own 2 German FL cabs (one GK100 and one V30) they both kill. Today however after removing the back cover, I decided to remove the white insulation from the back panel (which my Bogner rear load v30 cab has also) and BAM! The cab has new life. A ridiculous difference in the sound of the cab now...like it had a presence adjustment for the better. From what I have read not all USA cabs had this white insulation so it may be hit or miss.

Curious what's the go on these RL V30 4x12's. B.A.D. makes them now. Anyone purchase one of these lately? Do they still have the batting?

Any info is appreciated.

Bump. I see a few of these used and curious about them vs. a Bogner 4x12 ST. Any recent experiences with these cabs?