How properly covered internal sides of enclosures for speakers with a passive radiator?

Check my enclosures, shown here, 9th photo, back off, innards shown:

Polyfill, be careful of staples, get them straight, hammer them in if needed.

Prior enclosure, on 8" legs, woofer facing down, I had a buzz once, it was a loose staple on the woofers cone 

Now, shorter base, woofer facing front, slightly tilted back (to aim tweeters at seated ear height and time alignment if you believe in that).

No special bracing in that big box. I put lots of Donna's pricey beloved objects on the slightly slanted top, they don't vibrate or move. Very very slight sensation if holding hand on their side.

Cabinet has a rear port, used in prior room 'no wall behind' location. Port closed for this location with wall behind.

My AR2ax were stuffed with ancient fill, now totally filled with polyfill. Not ported, but rather than simply lining the walls like my other ones, stuffed.

JBL used 1’’acoustic fiberglass insulation in their speakers with passive radiators, (except the front baffle). See below: 😎

Mike

https://www.lansingheritage.org/html/jbl/plans/1960s-manual.htm

https://www.lansingheritage.org/html/jbl/catalogs/1979-home.htm

https://www.lansingheritage.org/html/jbl/plans/jbl-plans.htm

OP:  You should definitely try these kind of questions over at DIYaudio.  Lots of builders there with hands on experience.

Thank you very much for your time to help me. Happy New Year.