Thanks, ordered the bazooka today.
I have some sound-proofing insulation, I'll try to put the splash covers & pack the insulation behind. Not sure how to hold that insulation against the speakers, but will try to figure something out.
At the end of the day, I can do one of them & then flip the balance back & forth to see if it makes a difference. I remember as a kid though, a friend packed his speaker boxes in insulation & it DID sound much better.