I didn't mean to complain. Just stated what I saw.
Fs moved from 17hz to 25hz. I measured the one that worked before I had the work done.

No matter, I put them in 8 cubic foot ducted port boxes and tuned them to 22hz and they worked great as subwoofers.

In fact here is a photo.

18

I should put this setup back together, it was the best Altec sound I've had in my basement. My M19's are good, but this was better.

Ron