OK, just to confuse the issue, I now have two different measurements for the 'net' 'front to back' dimension (depth).
One of 14 3/4" (as stated by Zilch) and the other of 15 1/4"
(as worked out from Heather's specs)
If the overall depth is 20 1/4" and the front overhang is 3 1/2" and the back and baffle thickness total 1 1/2" (3/4" each) then therefore the inside measurement should be:
20 1/4" - 3 1/2" - 1 1/2" = 15 1/4", right?
Yet Zilch, you state that particular measurement is 14 3/4".
How is that extra 1/2" accounted for?