IME, the denim?s specs implies it?s too absorbent for a MLTL. O-C 703 1? duct board same as what Altec sometimes used works well, while others prefer to stuff with loose polyfil. If you can split the denim in half it would probably be OK.
The M19 is ~ 8.35 ft^3 net. To get more bass extension requires more net Vb, so to get down to a low Fs with authority and/or to keep from having a ?boomy?/?flabby? bass with a high output impedance requires a huge cab due to the 416?s specs.
This is why I always recommend building the largest cab one can ?afford? if for no other reason than it allows some extra tuning flexibility.
A MLTL?s path-length is restricted not by it height per se, but by its height x its depth and any adjustment required to fit the driver in, but to fold it in half with a divider/vertical brace, it needs to be 23.25? o.d. deep for the 416A and dictates the dual 4? vents will normally exit the rear side corner[s] or back 13.1? i.d. up from the bottom.
If we split the difference and design based on a 39? ear height, a 34.25? o.d. MLTL height equates to a ~65.5? one fold path-length based on a ?? thick panel construction.
Combined with the M19?s 30? o.d. width, it will be near 11 ft^3 net.
All dimensions are approximate and sims are minimally damped.
1st sim = ~30 Hz tuning/0.75? long vents, 2nd sim = ~24 Hz [Fs]/4? long vents, so this is the typical tuning range.
GM
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