Quote Originally Posted by Altec Best View Post
As I said I get lost sometimes in the explanations so I apologize for that,I'm not even close to your level of expertise.

I took a couple extra measurements and cabinet can go as high as 65"- 70" with 70" being the absolute MAXIMUM height.
You're welcome! Ah well, divided by a common language. You don't need to be at mine or anybody else's knowledge level, just when asking for help, the more info the better, especially WRT any size/budget/SAF limitations and of course ask as many Qs as you need to keep from being confused as it can save more time than not.

Speaking of 'confusion', I just noticed that I didn't complete my now defunct first draft in that I didn't finish the cab gross Vb calculation, so I was wrong, the triangular MLTLs are only ~6 ft^3 gross, so too small for a 416 to go low without significant room gain.

This begs the Q of how well is your room/house constructed? If it's anything like my old WWII G.I. tract home there's not much gain at all and actually is a bass trap below ~16 Hz.

Regardless, any shorter than a ~96" total height then means the speakers must protrude into the room even more than the theoretical 8.5" o.d. high SQ limit to get back to the ~11.5 ft^3 that's theoretically required.

At 70", the MTM is marginal since this puts the 511 centered at 35" which is a bit low for an average seated ear height, so any lower and it's not viable for best SQ unless ya'll sit really low/laid back.

Anyway, the smallest practical horn cab is 11", so with only a 29.5" o.d. woofer cab height there's not going to be hardly any extra vent acoustic damping, so of course any shorter means none for all intent and purpose.

Again, in a MTM, offsetting the woofers, horn with the ST beside the horn and outside wall seems the best compromise. Putting the tweeter between the top woofer and horn will create an oddball lobing pattern/polar response that's shifted up slightly from the horn, though I've no clue how audible it may be, but my SWAG is that over time it will rub you the wrong way on music you're familiar with.

OK, regardless of whether you use an over/under or MTM, with a 70" total height, each woofer cab has ~8.5778 ft^3 gross with including the 8.5" extension to work with, so call it ~8 ft^3 net. Using published specs and tuned to Fs, this yields a ~50 Hz F3 in half space, so in theory it would be ~42 Hz in a corner, though there's enough efficiency to digitally EQ ~flat in-room to a lower F3 if desired if you have enough clean power on tap.

GM