Mltl Design With Scanspeak

[kkchunghk]

Hi,

After the excellent explanation provided by Scottmoose on the TL work sheets here,

Some Thor models to mull over

there is really no excuse not to try out some designs. My starting point is the thor. I checked out the excel drivers here and thought otherwise ¡V the drivers are not cheap and the only shop that sells them is not particularly helpful. So I have my eyes on these two fellas from scanspeak:
S2905/970000
18S/8535-00
Turns out they are cheaper and, from the graphs at least, have flatter response than the excels. I also see Scottmoose¡¦s point about the folded pipe design of the thor and so I opt for a MTM arrangement in a MLTL box with the port at the bottom front.

[kkchunghk]

L=49¡¨ (1244mm)
So=Sl=3Sd
Where Sd=2x145cm2=290cm2
So the cross section is 870cm2 or about 290mmx290mm.
This is a bit big for my living room.
So what if I have only one 18S/8535-00 unit in the MLTL design:

[kkchunghk]

L=42¡¨(1067mm)
So=Sl=4Sd
Where Sd=145cm2 , 4Sd=580cm2
So the cross section is 189mmx307mm for a golden section.
The SPL is lower, but the roll off is similar.

Here is another attempt with 970000 and a different mid/bass driver:
15S/8531K01
The box design is a MTM.

[kkchunghk]

L=48¡¨(1219mm)
So=Sl=2.8Sd
Where Sd=2x95cm=190cm, 2.8Sd=532cm
That makes 181mmx294mm for a golden section.
Now the last two boxes are more or less the same size and the roll off is similar.
The problem is I have not got a chance to actually LISTEN to drivers. Am I to believe that the 5 1/4¡¨ driver can pump the bass as well as the 6 1/2¡¨. Anyway, the logical choice here seems to be the S2905/970000 + 1x18S/8535-00 if I can live with a SPL of 87dB. But I¡¦m told that the 15S is a smoother operator. So if I¡¦m to choose an all rounder then it is not so clear cut, money aside. Is there anything else I missed or should be considering? Glad to hear from the more experienced.
Cheers,
K K