Do I really require this box volume?
I recently bought a pair of Vifa PL26W
when I tried using WinISD beta I got 3.75cuft of volume for the box ( ported ) But I rarely see any speakers using such a volume for the woofer in a 3 way system.. can anybody tell me why should I go with such higher volume? 
Large VAS? (over 100 liters at least, IIRC)

yeah it has
Vas 110 ltrs 
Re: Do I really require this box volume?
Quote:
1. Try taking the "optimal" enclosure volume that winISD/Unibox/whatever tells you, then halving it, or only 2/3 or 3/4 of it... plug that smaller cabinet into your program. 2. Tweak the box tuning until you get a satisfying roll off. 3. Now, compare the F3 of your "fractional" enclosure to the "optimal" enclosure. If the optimal enclosure has an F3 that's only a few Hz lower than your fractional one, then it's not worth it for those few extra Hz. Plus, with a smaller enclosure comes less group delay. Less space, tighter bass; it's winwin. Example: For the Sunflowers, I used the Dayton RS225, which says the optimal box is something like 75 Liters w/ an F3 @ 27 Hz. I built a 40 Liter cabinet (and adjusted the tuning to get a roll off I liked), and the F3 was 32 Hz. It just didn't seem sensible to me to build a box twice the size for 5 more Hz. Plus, as I said before, the transient response is tightened up over the larger cabinet (well, in simulation, anyway) 
You don't need to go as large; for example, in 60 liters you get f3 = 36Hz
http://img369.imageshack.us/img369/517/vifapl26wkg4.png http://img369.imageshack.us/img369/v...png/1/w800.png 
>>> If the optimal enclosure has an F3 that's only a few Hz lower than your fractional one, then it's not worth it for those few extra Hz.
I agree and do this all the time. But i have built cabs that were too small. So I usually see how big WinISD wants the cab and go as small as I want the cab and work my way up. 
thanks alot friends...

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