I am thinking in the next couple of months I will be putting together 4x 6cf or so boxes and using some Faital 18FH500 drivers, they are the same price for me as the PA460's as I am in Australia and I can get the Faitals really cheap.
Bassbox Pro says they are almost identical to the Dayton PA460 drivers, in fact, they have slightly better response above 30hz and pretty much identical below it. So they should be a good swap in for the VBSS subs if anybody can also get the Faitals easier.
I am not going to follow the VBSS build closely, I will be kind of winging my own design with a slotted port, but I guess the theory will be more or less the same.
Here is the Faital 18FH500 in Red, and the PA460 in White. ~6cf 15hz tune.
The Faital has a 17.5mm Xmech and 9.5mm Xmax, so I am thinking 350w per box will be just fine.
Now, just so I have this right. Are you guys with the VBSS subs basically flattening out the response at say 17hz for eg and throwing away all the extra sensitivity available, but basically taking advantage of the fact that the woofers will be barely heating up when pushed hard in the mid bass?
Obviously this does not look anything like a flat sub response. So, what is the EQ doing as per the VBSS iNuke settings? Is it boosting the low end, or cutting everything above tuning freq to attain a flat response?
Am I right, seeing as its about 105db at 17hz, that if I have four of them constructively combining I should be looking at 117db of output at 17hz/ 350w per woofer? If I flattened the reponse at 20hz, it would be 108db, so, +12 (for 4 boxes) would then be 120db at 350w per woofer before any room gain comes into play?
Am I on the right track here?