I'm about to start on a DIY build for this 18" sub and I think that I've almost made up my mind as to what I want to do. This will be my first "real" build. I've done some car audio builds and a few haphazard bookshelf builds before, but nothing like this. I want this to turn out to be something I can be proud of that looks at-least decent. I want a box not a sonotube and I'm looking for a good compromise between HT and music performance. It will be used for 50/50 HT and music. The room that it will be placed in until I move is roughly 18x20x12 (4000cuft). The driver is rated at 1000wrms and xmax is 31mm. Here are the specs taken with a WFT3 with the dual 2ohm vc's in series...
RE 4.36
FS 19.51hz
VAS 8.571ft/242.7L
BL 22.73
Le 4.15mh
SPL 87.97
Mms 430.2g
Cms 0.15mm/N
n(0) 0.39%
Qms 4.302
Qes 0.445
Qts 0.403
I was originally going 4.5 - 6ft sealed because I don't have room for a huge 17cuft enclosure right now. Now I think that I'm going to split the difference and do roughly 13ft(370L), after bracing port displacement etc,tuned to 17hz with a slot port of 55" area and 36" length. When I model it in WinISD this looks pretty good to me. Plus this is about the biggest box I can go for right now and honestly I don't really think the sacrifice in the upper bass and larger cabinet required are really worth it for the little bit of content below 15hz. High output down to 15-16hz is fine for me. Basically it will be a similar but slightly bigger version of a Epik Conquest. Here is the proposed cabinet as of right now...
13ft assembled.jpg
Does this look good? Should I do 2 6" ports instead of the slot port? Should I be doing something different with this sub? Opinions please! I can provide more info if needed.