Originally Posted by SXRDISBEST
I would get the Ultimax 12" since its only $20 more. Then build a box that is 16"w X 20"h X 20"d (using MDF). That gives you 3cf, which is just slightly bigger than the PB-1000. Build it with a slot port that's 2 inches high by 33" long (panels would be 18" for the top of the port, and 12.25" for the back of the port (think miniature version of a marty sub) and power with the $150 Inuke 1000 or $200 DSP version. This will put out about 100-105db at 20hz and over 110 at 30hz. You would be gaining about 5db between 20-35hz compared to the sealed Ultimax 15".
All in you should be spending about $450-500 depending on whether or not you have the tools for cutting your own box.
I'm a little confused by the specs on that slot port. What is the width 14.5? That would put the tuning point at 26.3 hz in a 3 ft3 box. If the port was 1" high you would get a 19 hz tune. Also that 1" port inside the box dimensions given would leave you with 2.4 ft3, so basically a bit over 2 ft3 after driver/bracing are accounted for. That then leaves a tuning point of 22.6 hz (the 2" high port would have ended up 33 hz tune).
Just trying to clarify for the OP, if I'm missing something here let me know.
Originally Posted by 04rex
Ok, so looks like the 12" ported might work. The widest I can go is 18", the tallest is 20, and the deepest is 16. So the dimensions are good. MAYBE I can push it to the 18x20x20 diameter.
So those 2 (HO and Ultimax 12) can fit. Now begs the question. Would the HO with the spec'd box above be better or would the Ultimax with the spec'd box above be better?
Thanks for all your help guys!!
HO is green, UM is pink (assuming a 22.6hz tune). Both have 18hz/80hz filters and 500 watts.
The hump shape for the UM response is because it is a high Qts woofer being placed in an undersized ported box. The response would be pretty flat in a 5 ft3 20 hz box.
Slot ports are great but they effectively increase the box size by the port height + wood thickness in as many dimensions as they extend into, which is why the bigger slot ported sub ends up with a similar internal volume to the smaller round ported sub..