So, I recently dropped in my two ported tens, and while they are decent both in output and SQ, I'm already looking forward. I've got about 3.75cu.ft. gross to work with, and I will be upgrading to a 3.5k, I'm thinkin a Crescendo BC3500D right now. So here are my 2 options:
1. Two DC Level 4 12's
Ported to around 31~33Hz
2. One DC Level 5 15"
Two 12" Passive Radiators, tuned to around 31Hz
The DC subs were just an example, I'm open to any brand, was just giving examples of caliber of sub. I think mounting inverted will be the way to go to maximize space, so sexy back ends are a must, and I do like neo.
I went with the PR's on the 15" in order to save space, and was also wondering if I would gain output with more cone area versus a port. In my mind, Vd is the same either way, so it shouldn't matter, right? And I know you're supposed to go larger with the PR, but Vd is actually what you are concerned about, and the little bit of extra surface area combined with the little bit of extra Xmax adds up to about double Vd of a Level 15.
I'm just looking to gather ideas now, won't be building for some time.