Audio Geek - SI HT 18" D4 subwoofers
I purchased four Stereo Integrity HT 18" D4 subwoofers several months ago (when at the time that it seemed that they were going out of production). Originally, I was going to just get two but I ended up buying four since I was afraid that I wouldn't be able to get another two in the future. Nevertheless, I've been busy with life (I've got two young kids), and I keep vacillating between different ideas on what to build. So, I'd appreciate any help with getting this project started and finished.
These will be going into my living room/dining room which is about 14' x 24' x 8'. The TV is situated along the short wall. Facing the TV, the front right leads to a hallway as well as the entryway. The back right opens into the kitchen. So, there's a lot of open space. I currently have a Hsu Research VTF-15H sitting in the front left corner.
My plans were to build two subs up front, and then two subs in the back to even out room modes.
I purchased a Behringer iNUKE NU3000DSP amp. This should be good for the first two subs. I'll build the first two subs and then go from there.
So, my questions:
Sealed or ported? I'm thinking that with the amount of space to fill, it seems that ported is necessary.
Two Ikea Lack side tables serve as speaker stands for my Fusion-12 Tempest speakers. I'm planning on replacing these two tables with the subwoofers. The rightmost side table juts into the hallway a tad right now so I can't go much wider than the current tables (21-5/8" wide). How narrow can I build a subwoofer cabinet for the 18" speakers? I see the diysoundgroup.com's 4 cu ft flat packs are 20" wide so I figure that should be doable.
The current height of the side tables is perfect to put the Tempest's waveguide at ear height. Sitting on top of the subwoofer, I'd flip the speakers over so that the woofer would be above the waveguide. It'll probably look really imposing, though.
Would a DBA (double bass array) work with just two speakers up front and two in the back?
Does it make sense to face the speakers toward the wall?
I was thinking along the lines of a Mini Marty Sub but it's too wide. How would a narrower sub (~21.5") affect the plans (I'm assuming the port will need to be longer)? I'll be aiming for a 17 Hz tuning.
I'll have more questions as I progress ...