First I'd like to throw a huge thanks to people like
, among others, who made the whole Martysub lineup more popular and simplified the process for budding audio noobs like myself.
Onto business... My house is a mostly open floorplan with a very large ~3800 cu ft living area which is open to a ~1000 cu ft dining area, and then the dining area is open to a ~800 cu ft kitchen. To visualize, imagine a square, then draw a line from the center of the square to the middle of on the sides of the square. That is the only wall separating the areas. All of this is with a ceiling that rises from 8' to 10', with an average height of ~9.5' - in other words, it's a nuisance acoustically. Anyway, I bought a pair of Polk RTi10 towers in my undergrad years which worked great. I then got a CSiA6 center channel a couple years ago, and I rounded it out with 2 DefTech ProMonitor 800's mounted on the wall earlier this year. However, when I moved into this large open floorplan, I noticed that my bass was, well, non-existent. I previously had decent bass from my towers, especially since they are powered by a Acurus 200x3 amplifier, which has actually been measured at over 300W per channel into 8 ohms. But this room just swallows up all the bass. So my mission was to find a decent subwoofer to help on the low end.
I was originally in the market for a good 15" ID subwoofer and actually bought a PSA 15V before running into some health concerns which forced me to mail it back to Tom (great service by the way, highly recommend PSA). The 15V was great, even in my large space. But now that I have tortured myself reading these forums more and more, I decided to go with a DIY 18" sub when the money situation returned to normal. Unfortunately, I have zero tools or expertise with woodworking, having just finished graduate school. Luckily for me, my father is a master cabinetmaker, anything from built-ins to coffee tables to kitchens to bathroom vanities, and he (perhaps grudgingly) agreed to build the cabinet for me.
So in the end, the cabinet is modeled after the JTR Cap 1400 with some slight reconfiguration. I don't have tons of footprint for the sub, so I needed to go with a somewhat compact 18 like the Cap. It's going to be 22.5"W x 24"D x 28"H (plus any feet/spikes), made from 3/4" 13-ply baltic birch. The port is 1.5" tall - I know this is short but I don't listen very loud, rarely over -20 MV. Plus, if it's okay for the Cap 1400 it's okay for me
The port tuning should fall in the 17.5 Hz range after correcting the WinISD calculation in accordance with LTD02 suggestions for slot ports. Total net volume is 5.58 cubic feet, so fairly small for an 18" sub, but similar to the Cap 1400. The woofer itself is custom built coming from Paul Pierce based on the 2k line with 2000W RMS power handling and 100mm p-p xmech
I was torn between that and the HST-18 but then the HST price went up $100 and mae the decision for me. For cabinet construction the top, bottom, and side panels are all lock-mitered, while the front and back are rabbeted. There is one main picture-frame style brace in the center of the cabinet and 7 smaller wedge braces going front-to-back. The final cabinet will be covered on all sides with a quilted bubinga veneer which I am extremely excited to see finished. It won't be stained, just natural lacquer finish. The interior of the port will be painted black. Anyway, without further ado, let's go for some build pictures. These pictures are all dry-fitted, the cabinet is not fully glued up yet.
Main cabinet rear view
Here's the main brace, edges rounded over
Front view with the port channels rounded over and set back from the front edge
Interior view with main brace and wedge braces
And overall cabinet front view
You can sort of see the lock miter if you look close on the last image, but I'll post a couple more pictures of them close-up later. They were made on a shaper. I'm not here to pimp my dad's business, but he does awesome work, based around Baltimore, MD. PM me if you want a link to his website where he has a gallery of some of his actual work, not just my hobbies