I finished with my martycube build late last week. I came from a 15 year old KLH ASW12-200 that strained at the lowest levels in our large family room (9,000 cu. ft. completely open concept) and would chaff/clip/bottom out at the hint of deep/low bass. It's definitely an eye opening experience to go from my old sub to the 18" Marty. During the opening scene of Edge of Tomorrow I could feel the floors shaking and it makes me worry about my subfloor/joists, so I backed it off power wise a bit.
I was originally considering a Rythmik 12, was then suggested to get a 2x Rythmik 15's for my space. The $2600 price tag was scary when I was initially looking to spend $600 max. Once I was directed that my space was too large for that budget I set out for a better solution, in comes the DIY section of the forums. I want thank all those involved for their advice/inspiration/directions etc. as it made this a completely attainable solution over spending the $$$ for similarly specced (SP/DB) over the counter subwoofer assemblies.
My notes on the build:
- Buy a flatpack if you can find one, working with MDF is extremely messy and burdening, there are some great options out there, if I do this again, I will definitely go the route of purchasing one of them.
- When buying tools, purchase quality ones, one of my harbor freight clamps snapped (cheap enough to buy another one) and the HF braid nailer caused extra work from jams/missfires. New nailer already purchased.
- I used duratex with a smooth (sponge) 6" roller, the finish is what I expected and I like it. It's tough as nails and doesn't smell. The quart I purchased from parts express is 2.5x more than what you need for a martycube, buy less if you can. Maybe I can convince a friend to build one.
- Be careful if you use the speaker mounting kit from parts express and make some additions to the frame for mounting, the bolts weren't long enough and I made an unplanned trip to a department store after I got everything ready to mount (extra 45 mins).
- Buy a flatpack if you can find one, reiteration seems necessary.
Total cost of sub build came out to around $725. Completely and utterly worth it, my wife may not think so, but I've never experienced this much clean bass in a room as large as ours. Time to start going around the room and finding out what is rattling and make it stop.
Martycube - straight from the template laid out by Chaluga (No modifications)
Dayton Audio UM18-22
Crown XLS-1500 (Bridged)
Sub out (RCA) to Amp (XLR), Amp (Speakon) to Sub (Speakon)
0. Router jig I made. Making holes is much easier this way.
1. Interior bracing and T-nuts.
2. Recessed speakon mount.
3. Speaker test fit. (The speaker is ridiculously large)
4. Interior bracing and baffling. (walmart special).
5. Primed and painted.
6. Sealed Infinity 10" sub (old car sub), Crown Amp is sitting on the KLH 12" ported sub, Martycube (huge).
7. All done
For those interested, I moved the sub to another corner (out of site, definitely not out of mind, but tended to the WAF). I put the amplifier in our home theater cabinet and then ran 12ga speaker wire in the wall (25ft), through the crawl space, and back up to the sub. I also purchased a smartstrip to turn the amp on and off with the receiver. Nice and tidy build. Overall, it probably took 2 weeks, I gave the glue a lot of time to cure between steps, paint to dry, etc.