On July 14, 2010, I started a thread
at the Seaton Sound forum about building a sub using MFW-15 drivers. At that time Danny or Erich hadn't yet obtained any drivers. I had purchased a Turbo kit for my MFW-15 cabinets and wanted a project for my left over MFW-15 drivers. Over two years later, I finally had some DIY dual opposed subs with the MFW-15 drivers.
In October 2011, I helped HuskerOmaha host a subwoofer GTG. In preparation for the GTG we had a lot of ideas and decided to build two LilMike F20's and four MFW-15 dual opposed subs. We also hoped to have a ported MFW-15, but I didn't find another driver for my cabinet. We want to compare alignments using the same driver. As the things progressed, we had more subs become involved in the GTG and our comparison never panned out. He ended up selling the F20's, I got rid of the Cherry Diamond MFW-15 cabinet, yet I still have the dual opposed MFW-15's.
I had a coworker build the cabinets since neither HuskerOmaha or I had the time or tools at the time to build them. He built all of them on a Saturday/Sunday morning and delivered them Sunday afternoon to HuskerOmaha's house.
The dual opposed subs are 22 1/2" wide x 22 1/2" tall x 24" long. I bought 3/4" 13 ply baltic birch for the outside of the cabinets ($75 a sheet) and 3/4" 13 ply hardwood birch ply ($32 a sheet) for the inside braces. It took 6 sheets total of plywood for all the subs. I entered all my piece sizes into Cutlist
and it generated my cutlist for each sheet of plywood. I have attached the cutlist below.
The cabinets were puttied, sanded, primed, and painted black. The black paint hasn't held up well and was easily scuffed. I am redoing the finished look of the cabinets. I just bought a router and am rounding the corners of the cabinets and painting with Duratex. I am also adding feet. I hope to get them finished tomorrow.
The cabinets are 5 cubic ft interior volume and I also stuffed them with Acousti-Stuf Polyfill
from Parts Express. The backside of the driver holes and the bracing holes are all rounded over. It cost $75 cabinet to get them built. The total cost for each sub including drivers, wood, screws, paint, stuffing, binding posts was about $385.