Here are four dual 2242 cabs that I built for our friend Scott Fitlin. They will be used to blast a bit of extra bottom end into his Coney Island bumper car ride. Since they will not need to be loaded into trucks every day going to different venues we pulled out all the stops and built the hell out of these boxes. These cabinets loaded with the woofers are well over 350lbs each! As many DIYers know MDF is an excellent speaker box material as it is self damping (non-resonant). The only thing wrong with it is that it is about as structural as a wet noodle. This becomes more of an issue as the box grows in size. Internal bracing helps, but to maximize the sonic impact at low frequencies we decided to build the box with a double walled construction. The interior layer is 3/4" MDF that is constrained by an exterior layer of 3/4" Finply. The 13 ply all birch Finply is extremely stiff. The combination of the two materials gives us a cabinet that while too heavy for many applications is nearly sonically ideal. Additionally the cabinets are braced with 1.5" X 3.5" Finply braces.
Another unique feature that we employed was to make the cabinets user tunable. Since they were being built on the West Coast for an East Coast venue, we decided to give Scott the option of tuning the bottom end for his room and taste. There are two ports per woofer chamber and we have supplied two port lengths. If two long ports are used the speakers will have maximum VLF power and low bass extension. If two short ports are used the bass becomes punchier but at the cost of VLF. It is also possible to use one long and one short for an intermediate tuning.
These subwoofers will be shipping out in the next day or two... I don't think the whales off the coast of New York will know what hit them.
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My 2245H enclosure
Originally Posted by Mr. Widget
