The Goal: The client was interested in a predominantly SQ setup with a solid extension well into the lower 20Hz region given a single 12″ SSD series driver from Fi Car Audio in his 2000 Pontiac Grand Prix.
The Design: The driver’s parameters were relatively easy to work with and didn’t require anything overly elaborate in order to sustain a flat in-cabin response. After some modeling, I arrived at a fairly straight-forward rear firing bass-reflex design.
The Build: For starters, here’s a shot of the binding process. With the low temperatures this time of year, I feel more comfortable applying pressure in more places and letting the adhesives set for approximately an hour per joint. Notice the ratchet bar on the far side pushing the two parallel walls apart to form a perfect 90 deg. angle:
This enclosure is predicted to sustain relatively high vent velocity along the bottom octave so proper aerodynamics will be of moderate importance. The outer vent flare is beveled out to a 1.5″ radius while the bevel along the inner 90 deg. bend is beveled out to a 1″ radius:
The structural advantage of small radius bevels such as these is that the flare is solid throughout and has more glue joint surface than a typical notch-bent panel. The enclosure, itself, is another one of my screwless builds, though a set of drywall screws is being used as temporary clamps along the base:
Along the outside, the enclosure features a 0.5″ radius bevel which keeps the corners from snagging and protects the edges from chipping upon impact: