The Goal: The client was interested in an SQL enclosure with some pressure-building potential for his 1998 Toyota Avalon using a pair of Eclipse SW6210 12″ woofers.

The Design: Working within a relatively compact space given given the cone area, I decided on a somewhat constricting bass-reflex alignment, still making use of the trunk cavity as a resonant chamber for an in-cabin response of 33Hz – 78Hz with excellent efficiency throughout.

The Build: With a cross-sectional area of 62.5in^2 along the compound section, an aerodynamic air path was in order. In this design, all four corners of the compound vent section are beveled to a 1″ radius quarter turn:

This particular project is another one of my horizontally screwless builds; a big bonus anytime I implement deep round-overs to compensate the vent’s peak velocity potential:

Then we add the corner slants and the compound section waveguide:

And, as a finishing touch, half inch round-over along the length of the enclosure so that it slides in and out of the trunk easier: