Professional Series Ported Dual 15" Enclosure Stereo Integrity SQL-15 · Dual 15" Ported enclosure

Both drivers share one chamber and one port rather than sitting in separate boxes, so the pair works against the whole volume and the port is sized for the pair rather than doubled. The port carries 70.1 square inches of area at 27.0 Hz, and the design power for the velocity and excursion checks is 2400 W for the pair. Passband ripple holds at 0.79 dB across the tuning, with F3 at 33.7 Hz. Tuning is chosen for in-car response rather than an anechoic curve: a vehicle adds roughly 12 dB per octave below about 45 Hz, and this tuning is where that sum comes out flattest across 25 to 60 Hz.

A single SQL-15 also builds in the Performance Optimized ported wedge, the smaller and cheaper single-driver box. A pair takes this Professional cabinet: one shared chamber on a 2.25 inch three-layer baffle with both woofers flush in the outer layer, and a slot port gated at 2400 W for the pair. It carries a 2 year warranty, against 1 year on the Performance Optimized lines.

Threaded inserts pressed into the baffle on the woofer's mounting hole locations, stainless machine screws included. The inserts are in the baffle when it arrives; the machine screws are in the terminal cup bag.

Yes, at 21 Hz, 24 dB per octave. Below tuning a vented box stops loading the cone and excursion runs away toward DC. With the filter in place this cabinet puts the Stereo Integrity SQL-15 at 50 percent of its usable travel at 2400 W.

The two alignments converge at the bottom of the band on this driver rather than crossing cleanly, so there is no meaningful subsonic advantage either way. Above 25 Hz the vent is the louder of the two for the same power. The Performance Graphs tab plots this cabinet, 4.20 cubic feet vented at 27.0 Hz, against the 2.00 cu ft sealed wedge we build for this driver (PO 15-S W SQL15) per driver, 4.00 cu ft for the pair, so you can judge it yourself.

It is a vertical slot beside the woofer, the full height of the cavity, 4.25 inches wide and 70.1 square inches. It runs 11.00 inches to the back wall and turns once along it for 27.96 inches; the fold costs about 1.5 Hz and the port is cut for it. The channel runs at 17.9 metres per second at 2400 W, 46 percent of its turbulence limit, and the mouth edges carry a 1/2 inch roundover so the air leaves the face at 13.7 metres per second against the 17 metres per second threshold where a slot starts to chuff.

94 lb packed, 46.00" W x 18.00" H x 19.00" D external. This cabinet is 9.10 cubic feet outside. Delivery to the 48 states is inside the price; it ships as a 94 lb parcel and checkout adds nothing. Do not add polyfill; it ships dry on purpose.

No. This is an enclosure only, cut for the Stereo Integrity SQL-15 specifically: the 14.170 inch cutout, the 7.400 inch mounting depth allowance and the 4.20 cubic foot alignment all come from Stereo Integrity's published parameters. It fits both coil versions; the alignment published here is the Dual 2 Ohm. Bring your own driver.