Performance Optimized Down Fire Wide Sealed 12" Enclosure Focal SUB 30 KXE · Single 12" Sealed enclosure

Because some installs run out of height or depth before they run out of length. The standard Focal SUB 30 KXE Down Fire cabinet is 30 by 15 by 8.99 inches; this one is 41 by 14 by 8.3125. Spreading the airspace along 11 more inches lets the cabinet stand 0.6775 inches lower, and at 14 inches deep it is 1 inch shallower front to back, about the minimum a 12 inch frame needs.

If you have 41 inches of run and height or depth is the limit, this is the shape. If length is the limit, the standard 30 x 15 is the better fit.

Same driver, same construction, different shape. The standard box is 30 by 15 by 8.99 inches and holds 1.30 cubic feet net; this one is 41 by 14 by 8.3125 inches and holds 1.539 cubic feet net.

The wide box holds more because the 6.77 inch motor sets its height, and on a longer footprint that height encloses more air. More air lowers Qtc, a softer, better damped corner. Choose the standard box when length is limited or you want the livelier alignment, this one when height or depth is the limit.

Focal rates the SUB 30 KXE at 800 watts RMS and 1600 watts maximum, so target 560 to 800 watts RMS at the final load.

The SUB 30 KXE carries two 4 ohm voice coils (3.2 ohms DC each): wire them in parallel for a nominal 2 ohm load or in series for 8 ohms. Confirm your amplifier's minimum stable impedance first.

The cabinet is 8.3125 inches tall measured in the down fire position, and that figure excludes the standoffs. The standoffs hold 1.75 inches under the baffle, so plan your space around a finished stack of roughly 10.0625 inches.

The footprint is 41 inches wide by 14 deep, the Down Fire Wide platform. Height is the only dimension solved to the driver.

The baffle is two bonded 3/4 inch sheets, 1.5 inches through. The KXE moves 1130 cubic centimeters of air at its 22.5 mm excursion limit. A single 3/4 inch panel flexes under that load, which smears output and works the driver loose over time; the second layer stiffens the face and gives the mounting hardware twice the material to bite.

The outer layer is machined as a flush recess to the 12.52 inch frame, so the driver bolts to the inner layer.

Anechoic, : F3 44.7 Hz with system resonance at 42.5 Hz (Qtc 0.674). Below Qtc 0.707 the rolloff is gentle and F3 sits above fc, which is what a well-damped sealed box does.

Those figures exclude cabin gain. In a car the cabin's transfer function adds real output below 50 Hz, so in-vehicle response runs deeper than the numbers above.

No. Polyfill is already installed as a light wall lining to control internal reflections, and the quantity is chosen so it does not change the acoustic volume.

Do not add more. Packing a sealed box with fill makes it behave as though it were larger, which walks the alignment away from the 1.539 cubic feet this cabinet was built to.

No driver. This is an enclosure only. You receive the cabinet finished in plush black carpet, one side-mounted pre-wired terminal cup, the polyfill lining already in place, the standoffs, and a threaded insert kit with stainless machine screws.

The inserts ship loose on purpose: Focal prints no bolt circle for the SUB 30 KXE, so you set the driver in the recess, mark its holes, drill and press the inserts. The Focal SUB 30 KXE is purchased separately.