Professional Series Ported 15" Enclosure Skar Audio VXF-15 · Single 15" Ported enclosure

Sealed, the VXF-15 needs 0.95 cubic feet net to reach a Qtc of 0.707. Vented, it trades that for deeper extension. The slot is gated at 1800 W, 1.2 times Skar's rating: the channel runs 21.0 m/s and the mouth 15.2, and the cone peaks at 11.6 of its 30 mm with the subsonic filter in place. Skar's own ported recommendation is 3.25 cubic feet at 32 Hz, before driver and port displacement. 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.

Every driver is run through the Performance Optimized wedge and down-fire before this chassis; the Professional box is where a driver lands when that smaller envelope, 30 inches wide and 18 inches deep with a triangular side port, cannot give it what it needs at its rated power. The VXF-15 did not clear the port gate there. The calmest wedge port that fits that envelope is 26.4 square inches at 24.0 by 11.12 by 17.86 inches, and its mouth runs 21.3 metres per second at 1500 W against the 17 metres per second line where a port starts to chuff. That port would stay clean to about 957 W. The slot on this box reaches 53.6 square inches and holds the mouth at 15.2 metres per second at 1800 W. An under-ported box does not fail quietly. Air speed at the mouth rises with power; past the chuff line the flow turns turbulent and the port is audible on every note. The turbulence also chokes the port, so the box behaves as if it were tuned higher than it is, loses output near tuning, and lets the cone travel further below tuning than the design allows. This chassis is a full-size front-firing box on a 2.25 inch baffle built from three 3/4 inch layers with the woofer flush-mounted in the outer layer, a Skar Audio logo acrylic, and a port and excursion budget checked at 1800 W. It carries a 2 year warranty, against 1 year on the Performance Optimized lines.

Skar Audio does not publish the mounting hole locations for the VXF-15, so we cannot install the threaded inserts before it ships. The threaded insert kit comes in the box instead: inserts sized to the woofer, the correct drill bit, 2.5 inch allen-head screws, an allen key and woofer gasket tape. You set the inserts when you mount the woofer, and this box ships with one kit.

Yes, at 26 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 Skar Audio VXF-15 at 39 percent of its usable travel at 1800 W.

Below about 24 Hz, yes. The maker's recommended sealed box is louder down there by up to 3.7 dB, because a sealed box rolls off gently into the subsonic region where a vented one falls away steeply once it is under tuning. Above that this alignment is the louder of the two for the same power. The Performance Graphs tab plots this cabinet, 2.75 cubic feet vented at 33.5 Hz, against Skar Audio's recommended sealed box, 2.75 cu ft, so you can see exactly where they cross.

It is a vertical slot beside the woofer, the full height of the cavity, 3.25 inches wide and 53.6 square inches. It runs 9.38 inches to the back wall and turns once along it for 19.10 inches; the fold costs about 1.5 Hz and the port is cut for it. The channel runs at 21.0 metres per second at 1800 W, 37 percent of its turbulence limit, and the mouth edges carry a 1/2 inch roundover so the air leaves the face at 15.2 metres per second against the 17 metres per second threshold where a slot starts to chuff.

71 lb, 36.00" W x 18.00" H x 16.38" D external. Every Professional cabinet is priced the same way, by its size: this one is 6.14 cubic feet outside. Delivery to the 48 states is inside the price; it ships as a 71 lb parcel and checkout adds nothing. Do not add polyfill; it ships dry on purpose.

No. This is an enclosure only, cut for the Skar Audio VXF-15 specifically: the 13.860 inch cutout, the 9.780 inch mounting depth allowance and the 2.75 cubic foot alignment all come from Skar Audio's published parameters. It fits both coil versions (D2 and D4), and the cabinet was checked against both. Bring your own driver.