Performance Optimized Down Fire Wide Sealed Dual 12" Shallow Sub Enclosure Alpine RSW12 · Dual 12" Sealed enclosure

Because it trades length for depth and height. The standard Performance Optimized Down Fire platform is 30 wide by 15 deep; this one is 14 deep, 1 inch shallower, and 41 long. Spreading the airspace along 11 more inches lets the cabinet stand 7.75 inches tall instead of 9.4375.

Fourteen inches of depth is the practical minimum, since a 12 inch frame needs about 13 inches of baffle. If your space is long and low rather than deep or tall, this is the shape that fits.

Same driver, different shape. The standard cabinet is 30 by 15 by 9.4375 inches and holds 0.70 cubic feet net per chamber. This cabinet is 41 by 14 by 7.75 inches and holds 0.701 cubic feet net per chamber.

The airspace is effectively the same, so the driver behaves the same way in either. Choose the standard box when length is limited; choose this one when height or depth is the limit and you have 41 inches of run.

Each chamber holds 0.701 cubic feet net. The RS-W12D2 lands at Qtc 1.730, Fc 49.4 Hz and F3 33.8 Hz; the RS-W12D4 at Qtc 1.797, Fc 51.9 Hz and F3 35.4 Hz.

Qts on this driver is close to 1.0, and system Qtc can never fall below Qts, so no sealed box makes it flat. The rise near the corner is the character of the driver, and in a car it lands where cabin gain is already climbing.

One side-mounted Proline X terminal cup with a single pair of posts, pre-wired in 12 gauge OFC to both driver positions in parallel. You do not wire the two chambers separately at the amplifier.

Each RS-W12 is dual voice coil, in 2 ohm or 4 ohm versions, so the way you wire each driver's coils sets the load. Wire both drivers identically. Alpine's application guide ships with the drivers and diagrams every configuration.

Side mounted, and there is one cup serving both chambers rather than one per chamber. Every Proline X Performance Optimized enclosure uses a side mounted terminal cup, whether standard, wedge or down fire, which keeps the connection accessible with both baffles facing the floor. The cup is our Proline X ABS and carbon fiber composite unit, recessed, with stainless hardware, copper ring terminals and pre-wired 12 gauge OFC to both driver positions in parallel.

Down Fire cabinets are built with square corners as a series standard. The 3 inch top down corner radius used on other Proline X alignments does not apply here. A down fire box is a low, long platform that sits flat against a floor or cargo deck, and square corners maximize usable internal volume for a given footprint while keeping the cabinet stable on its mounting surface.

V-groove and dado joinery, CNC cut on ShopSabre routers from Langboard Elite MDF. Every panel joint is a machined interlocking groove that locks the panels before adhesive is applied, which keeps both chambers airtight under sustained pressure cycling. The front baffle is a 1.5 inch double layer, the outer layer machined as a flush recess around the 11.625 inch cutouts.

A full-height bonded 3/4 inch divider separates the chambers and ties the walls together across the 41 inch span, with perimeter cross-bracing and a light polyfill wall lining in each chamber. Do not add more fill; packing a sealed box makes it act larger and moves the alignment. Assembled and inspected in Tullahoma, Tennessee.

No. This listing is for the enclosure only. Bring your own pair of Alpine RS-W12D2 or RS-W12D4. The cutouts and mounting depth are direct fit for either version.