Performance Optimized Down Fire Wide Sealed 12" Shallow Sub Enclosure Arc Audio A12 · Single 12" Sealed enclosure

Because some installs run out of height or depth before they run out of length. The standard Arc Audio A12 Down Fire cabinet is 30 by 15 by 6.875 inches; this one is 41 by 14 by 5.8125. Spreading the airspace along 11 more inches lets the cabinet stand 1.0625 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 6.875 inches and holds 0.92 cubic feet net; this one is 41 by 14 by 5.8125 inches and holds 0.924 cubic feet net.

The airspace is matched, so the alignment is effectively the same. The choice is about the shape of your space: the standard box when length is limited, this one when height or depth is the limit and you have 41 inches of run.

No. The cabinet measures 0.992 cubic feet gross, on Arc Audio's own 1.0 gross optimum. The Qtc comes from the driver: the A12 has a free-air Qts of 0.612 on the D2 and 0.659 on the D4, and in this volume that puts the system at Qtc 1.211 and 1.338. That is an underdamped alignment with a lift near the corner frequency, which is the A12's intended character. Arc also publishes a 1.25 gross maximum, the more damped build in a taller cabinet; contact us if you want that instead.

The D2 is the better performer in this cabinet. It has the lower free-air resonance, 25.01 Hz against 26.995, and the lower Qts, 0.612 against 0.659, so it lands at Qtc 1.211 with F3 at 36.3 Hz, against Qtc 1.338 with F3 at 39.2 Hz on the D4. The D4 does carry higher motor force at 16.965 T against 13.948. Check what load your amplifier is stable into first, but if either works, take the A12D2.

Arc rates the A12 at 300 watts RMS continuous with 600 watts musical. Their documentation is direct that sustained operation beyond the RMS rating will burn the voice coil, and that damage is treated as abuse rather than a warranty claim. Underpowering carries no risk, but a small amplifier driven into clipping does. Feed it clean, unclipped power in the 250 to 300 watt range.

Side mounted. Every Proline X Performance Optimized enclosure uses a side mounted terminal cup regardless of alignment, whether standard, wedge, or down fire. On this cabinet that keeps the connection accessible with the enclosure in its installed position, since the baffle faces 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.

V-groove and dado joinery, CNC cut on ShopSabre routers from Langboard Elite MDF. Every panel joint is a machined interlocking groove that mechanically locks the panels before adhesive is applied, which keeps the cabinet airtight under sustained pressure cycling. Corners are square, the Down Fire series standard.

The front baffle is a double layer at 1.5 inches, two bonded 3/4 inch sheets, with the outer layer machined as a flush recess so the driver bolts to the inner layer. A windowed U-brace ties the long 41 inch panels together and polyfill is installed as a light wall lining. The double baffle carries real structural load with an 11.0 inch cutout in a cabinet 5.8125 inches tall. Assembled and inspected in Tullahoma, Tennessee.

No. This listing is for the enclosure only. Bring your own Arc Audio A12D2 or A12D4. The cutout and mounting depth are direct fit for either version.