Performance Optimized Down Fire Sealed 12" Enclosure | Arc Audio A12

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td{background:#14532d;color:#fff;font-weight:600}.df-char{display:block;font-size:.78em;color:#a8a29e;font-weight:400;margin-top:2px}.df-opt .df-char{color:#86efac}.df-graph{background:#0c0a09;border:1px solid #44403c;border-radius:8px;padding:14px;margin:18px 0}.df-graph-title{font-size:.78em;font-weight:700;letter-spacing:1px;text-transform:uppercase;color:#a8a29e;margin:0 0 10px}.df-legend{display:flex;flex-wrap:wrap;gap:12px;margin-top:10px}.df-legend-item{display:flex;align-items:center;gap:6px;font-size:12px;color:#a8a29e}.df-sw{width:22px;height:3px;border-radius:2px;display:inline-block}.df-note{background:#292524;border:1px solid #44403c;border-radius:8px;padding:14px 16px;margin-top:10px}.df-note p{margin:0;color:#d6d3d1;font-size:13.5px;line-height:1.6}.df-link{color:#d99058;text-decoration:underline}.df-cta{background:linear-gradient(135deg,#0c0a09 0%,#5c3317 100%);padding:40px 36px;text-align:center;color:#fff}.df-cta h3{color:#fff;font-size:1.4em;margin:0 0 10px;border:none;padding:0}.df-cta p{opacity:.92;margin:0 auto;max-width:640px;color:#d6d3d1}.df-tier{overflow-x:auto;margin:18px 0;border:1px solid #44403c;border-radius:8px}.df-tier table{width:100%;border-collapse:collapse;min-width:660px}.df-tier th{background:#0c0a09;color:#a8a29e;font-size:.74em;text-transform:uppercase;letter-spacing:.6px;padding:12px 14px;text-align:left;border-bottom:1px solid #44403c;font-weight:700}.df-tier th.on{background:#3d2412;color:#e8b98d}.df-tier td{padding:11px 14px;border-bottom:1px solid #292524;color:#a8a29e;font-size:.88em;vertical-align:top;line-height:1.55}.df-tier td.a{color:#d6d3d1;font-weight:700;background:#1c1917;width:19%}.df-tier td.on{background:rgba(184,115,51,.10);color:#d6d3d1}.df-tier tr:last-child td{border-bottom:none}@media(max-width:600px){.df-hero h2{font-size:1.7em}.df-section,.df-enc,.df-cta,.df-hero{padding-left:20px;padding-right:20px}} Proline X Performance Optimized Down Fire 12" Sealed Cut and tuned for the Arc Audio A12 V-Groove and DadoLangboard Elite MDF0.92 cu ft Net25.010 Hz Fs 0.92cu ft net 1.208system Qtc, D2 36.3 HzF3 rolloff 6.875 incabinet height Performance, Performance Optimized, and Micro Proline X builds three tiers of Down Fire enclosure. The difference is not finish or materials, it is whether the cabinet was designed for a category or for a driver, and how much of the fitting work is already done for you. Performance Performance Optimized Micro Series Fitment Universal. Accepts any subwoofer that clears the published cutout and mounting depth. Woofer specific. Cut for one named subwoofer, with cutout, mounting depth, magnet clearance and displacement drawn in CAD from that driver. Woofer specific. Cut for one named subwoofer. Footprint Sized to the driver diameter. 24.5 by 13.5 inches on the 10 inch. Shared 30 by 15 inch platform on most builds, with cabinet height as the variable. A few drivers need a wider or deeper platform. Compact per driver footprint. 21.5 by 14.5 inches on the 10 inch. Front baffle Single, 3/4 inch. Double, 1.5 inch, outer layer machined as a flush recess. Double, 1.5 inch. Driver mounting Solid flange. You drill your own mounting holes. 8/32 threaded inserts, stainless machine screws included. 8/32 threaded inserts, stainless machine screws included. Joinery V-groove and dado, CNC cut. V-groove and dado, CNC cut, perimeter cross brace. Stack fab, dowel reinforced. Published alignment Modeled Qtc profiles across a range of drivers. No single response curve. A real predicted Qtc and F3 for that exact driver, calculated from its own Thiele-Small parameters. Target alignment described in the listing. Carpet Gray standard, black optional. Plush black. Plush black. Warranty 1 year limited. 1 year limited. 2 years. Feet ship with every tier, uninstalled on purpose. Mount them where your floor wants them for a down fire install, or leave them off and run the cabinet front firing or up firing. The orientation is yours to choose. This page is a Performance Optimized enclosure. The airspace, the cutout and the cabinet height all come from the Arc Audio A12's own published numbers. A Performance box fits your subwoofer. A Performance Optimized box was built for it. Built Around the Arc Audio A12 The baffle is bored to the A12's 10.91 inch cutout and the internal height is set by its 3.76 inch mounting depth and 4.32 inch overall depth. The finished cabinet stands 6.875 inches tall on a 30 by 15 inch footprint, measured in the down fire position, which puts a full 12 into spaces that normally cap out at a 10. One detail worth noticing: the A12 mounts shallower than the A10, 3.76 inches against 3.77. Practically identical, which means moving from the 10 to the 12 in this series costs nothing in mounting depth. It costs cutout diameter and 0.625 inches of cabinet height. The A12D2 carries a 25.010 Hz free-air resonance, the lowest of any driver in the Proline X Down Fire line, paired with a 76.32 liter Vas. The A12D4 sits at 26.995 Hz with 81.81 liters. Those are large-driver numbers from a shallow-mount platform. Xmax is 8mm one way, sensitivity is 87 dB at 1W/1m, and both variants are rated 300 watts RMS with 600 watts musical. Net Volume, Not Gross The machined cavity measures 0.994 cubic feet gross, matching Arc Audio's own optimum sealed recommendation of 1.0 gross. After driver displacement the working airspace is approximately 0.92 cubic feet net. Arc publishes their sealed recommendations as gross volume rather than net, which is unusual. Most manufacturers state net, meaning the airspace left after the driver's own displacement is removed. We built to Arc's gross figure as published, and both conventions appear in the specifications so you can compare against either one. True net, not marketing net. Internal volume is calculated from the machined cavity dimensions and the driver's published displacement, not estimated from external dimensions minus wall thickness. Alignment Character, Stated Plainly The A12 runs a higher Qts than the A10: 0.612 on the D2 and 0.659 on the D4, against 0.477 and 0.506. System Qtc can never fall below the driver's own Qts in any sealed enclosure, regardless of volume, so this driver produces an underdamped alignment with a lift near the corner frequency. That is the A12's character, and Arc's optimum recommendation places it there deliberately. In this volume the A12D2 lands at Qtc 1.208 with F3 at 36.3 Hz. The A12D4 lands at Qtc 1.336 with F3 at 39.2 Hz, so the D2 is both better damped and nearly 3 Hz lower. The D4 does carry higher motor force at 16.965 T against 13.948. If either load suits your amplifier, the D2 is the stronger choice here. Arc also publishes a maximum sealed volume of 1.25 gross. That is the more damped build, in a cabinet roughly 1.2 inches taller at 8.0625 inches. We ship the optimum because it is what Arc specifies and because it keeps the cabinet under 7 inches. The taller build is available on request if the clearance is there. Down Fire Construction Cut with V-groove and dado joinery on our ShopSabre routers from Langboard Elite 3/4 inch MDF, a dense 48.5 lb/ft³ board with a 200 psi internal bond and 410,000 psi MOE. Every panel joint is a machined interlocking groove that mechanically locks before adhesive is applied, which keeps the cabinet airtight under sustained pressure cycling. Corners are square on Down Fire cabinets. Double Baffle, Flush Recess The front baffle is 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. That recovers 3/4 inch of internal clearance. Side-Mounted Terminal Cup Proline X ABS and carbon fiber composite cup with stainless hardware and copper ring terminals, pre-wired in 12 gauge OFC. Side mounted so it stays accessible with the baffle facing the floor. Braced for a 10.91 Inch Cutout A 10.91 inch opening in a cabinet under 7 inches tall puts real structural load on the baffle. The double layer carries it, and a perimeter cross-brace ties the long 30 by 15 inch spans together. Polyfill is pre-installed. Down Fire and Cabin Gain The driver fires down into the floor and the cabinet couples to the surface it sits on. The sealed rolloff is gradual and meets rising cabin gain on the way down. Arc's own documentation notes that cabin gain adds roughly 12 dB per octave below 50 Hz, and with a 25 Hz Fs the D2 has real capability down there, so in-car response extends well below the anechoic figure. Power and Warranty Arc rates the A12 at 300 watts RMS continuous with 600 watts musical. Their documentation is blunt that sustained operation above the RMS rating burns voice coils and is not covered under warranty. Underpowering carries no risk, but a small amplifier driven into clipping does. Feed it clean, unclipped power in the 250 to 300 watt range and watch your gains. Both variants are dual voice coil, so final impedance is set at the driver. Drivers mount to 8/32 threaded inserts with stainless machine screws, included. The enclosure carries a 1 year limited warranty. Bring your own A12D2 or A12D4; the driver is purchased separately. Cut for the Driver, Not the Catalog One driver, one volume, one set of machine files. Cut, assembled and inspected one at a time in Tullahoma, Tennessee. Show more