{"product_id":"performance-optimized-down-fire-sealed-12-enclosure-arc-audio-a12","title":"Performance Optimized Down Fire Sealed 12\" Enclosure | Arc Audio A12","description":"\u003cp\u003eThe \u003cstrong\u003ePerformance Optimized Down Fire Sealed 12\" Enclosure for the Arc Audio A12\u003c\/strong\u003e is a low-profile sealed cabinet built around Arc Audio's A-Series 12\" subwoofer. At 6.875 inches tall on a 30 by 15 inch footprint, it puts a full 12 into spaces that normally cap out at a 10.\u003c\/p\u003e\u003cp\u003eThe Arc Audio A12 is available as the \u003cstrong\u003eA12D2\u003c\/strong\u003e (dual 2Ω) or \u003cstrong\u003eA12D4\u003c\/strong\u003e (dual 4Ω), both rated 300 watts RMS and 600 watts musical with 8mm of one-way Xmax in a 3.76 inch mounting depth. Cutout is 10.91 inches and total depth is 4.32 inches. Note that the A12 mounts \u003cstrong\u003eshallower than the A10\u003c\/strong\u003e at 3.76 inches against 3.77.\u003c\/p\u003e\u003cp\u003eThe A12D2 carries a \u003cstrong\u003e25.010 Hz free-air resonance\u003c\/strong\u003e, the lowest of any driver in the Proline X Down Fire line, paired with a 76.32 liter Vas. The D4 sits at 26.995 Hz with 81.81 liters. Those are large-driver numbers from a shallow-mount platform.\u003c\/p\u003e\u003cp\u003eThe 0.994 cubic foot gross volume matches Arc Audio's own optimum sealed recommendation of 1.0 gross. Net after driver displacement is approximately 0.92 cubic feet, producing \u003cstrong\u003eQtc 1.208 with F3 at 36.3 Hz on the D2\u003c\/strong\u003e, and \u003cstrong\u003eQtc 1.336 with F3 at 39.2 Hz on the D4\u003c\/strong\u003e.\u003c\/p\u003e\u003cp\u003eBeing straight about those Qtc figures: the A12 has a higher Qts than the A10, 0.612 on the D2 and 0.659 on the D4 against the A10's 0.477 and 0.506. In a sealed box that 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. Arc also publishes a \u003cstrong\u003emaximum sealed volume of 1.25 gross\u003c\/strong\u003e, which would drop the D2 to roughly Qtc 1.11 with F3 near 34 Hz in a cabinet about 1.2 inches taller. If you want the more damped alignment and have the vertical clearance, that build is available on request.\u003c\/p\u003e\u003cp\u003eAlso worth noting: Arc publishes their sealed recommendations as \u003cstrong\u003egross\u003c\/strong\u003e volume rather than net, which is unusual. We have built to their gross figure as published.\u003c\/p\u003e\u003cp\u003eFiring down into the floor, the sealed rolloff meets rising cabin gain below 60 Hz. Arc's own documentation notes cabin gain adds roughly 12 dB per octave below 50 Hz, and with a 25 Hz Fs the D2 has real capability down there.\u003c\/p\u003e\u003cp\u003eConstruction is the full Proline X Performance Optimized platform: ShopSabre CNC-cut Langboard Elite MDF with \u003cstrong\u003eV-groove and dado joinery\u003c\/strong\u003e, perimeter cross-bracing, and a \u003cstrong\u003edouble-layer 1.5 inch front baffle\u003c\/strong\u003e (two 3\/4 inch sheets bonded) for maximum baffle rigidity and driver isolation. Corners are square on Down Fire cabinets. The driver fires down into the floor with the terminal cup \u003cstrong\u003eside mounted\u003c\/strong\u003e, keeping the connection accessible with the cabinet in place. Terminal cup is our Proline X ABS\/carbon fiber composite pre-wired with 12 gauge OFC.\u003c\/p\u003e\u003cp\u003eBring your own A12D2 or A12D4. Both are dual voice coil, so you set your final impedance at the driver.\u003c\/p\u003e\u003cp\u003eManufactured in Tullahoma, Tennessee. 1-year enclosure warranty.\u003c\/p\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":44540250947673,"sku":"PO 12-S DF A12","price":249.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0689\/1389\/files\/proline-x-micro-series-dual-15-sealed-enclosure-built-for-resonix-gus-15subwoofer-enclosuresproline-x-9360178_171ce9d9-4ea1-48ca-842c-1c9d566617da.jpg?v=1787106945","url":"https:\/\/audiointensity.com\/products\/performance-optimized-down-fire-sealed-12-enclosure-arc-audio-a12","provider":"Audio Intensity","version":"1.0","type":"link"}