{"product_id":"performance-optimized-down-fire-sealed-12-enclosure-hertz-mille-pro-mps-300","title":"Performance Optimized Down Fire Sealed 12\" Enclosure | Hertz Mille Pro MPS 300","description":"\u003cp\u003eThe \u003cstrong\u003ePerformance Optimized Down Fire Sealed 12\" Enclosure for the Hertz Mille Pro MPS 300\u003c\/strong\u003e puts a full 12 into a cabinet \u003cstrong\u003e6.375 inches tall\u003c\/strong\u003e on a 30 by 15 inch footprint, built around a driver that mounts in 3.46 inches.\u003c\/p\u003e\u003cp\u003eThe Hertz MPS 300 is available as the \u003cstrong\u003eMPS 300 S2\u003c\/strong\u003e (2Ω) or \u003cstrong\u003eMPS 300 S4\u003c\/strong\u003e (4Ω), both rated 500 watts RMS and 1000 watts peak. Like the 10 inch model it carries \u003cstrong\u003e16.8mm of Xmax\u003c\/strong\u003e, an unusually high figure for a shallow driver. Polypropylene cone, 38mm voice coil, high density flux ferrite motor, mesh grille included that can be rotated 90 degrees or removed.\u003c\/p\u003e\u003cp\u003eThe 0.80 cubic foot net volume matches Hertz's own sealed recommendation of 22.7 liters, producing \u003cstrong\u003eQtc 1.003 with F3 at 37.1 Hz on the S2\u003c\/strong\u003e, and \u003cstrong\u003eQtc 0.812 with F3 at 39.5 Hz on the S4\u003c\/strong\u003e.\u003c\/p\u003e\u003cp\u003ePay attention to the coil choice, because \u003cstrong\u003eit reverses from the 10 inch model\u003c\/strong\u003e. On the MPS 300 the S4 is the better damped driver with a Qts of 0.42 against the S2's 0.51. On the MPS 250 it is the opposite, with the S2 tighter. If you have read the specifications on our 10 inch MPS enclosure, do not carry the assumption across.\u003c\/p\u003e\u003cp\u003eThe practical read: the S4 gives the more controlled alignment at Qtc 0.812, the S2 reaches about 2.4 Hz lower at Qtc 1.003 with a modest lift at the corner. Both are usable. The S2's \u003cstrong\u003e37.1 Hz F3 is among the deepest in the Proline X Down Fire line\u003c\/strong\u003e, and it comes from a 24 Hz free-air resonance paired with a 64.9 liter Vas.\u003c\/p\u003e\u003cp\u003eHertz publishes Thiele-Small measured with the coils in parallel and states that Fs, Vas and Qts are identical in series wiring, with only Re, Le and BL changing. One cabinet is correct for either configuration.\u003c\/p\u003e\u003cp\u003eWorth saying plainly: \u003cstrong\u003eHertz's published enclosure data reconciles with their own T\/S parameters.\u003c\/strong\u003e Running their Qts and Vas through standard sealed box math at their recommended volume lands within 0.2 Hz of their stated Fc on both variants. That is not true of every manufacturer in this category.\u003c\/p\u003e\u003cp\u003eFiring down into the floor, the sealed rolloff meets rising cabin gain below 60 Hz. Hertz suggests a 15 Hz subsonic filter at 24 dB per octave and a 70 to 80 Hz low pass for sealed applications.\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 MPS 300 S2 or MPS 300 S4. Both are single voice coil, so your final impedance is set by which model you buy.\u003c\/p\u003e\u003cp\u003eManufactured in Tullahoma, Tennessee. 1-year enclosure warranty.\u003c\/p\u003e","brand":"Proline X","offers":[{"title":"Default Title","offer_id":44540398043225,"sku":"PO 12-S DF MPS","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_c9c57507-5385-43a5-ba1b-3c721041263f.jpg?v=1787113026","url":"https:\/\/audiointensity.com\/products\/performance-optimized-down-fire-sealed-12-enclosure-hertz-mille-pro-mps-300","provider":"Audio Intensity","version":"1.0","type":"link"}