{"product_id":"performance-optimized-down-fire-sealed-10-enclosure-hertz-mille-pro-mps-250","title":"Performance Optimized Down Fire Sealed 10\" Enclosure | Hertz Mille Pro MPS 250","description":"\u003cp\u003eThe \u003cstrong\u003ePerformance Optimized Down Fire Sealed 10\" Enclosure for the Hertz Mille Pro MPS 250\u003c\/strong\u003e is one of the shortest cabinets in the Proline X Down Fire line. At \u003cstrong\u003e4.9375 inches tall\u003c\/strong\u003e on a 30 by 15 inch footprint, it fits under seats where almost nothing else will go.\u003c\/p\u003e\u003cp\u003eThe Hertz MPS 250 is available as the \u003cstrong\u003eMPS 250 S2\u003c\/strong\u003e (2Ω) or \u003cstrong\u003eMPS 250 S4\u003c\/strong\u003e (4Ω), both rated 500 watts RMS and 1000 watts peak with a 3.25 inch mounting depth. The headline number is \u003cstrong\u003e16.8mm of Xmax\u003c\/strong\u003e, which is exceptional for a shallow 10. Polypropylene cone, 38mm voice coil, high density flux ferrite motor, and a mesh grille included in the box that can be rotated 90 degrees or removed entirely.\u003c\/p\u003e\u003cp\u003eThe 0.51 cubic foot net volume matches Hertz's own sealed recommendation of 14.2 liters. That produces \u003cstrong\u003eQtc 0.673 with F3 at 48.4 Hz on the S2\u003c\/strong\u003e, and \u003cstrong\u003eQtc 0.754 with F3 at 42.9 Hz on the S4\u003c\/strong\u003e.\u003c\/p\u003e\u003cp\u003eNote which coil is which here, because it is counterintuitive. On the MPS 250 the \u003cstrong\u003eS2 is the better damped driver\u003c\/strong\u003e, with a Qts of 0.41 against the S4's 0.48. That reverses on the 12 inch MPS 300, where the S4 is the tighter of the pair. Do not assume the pattern carries across sizes.\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 0.03 of their stated Qtc. That is not true of every manufacturer in this category, and it means the numbers on this page and the numbers in the Hertz manual agree.\u003c\/p\u003e\u003cp\u003eFiring down into the floor, the sealed rolloff meets rising cabin gain below 60 Hz, and in-car response extends well below the anechoic figure. 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 250 S2 or MPS 250 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":44540397977689,"sku":"PO 10-S DF MPS","price":229.99,"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_d3392418-bfcf-4041-8081-2882ffb8915f.jpg?v=1787113026","url":"https:\/\/audiointensity.com\/products\/performance-optimized-down-fire-sealed-10-enclosure-hertz-mille-pro-mps-250","provider":"Audio Intensity","version":"1.0","type":"link"}