Performance Optimized Down Fire Wide Sealed 10" Enclosure Hertz Mille Pro MP 250 · Single 10" Sealed enclosure

Because it is only 12 inches deep. The standard Performance Optimized Down Fire platform is 30 wide by 15 deep, and this application needs a cabinet that fits a space three inches shallower than that.

The airspace has to come from somewhere, so the cabinet runs 41 inches long instead of 30 and stands 7.0625 inches tall. If you have 15 inches of depth, the standard cabinet is the pick; if your space is long and shallow, under a rear bench or on a narrow cargo floor, this is the shape that fits.

The standard cabinet is 30 x 15 x 7.4375 inches and holds 1.05 cubic feet net. This cabinet is 41 x 12 x 7.0625 and holds 1.063 cubic feet net, 0.013 cubic feet more, because its height is set by the MP 250's mounting depth rather than by a volume target. More air means a lower, more damped Qtc, which is the safe direction. The choice is about shape: the standard box needs 15 inches of depth, this one needs 12 inches of depth and 41 inches of run.

The MP 250's 5.55 inch mounting depth sets the cabinet height, and the airspace follows from it. At 1.063 cubic feet net: MP 250 D2.3: Qtc 0.731, Fc 40.6 Hz, F3 39.3 Hz. MP 250 D4.3: Qtc 0.712, Fc 38.5 Hz, F3 38.2 Hz. The D2.3 and D4.3 are computed from their own parameter sets.

Those are anechoic figures. Firing into the floor, the sealed rolloff meets rising cabin gain, so in-car response runs deeper than the numbers above.

One side-mounted Proline X terminal cup, pre-wired in 12 gauge OFC. Final impedance is set at the driver and depends on the version: the D2.3 gives 1 ohm in parallel or 4 in series, the D4.3 gives 2 ohms in parallel or 8 in series.

Hertz rates the driver at 600 watts RMS. Confirm your amplifier is stable at your chosen load before powering the system.

Depth and excursion. The MPS 250 is the shallow-mount version and has its own shorter cabinet. The MP 250 mounts 5.55 inches deep, carries 17mm of linear excursion and 600 watts RMS. If vertical clearance is your constraint the MPS is the answer; if you have the height the MP is the more capable driver.

Side mounted. Every Proline X Performance Optimized enclosure uses a side mounted terminal cup, and on a down fire cabinet that keeps the connection accessible with the enclosure installed, 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, with no radii.

The front baffle is a double layer at 1.5 inches, with the outer layer machined as a flush recess so the driver bolts to the inner layer. A windowed U-brace ties the long panels together across the 41 inch span. Polyfill is installed as a light wall lining. Assembled and inspected in Tullahoma, Tennessee.

No. This listing is for the enclosure only. Bring your own Hertz Mille Pro MP 250 D2.3 or MP 250 D4.3. The cutout and mounting depth are cut specifically for this driver.