Performance Optimized Down Fire Sealed 10" Enclosure | Hertz Mille Pro MPS 250 Single 10" Sealed enclosure

On this size the S2 is the better damped driver. It has a free-air Qts of 0.41 against the S4's 0.48, landing at Qtc 0.754 in this cabinet versus 0.754. The S4 does reach slightly lower, F3 42.9 Hz against 48.4, and carries more motor force at 17.3 T·m against 14.7.

Important: this pattern reverses on the 12 inch MPS 300, where the S4 is the tighter driver. Do not assume what you learn here applies to the other size. Both models are single voice coil, so the impedance is fixed by the model you buy - 2 ohms for the S2, 4 ohms for the S4. Check your amplifier first, then decide on character.

16.8mm one-way, which is exceptional for a shallow-mount 10. Most drivers in this category run between 8 and 13mm. Combined with a 500 watt RMS rating and a 3.25 inch mounting depth, the MPS 250 delivers a great deal of displacement capability from a very thin package. That is the core reason to choose this driver over a conventional shallow.

Yes, and that is worth stating because it is not universal. Running Hertz's own published Qts and Vas through standard sealed box math at their recommended volume produces a Qtc within 0.03 of the figure printed in their manual. Their enclosure data and their Thiele-Small data agree with each other.

Several other manufacturers in this category publish enclosure tables that do not reconcile with their own driver parameters, sometimes by 0.2 or more, which forces us to publish computed figures instead. Hertz did not have that problem, so the numbers on this page and the numbers in the Hertz manual are the same numbers.

The MPS 250 is a single voice coil driver, so there is no coil wiring decision to make. Your impedance is determined by which model you buy: 2 ohms for the S2, 4 ohms for the S4.

For reference, Hertz measures Thiele-Small parameters with coils in parallel on their dual coil models and notes that Fs, Vas and Qts are identical in series wiring, with only Re, Le and BL changing. That principle is why one enclosure design serves multiple wiring configurations across their range.

Side mounted. Every Proline X Performance Optimized enclosure uses a side mounted terminal cup regardless of alignment, whether standard, wedge, or down fire. On this cabinet that keeps the connection fully accessible with the enclosure in its installed position, 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.

Down Fire cabinets are built with square corners as a series standard. The 3 inch top down corner radius used on other Proline X alignments does not apply here. A down fire box is a low, wide platform that sits flat against a floor or under a seat, and square corners maximize usable internal volume for a given footprint while keeping the cabinet stable on its mounting surface.

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 is what keeps the cabinet airtight under sustained pressure cycling. The front baffle is a double layer at 1.5 inches, two bonded 3/4 inch sheets. On a cabinet under 5 inches tall the baffle carries a large share of the structural load, since there is minimal room for bracing geometry. Perimeter cross-bracing and pre-installed polyfill complete the build. Assembled and inspected in Tullahoma, Tennessee.

No. This listing is for the enclosure only. Bring your own Hertz Mille Pro MPS 250 S2 or MPS 250 S4. The cutout and mounting depth are direct fit for either version.