Performance Optimized Down Fire Wide Sealed 10" Enclosure Diamond Audio DMD-SH · Single 10" Sealed enclosure

Because it is only 12 inches deep. The standard Performance Optimized Down Fire cabinet for the Diamond Audio DMD-SH is 30 wide by 15 deep, and this version is for spaces 3 inches shallower than that, under a rear bench or on a narrow cargo floor.

Airspace has to come from somewhere. Losing depth means recovering it along the length, so the cabinet runs 41 inches long and stands 5.9375 inches tall. If you have 15 inches of depth, the standard cabinet is shorter in length and is the better pick; if you have 12 inches of depth and 41 inches of run, this is the shape that works.

Same driver, different shape. The standard cabinet is 30 by 15 by 6.125 inches and was built to 0.80 cubic feet net. This cabinet is 41 by 12 by 5.9375 inches and holds 0.806 cubic feet net.

The airspace is essentially the same, within about a hundredth of a cubic foot, so the two behave the same way. The choice is about the space you have: the standard box is deeper and shorter in length, this one is long and shallow.

Because Diamond's enclosure table does not reconcile with the Thiele-Small parameters printed on the same page. Running their own published Qts and Vas through standard sealed box math gives Qtc values 0.2 to 0.3 higher than their table, for every variant.

That is not a gross versus net convention issue; no reasonable interpretation of the volume closes a gap that large. We publish figures computed directly from the driver parameters: in this cabinet the DMD102SH reads Qtc 0.854, Fc 62.1 Hz, F3 53.2 Hz and the DMD104SH reads Qtc 1.002, Fc 63.1 Hz, F3 49.6 Hz.

These two differ more than most dual-impedance pairs. The DMD102SH runs a Qts of 0.66 with 13.7 T of motor force and 7.9mm of Xmax, landing at Qtc 0.854, Fc 62.1 Hz, F3 53.2 Hz. The DMD104SH runs a Qts of 0.77 with 16.4 T and 8.8mm, landing at Qtc 1.002, Fc 63.1 Hz, F3 49.6 Hz.

The D4 has the stronger motor and more excursion; the D2 has noticeably better damping. Check what load your amplifier is stable into first. If either works, choose the D2 for accuracy and the D4 for output.

Because the driver's free-air resonance is 48 Hz, which is high. A sealed enclosure raises the system corner frequency above the driver's Fs, so no sealed box puts this driver into the 30s. In this cabinet the D2 is 3 dB down at 53.2 Hz and the D4 at 49.6 Hz.

The DMD-SH is designed for punch and midbass authority from a 3 inch mounting depth rather than deep extension. In a vehicle, cabin gain rising below 50 Hz fills in well below the anechoic figure.

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.

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. A windowed U-brace, dadoed to the shell, ties the long walls together across the 41 inch span. The front baffle is a double layer at 1.5 inches, two bonded 3/4 inch sheets with the outer layer machined as a flush recess. 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 Diamond Audio DMD102SH or DMD104SH. The cutout and mounting depth are direct fit for either version, and the feet ship uninstalled in the box.