Performance Optimized Down Fire Sealed Dual 10" Enclosure | Prodigy NB3-10 Dual 10" Sealed enclosure

Because the NB3-10D4 has a low Qts of 0.407 and a small 14.43 litre Vas, and drivers with those numbers run overdamped in larger enclosures. Prodigy publishes a sealed range of 0.75 to 1.0 cubic feet, which lands the system near Qtc 0.526, well below the 0.707 maximally flat reference.

At 0.32 cubic feet net per chamber the system moves up to Qtc 0.657 and the predicted F3 improves from 68.1 Hz to 63.6 Hz. Smaller is genuinely better with this driver, and it lets a dual cabinet stand no taller than our single. Prodigy's larger figure reads like a target for prefab truck enclosures where cabin gain does more of the work.

Because two drivers in a shared sealed volume interact acoustically. Each driver's compression phase becomes the pressure environment the other driver is working against, which smears transient response and blurs the alignment each would have on its own. A full-height bonded 3/4 inch MDF divider eliminates that completely. Each NB3-10D4 gets its own 0.60 cubic feet net plus its own polyfill. Separate chambers are the standing design rule on every Proline X dual sealed enclosure.

Same footprint, same height, and better in every acoustic measure. Both cabinets are 30 by 15 inches and both stand 6.25 inches tall.

The single gives its driver 0.76 cubic feet net, landing at Qtc 0.526 with F3 at 68.1 Hz. Each chamber here gives 0.32 cubic feet, landing at Qtc 0.657 with F3 at 63.6 Hz. So the dual is better damped, four and a half hertz deeper, has double the cone area and double the power handling at 1200 watts RMS combined, in an enclosure of identical external size.

The tradeoff is the stiffer air spring in the smaller chambers, which raises system resonance to 58.7 Hz and leans more on cabin gain for the lowest material. If you only intend to run one driver, the single remains the right cabinet.

The enclosure uses one side-mounted Proline X terminal cup with a single pair of posts, pre-wired in 12 gauge OFC to both driver positions in parallel. You do not wire the two chambers separately at the amplifier.

Final impedance is set at the drivers. Each NB3-10D4 has dual 4-ohm voice coils, so you choose how to wire the two coils on each driver and that determines the load the amplifier sees through the cup. Wire both drivers identically, since mismatched wiring between chambers will split power unevenly. Confirm the resulting load against your amplifier's minimum stable impedance before powering the system.

Because the NB3-10D4 has a free-air resonance of 36.4 Hz, and a sealed enclosure always raises the system corner above the driver's own Fs. Shallow 12 inch drivers with resonances in the mid 20s or lower will always reach deeper anechoically. That is a driver property, not an enclosure one.

That comparison is fair on a bench and misleading in a vehicle. This cabinet fires down into the floor, so the sealed rolloff meets rising cabin gain below 60 Hz and in-car response extends well below the anechoic number. The NB3 was designed for truck cabs at 3 inches of mounting depth, and in that environment the low Qts produces bass that is tight and controlled rather than thin.

Side mounted, and there is one cup serving both chambers rather than one per chamber. 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 both baffles face 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 both chambers airtight under sustained pressure cycling. The chamber divider is a full-height bonded 3/4 inch panel.

Front baffles are double-layer at 1.5 inches at both driver positions, with the outer layer machined as a flush recess so each driver bolts to the inner layer. Perimeter cross-bracing and pre-installed polyfill in each chamber complete the build. Corners are square, which is the Down Fire series standard. Assembled and inspected in Tullahoma, Tennessee.

No. This listing is for the enclosure only. Bring your own pair of Prodigy NB3-10D4 subwoofers. The cutouts and mounting depth are direct fit at both driver positions.