Performance Optimized Down Fire Wide Sealed Dual 10" Shallow Sub Enclosure Prodigy NB3-10 · Dual 10" Sealed enclosure

Because it is only 12 inches deep. The standard Performance Optimized Down Fire platform is 30 wide by 15 deep, and under a rear seat or on a narrow cargo floor there is often not 15 inches to give.

The airspace lost from the depth is recovered from the length, so the cabinet runs 41 inches instead of 30 and stands 5.9375 inches tall, with each driver in its own separate chamber. If you do have 15 inches of depth, the standard 30 by 15 cabinet is the better pick.

The standard cabinet is 30 by 15 by 6.25 inches and gives each driver 0.32 cubic feet net. This one is 41 by 12 by 5.9375 inches and gives each driver 0.323 cubic feet net. The height was solved to hold the same airspace as the standard box, so the alignment carries over.

The choice is about shape: the standard box if you have 15 inches of depth, this one when depth is the limit and you have 41 inches of run.

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. At 0.323 cubic feet net per chamber the system lands at Qtc 0.653 with Fc at 58.5 Hz and a predicted F3 of 63.6 Hz.

Smaller is genuinely better with this driver. Prodigy's larger figure reads like a target for prefab truck enclosures where cabin gain does more of the work.

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. Each NB3-10D4 has dual 4 ohm voice coils, so the way you wire the two coils on each driver sets the load the amplifier sees through the cup. Wire both drivers identically, and confirm the resulting load against your amplifier's minimum stable impedance before powering the system. Target 450 to 600 watts RMS per driver.

Side mounted, and there is one cup serving both chambers. 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 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 to both driver positions in parallel.

V-groove and dado joinery, CNC cut on ShopSabre routers from Langboard Elite MDF, so every panel joint locks mechanically before adhesive is applied. The front baffle is a 1.5 inch double layer with the outer layer machined as a flush recess, and each driver lands on 8/32 threaded inserts with stainless machine screws. A full-height bonded 3/4 inch divider separates the two chambers and ties the walls together across the 41 inch span. Corners are square, the Down Fire series standard, which keeps the most internal volume for the footprint. Assembled and inspected in Tullahoma, Tennessee.

No. Polyfill is already installed as a light wall lining in each chamber, and the quantity is chosen so it does not change the acoustic volume. Do not add more: packing a sealed box makes it behave as though it were larger, which walks the alignment away from the 0.323 cubic feet per chamber this cabinet was built to.

No. This listing is for the enclosure only. Bring your own pair of Prodigy NB3-10D4 subwoofers. The cutout and mounting depth are direct fit at both positions, and the 1.75 inch feet ship uninstalled for an installed height of 7.6875 inches.