Performance Optimized Down Fire Wide Sealed Dual 10" Shallow Sub Enclosure | Wavtech thinPRO10

The Down Fire Wide Format

Down Fire Wide is the Performance Optimized answer to a specific problem: the space under the rear seat of a truck or SUV, or a narrow cargo floor, is long and shallow, and a 30 by 15 inch Down Fire cabinet will not go in it.

So the cabinet is turned sideways. This one runs 41 inches wide by 12 inches deep by 5.9375 inches tall. It is the same thinPRO10, in a cabinet 3 inches shallower front to back than our standard 30 by 15 inch thinPRO10 cabinet and 11 inches longer. The airspace given up in depth is recovered along the length, so each driver still gets a properly sized chamber rather than a compromised one.

Performance, Performance Optimized, and Micro

Proline X builds three tiers of Down Fire enclosure. The difference is not finish or materials, it is whether the cabinet was designed for a category or for a driver, and how much of the fitting work is already done for you.

Built Around the thinPRO10

Nothing about this cabinet is generic. Both baffle positions are bored to the thinPRO10's 9.125 inch, 232mm cutout (Wavtech's product page figure; its manual prints 9-1/16 inch, 230mm, and we cut the larger to clear both), and the driver's 2.875 inch mounting depth is shallow enough that airspace, not the motor, sets this cabinet's height. Wāvtech publishes no rear clearance requirement behind these motors, because the magnet structure sits essentially flush with the frame rather than protruding into the airspace. That is why a two chamber cabinet for a pair of 750 watt drivers finishes at 5.9375 inches tall.

Each driver is offered as the thinPRO10-2 (2 ohm SVC) or the thinPRO10-4 (4 ohm SVC), rated 750 watts RMS and 2250 watts peak with 20mm of one way linear excursion and 54mm of peak to peak mechanical travel. Across the pair that is 1500 watts RMS combined and 683.5 cm² of cone area, roughly 6 dB more maximum output than a single driver.

The engineering is unusual for shallow drivers. 4.5 inch four layer high temp voice coils ride on vented polyimide composite formers. Cones are honeycomb Nomex and glass fiber composite, suspensions pair high excursion double roll NBR surrounds with dual internal mirrored NBR spiders, and the motors are FEA optimized dual gap structures with double stacked strontium magnets in vented cast aluminum frames.

Two Chambers, Not One

This enclosure follows the Proline X standing design rule for dual sealed builds: two fully separate chambers divided by a bonded full-height 3/4 inch MDF panel.

Two drivers sharing one sealed volume interact acoustically. Each driver's compression phase becomes the pressure environment the other is working against, which smears transient response and blurs the alignment each would have on its own. A full divider eliminates that entirely. Each thinPRO10 gets its own 0.395 cubic feet net and its own polyfill.

On a long cabinet the divider does structural work as well, tying the front and rear walls together at the centre of a 41 inch span. One shared side-mounted terminal cup feeds both driver positions, so the cabinet stays a single connection point.

Net Volume, Not Gross

We build this cabinet at 0.395 cubic feet net per chamber, 0.790 cubic feet net total, from a 0.863 cubic foot gross cavity, after the divider and the driver's published 0.028 cubic feet of displacement. Wāvtech's preferred sealed volume is a 0.35 cubic foot box per driver, so this cabinet sits slightly on the larger, better damped side of their target.

Because the chambers are separate, the alignment is stated per driver. With the thinPRO10-2, Fs 31 Hz and Qts 0.55, each chamber lands at Qtc 0.873, Fc 49.2 Hz, F3 41.6 Hz. With the thinPRO10-4, Fs 32 Hz and Qts 0.52, it lands at Qtc 0.825, Fc 50.8 Hz, F3 44.5 Hz, a more damped alignment that trades about three hertz of extension for tighter transient control. Both are single voice coil, so your final impedance is set by which model you buy, not by wiring.

Height is the free dimension. With the footprint fixed at 41 by 12, the cabinet height was solved to put each chamber on the 0.39 cubic feet the standard cabinet holds, then rounded up to the next sixteenth so the airspace lands on the target rather than under it. The motor clears the top panel by 2.31 inches against our 0.75 inch minimum, so airspace set the height here, not clearance.

Down Fire Wide Construction

Cut with V-groove and dado joinery on our ShopSabre routers from Langboard Elite 3/4 inch MDF, a dense 48.5 lb/ft³ board with a 200 psi internal bond and 410,000 psi MOE. Every panel joint is a machined interlocking groove that mechanically locks before adhesive is applied, which keeps both chambers airtight under sustained pressure cycling. Corners are square on Down Fire cabinets.

The cabinet measures 41 inches wide by 12 inches deep by 5.9375 inches tall, measured in the down fire position and excluding standoffs. The 1.75 inch standoffs ship uninstalled so you can place them to suit your floor; installed, the finished stack is 7.6875 inches. Plan the space around that figure, not the cabinet height.

Power and Wiring

Each thinPRO10 is rated 750 watts RMS and 2250 watts peak, 1500 watts RMS combined across the pair. Wāvtech's own recommended power range is 250 to 750 watts RMS per driver, and sensitivity is 81 dB on the -2 and 82 dB on the -4, so aim for the upper half of that range.

One side mounted terminal cup serves both chambers, pre-wired in 12 gauge OFC to both driver positions in parallel. Both variants are single voice coil, so a pair of thinPRO10-2 presents 1 ohm at the cup and a pair of thinPRO10-4 presents 2 ohms. Use two of the same model and confirm the load against your amplifier's minimum stable impedance before powering the system.

Bring your own pair of thinPRO10-2 or thinPRO10-4 subwoofers; the drivers are purchased separately. The enclosure carries a 1 year limited warranty.