Performance Optimized Down Fire Wide Sealed Dual 10" Shallow Sub Enclosure | ResoNix GUS-10

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 the standard 30 by 15 inch Down Fire cabinet will not go in it.

This cabinet takes the same pair of ResoNix GUS-10 and turns the footprint sideways. It runs 41 inches wide by 12 inches deep by 7.8125 inches tall: 3 inches shallower front to back than the standard 30 x 15 cabinet and 11 inches longer. The airspace given up in depth is recovered along the length, and each driver still gets its own separate chamber.

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 ResoNix GUS-10

Both baffle positions are bored to the GUS-10's 235.08mm cutout, 9.255 inches, and the cabinet height clears its 3.996 inch mounting depth with 3.07 inches above the motor. The 277.5mm frame sits on the 12 inch deep baffle.

GUS stands for Geometrically Uncompromised Subwoofer. A patent pending FEA optimized overhung motor. Copper and aluminum shorting rings plus a full length copper shorting sleeve outside the gap, with the voice coil between the former and the sleeve, which keeps inductance stable across stroke while pulling heat out of the coil. A titanium voice coil former that eliminates eddy current drag and directs heat away from the internal neodymium magnet. A Nomex honeycomb core cone with carbon fiber facing.

ResoNix publishes full Klippel LSI and TRF data for every GUS driver and commits to doing it for every production batch.

Net Volume and Alignment

Each chamber holds 0.607 cubic feet net, 1.214 cubic feet across both chambers, from 0.650 gross per chamber after the driver's 0.031 cubic feet of displacement.

Computed from ResoNix's published Thiele-Small parameters for each coil version, per coil version and per chamber: Dual 4-Ohm: Qtc 0.686, Fc 38.3 Hz, F3 39.5 Hz. Dual 2-Ohm: Qtc 0.602, Fc 36.0 Hz, F3 43.4 Hz.

Height is the free dimension. With the footprint fixed at 41 by 12, the cabinet height was solved to put each chamber on the 0.60 cubic feet the standard 30 x 15 cabinet was built to, then rounded up to the next sixteenth so the airspace lands on the target rather than under it. The 3.996 inch mounting depth leaves 3.07 inches above the motor, so airspace set the height here, not clearance.

The Dual 4-Ohm is the better acoustic match: ResoNix publishes 0.6 cubic feet as its volume for a 0.707 alignment, and each chamber here is within seven thousandths of it. The Dual 2-Ohm is designed around a smaller box, so in this chamber it runs a more damped alignment with tighter transient control at the cost of a few hertz. Use two drivers of the same coil version.

These are anechoic figures. Firing down into the floor, the sealed rolloff meets rising cabin gain, so in-car response extends below them.

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. Each driver gets its own 0.607 cubic feet and its own polyfill.

On a long cabinet the divider does structural work as well, tying the front and rear walls together at the center of a 41 inch span.

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, no radii. Polyfill is installed as a light wall lining, finished in plush black carpet.

The cabinet measures 41 inches wide by 12 inches deep by 7.8125 inches tall, measured in the down fire position, excluding standoffs. Custom-fit standoffs ship with the enclosure, uninstalled. They hold the 55mm ResoNix requires between the baffle surface and the floor, so plan the space around the cabinet height plus the standoffs.

Power and Wiring

ResoNix rates the GUS-10 at 500 watts RMS each, 1000 watts RMS across the pair, and states plainly that they do not underrate their drivers the way many manufacturers do. Burnt voice coils and damage from bottoming out are not covered under their warranty, and because these drivers stay linear right up to their limits it will not always be obvious when you are pushing too hard. An amplifier capable of more is fine so long as delivered power is held to the rating.

One side mounted terminal cup serves both chambers, pre-wired in 12 gauge OFC to both driver positions in parallel. Final impedance is set at the drivers: each GUS-10 is dual voice coil, so how you wire the two coils on each driver sets the load the amplifier sees. Use two of the same coil version, wire them identically, and confirm the load against your amplifier's minimum stable impedance.

Bring your own pair of GUS-10 in either coil version; the drivers are purchased directly from ResoNix Sound Solutions. The enclosure carries a 1 year limited warranty. Questions on fitment or amplifier matching, call 931-563-5151.