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

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

Nothing about this cabinet is generic. Both baffle positions are bored to the GUS-10's 235.08mm cutout, 9.255 inches, the internal height is set by its 3.996 inch mounting depth, and each chamber lands exactly on the 0.60 cubic feet ResoNix publishes for a 0.707 Qtc alignment on the Dual 4-Ohm.

The engineering is unusual for any subwoofer, let alone a shallow one. A patent pending FEA optimized overhung motor with high motor force and very low inductance. Copper and aluminum shorting rings plus a full length copper shorting sleeve that sits 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. Across every driver family in this program, that level of transparency is unique.

Net Volume, Not Gross

Each driver gets 0.60 cubic feet net, 1.20 cubic feet net across both chambers, out of 1.27 gross. Not approximately, not close enough: 0.60 is ResoNix's own published volume for a 0.707 Qtc alignment on the Dual 4-Ohm, and the cabinet was sized to land on it. The volume quoted is true net internal airspace after panel thickness, the divider, bracing and each driver's own 0.031 cubic feet of displacement are accounted for.

The Dual 4-Ohm is the better acoustic match here, landing at Qtc 0.688 with F3 at 39.5 Hz per chamber. The Dual 2-Ohm targets 0.4 cubic feet, so in this cabinet it runs larger than intended and lands at Qtc 0.603 with F3 at 43.4 Hz. That is a more damped alignment with tighter transient control at the cost of a few hertz, and a perfectly usable result. Use two drivers of the same coil configuration and wire them identically, since mismatched wiring between chambers splits power unevenly.

Two Drivers, Two Chambers

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 height bonded 3/4 inch MDF divider eliminates that completely. Each GUS-10 gets its own 0.60 cubic feet and its own polyfill. Separate chambers are the standing design rule on every Proline X dual sealed enclosure.

One side mounted terminal cup serves both chambers, pre-wired in 12 gauge OFC to both driver positions in parallel, so you do not run the chambers separately to the amplifier. Final impedance is set at the drivers. Each GUS-10 is dual voice coil, so how you wire the two coils on each driver determines the load the amplifier sees through the cup. Confirm that load against your amplifier's minimum stable impedance before powering the system.

Down Fire 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 30 inches wide by 15 inches deep by 8.3125 inches tall, measured in the down fire position and excluding standoffs. Plan the space around the installed height, not the cabinet height: the standoffs hold the 55mm ResoNix requires under the baffle, roughly 2.2 inches, so the finished stack sits near 10.5 inches tall.

Down Firing, Endorsed by the Manufacturer

ResoNix addresses the orientation question directly in their own documentation: there is very little real world difference in sound between down firing and up firing, and you should choose whichever makes the installation easier, more reliable and easier to service.

The GUS series also uses a vented rear cone assembly attached to the voice coil former, so the pole vent can be completely obstructed with no negative effect. That is what allows these chambers to be built without the rear motor clearance allowance most drivers require.

Power and Warranty

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. They also note these drivers stay linear and low in distortion right up to their limits, so 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.

The enclosure carries a 1 year limited warranty and ships with the standoffs. Bring your own pair of GUS-10 in either coil configuration; the drivers are purchased directly from ResoNix Sound Solutions.