A dark gray Proline PO 10-S DF GUS speaker shown on a black promotional graphic with dimensions labeled 30 inches wide and 5.1 inches high, plus feature text and the Proline and ResoNix branding.

A black Proline ResoNix PO 10-S DF GUS woofers subwoofer enclosure box shown on a dark brown gradient background with product specifications and branding.

A promotional product graphic for a Proline Performance Optimized Series PO 10-S DF GUS speaker. The image shows a dark gray rectangular woofer with a circular custom terminal cup, annotated with dimensions of 5.

A black rectangular speaker enclosure with a circular cutout showing a white interior, labeled as a 30 by 15 inch GUS series speaker. The image includes branding for Proline and ResoNix, along with text describing the PO 10-S DF GUS features and performance optimized series.

Proline X

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

Q: Why does this enclosure come with standoffs?

Because ResoNix specifies a minimum clearance in front of the cone, and on a down fire enclosure the thing in front of the cone is the floor. Their requirement for the GUS-10 is 23mm between the surround and the obstruction, or 55mm measured from the baffle surface.This cabinet ships with custom-fit standoffs machined to hold that clearance. Setting a down fire GUS enclosure flat on the floor would restrict the driver and compromise both output and mechanical safety. The standoffs are a required part of the design, not an accessory.

Q: Is down firing acceptable for a GUS subwoofer?

Yes, and ResoNix addresses it directly. Their published guidance is that there is very little real world difference in sound between down firing and up firing, and that you should choose whichever makes the installation easier, more reliable, and easier to service.That endorsement comes from the driver's manufacturer rather than from us, which is worth noting given how often down fire orientation gets debated. The one requirement is maintaining their specified clearance in front of the cone, which the included standoffs handle.

Q: Should I choose the Dual 2-Ohm or Dual 4-Ohm GUS-10?

For this cabinet, the Dual 4-Ohm is the better acoustic match. ResoNix targets 0.6 cubic feet for 0.707 Qtc on the D4, and this enclosure delivers 0.59 net, landing at Qtc 0.694 with F3 at 39.5 Hz.The D2 targets 0.4 cubic feet, so in this enclosure it runs larger than intended and lands at Qtc 0.609 with F3 at 43.2 Hz. That is a more damped alignment: tighter transient control and a gentler rolloff, at the cost of a few hertz of extension. It is a perfectly usable result, just not the volume ResoNix designed the D2 around. Choose based on your amplifier's preferred load first, since both work well here.

Q: Does the pole vent need to stay unobstructed?

No, and this is a deliberate design feature of the GUS series. The cone uses a vented rear assembly attached to the voice coil former, which handles venting even when the pole vent is completely blocked. ResoNix states in their own documentation that the pole vent can be fully obstructed with no negative side effects.That is why this cabinet can be built without the rear motor clearance allowance most drivers require, which keeps the enclosure shorter than it would otherwise need to be.

Q: How much power should I run to the GUS-10?

500 watts RMS, and not more. ResoNix is unusually direct about this: they state that the GUS series is not deliberately underrated the way many manufacturers rate their drivers, and that burnt voice coils or damage from bottoming out are not covered under warranty.You can safely use an amplifier capable of more output so long as power delivered to the driver is limited to 500 watts. ResoNix also notes that because these drivers stay linear and low distortion right up to their limits, it will not always be obvious when you are pushing too hard, which is exactly why the rating should be respected.

Q: Where is the terminal cup located on a down fire enclosure?

Side mounted. 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 the baffle faces 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.

Q: How is this enclosure built?

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 is what keeps the cabinet airtight under sustained pressure cycling.The front baffle is a double layer at 1.5 inches, two bonded 3/4 inch sheets, with the outer layer machined as a flush recess so the driver bolts to the inner layer. Perimeter cross-bracing and pre-installed polyfill complete the build, and custom-fit standoffs are included to maintain ResoNix's required floor clearance. Assembled and inspected in Tullahoma, Tennessee.

Q: Is the ResoNix GUS-10 subwoofer included with this enclosure?

No. This listing is for the enclosure only, and includes the custom-fit standoffs. The ResoNix GUS-10 must be purchased directly from ResoNix Sound Solutions. The cutout and mounting depth are direct fit for either the Dual 2-Ohm or Dual 4-Ohm version.

SKU: PO 10-S DF GUS

QUICK SPECS

Alignment: 0.59 cu ft net. Qtc 0.694 / F3 39.5 Hz (D4), Qtc 0.609 / F3 43.2 Hz (D2)
Driver: ResoNix GUS-10 D2 or D4, 500W RMS, 18mm Xmax, 3.996" mounting depth
Rear Venting: Vented rear cone, pole vent may be fully blocked
Standoffs: Included, ResoNix specifies 55mm from baffle surface to the floor, installed height near 7.3 in
Cabinet: 30"W x 15"D x 5.125"H in down fire position, excludes standoffs, square corners

Shipping Included No freight charges at checkout. What you see is what you pay.

Built in Tennessee CNC cut from 3/4" Langboard Elite MDF. V-groove and dado joinery.

Advanced Terminal Cup Built in-house. ABS/Carbon Fiber. Stainless steel hardware. Copper ring terminals.

$ 249.99

In Stock and Ready to Ship

Financing available. Choose Shop Pay Installments at checkout.

Complete Your System

Goldhorn Goldhorn DSP10 | 10-Channel Standalone DSP for Audiophile Sound Quality $ 599.99

Wavtech Wavtech Link5001Mini $ 299.99

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

$ 249.99

Enclosure Type Sealed

External Dimensions 30" W x 15" D x 5.125" H (measured in down fire position, excludes standoffs)

Gross Volume 0.64 cu ft

Net Volume 0.59 cu ft

Weight 30.5 lbs

Front Panel Thickness 1.5"

INSTALLER'S TAKE

ResoNix publishes full Klippel LSI and TRF data for every GUS driver, promises to do it for every production batch, and their enclosure recommendations reconcile exactly with their own T/S parameters. Across sixteen driver families in this program, that combination is unique. Most manufacturers publish an enclosure table that disagrees with their own spec sheet by 10 Hz or more and hope nobody checks.

The GUS-10 is a 500 watt shallow 10 with 18mm of verified excursion in a 4 inch mounting depth, and the engineering is not marketing language. A patent pending full length copper shorting sleeve sitting outside the gap with the coil between the former and the sleeve. A titanium voice coil former, which eliminates eddy current drag and pushes heat away from the internal neo magnet. A Nomex honeycomb cone with carbon fiber facing. This is a genuinely expensive way to build a subwoofer.

Two practical things about this cabinet. First, the vented rear cone assembly means the pole vent can be fully blocked with no penalty, which is why we do not have to leave the usual clearance allowance behind the motor. ResoNix says this outright in their FAQ.

Second, and this is the one people miss: ResoNix requires 55mm of clearance from the baffle surface to whatever sits in front of the cone. On a down fire box that is the floor. This cabinet ships with custom-fit standoffs that hold that clearance. Set it flat on the carpet and you will restrict the driver.

On volume: the D4 wants 0.6 and gets 0.59 here, essentially perfect. The D2 wants 0.4 and gets 0.59, which lands at Qtc 0.609. That is more damped than ResoNix targets, meaning tighter and slightly less upper bass. Both are good; the D4 is the better match to this cabinet.

500 watts RMS, and ResoNix means it. They state plainly that they do not underrate their drivers to impress anyone and that overpower damage is not warranty work.

Product Details

Proline X Performance Optimized Down Fire 10" Sealed

Cut and tuned for the ResoNix GUS-10

V-Groove and DadoLangboard Elite MDF0.59 cu ft NetStandoffs Included

0.59cu ft net

0.694system Qtc, D4

39.5-43.2 HzF3 rolloff

5.125 incabinet height, excludes standoffs

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.

	Performance	Performance Optimized	Micro Series
Fitment	Universal. Accepts any subwoofer that clears the published cutout and mounting depth.	Woofer specific. Cut for one named subwoofer, with cutout, mounting depth, magnet clearance and displacement drawn in CAD from that driver.	Woofer specific. Cut for one named subwoofer.
Footprint	Sized to the driver diameter. 24.5 by 13.5 inches on the 10 inch.	Shared 30 by 15 inch platform on most builds, with cabinet height as the variable. A few drivers need a wider or deeper platform.	Compact per driver footprint. 21.5 by 14.5 inches on the 10 inch.
Front baffle	Single, 3/4 inch.	Double, 1.5 inch, outer layer machined as a flush recess.	Double, 1.5 inch.
Driver mounting	Solid flange. You drill your own mounting holes.	8/32 threaded inserts, stainless machine screws included.	8/32 threaded inserts, stainless machine screws included.
Joinery	V-groove and dado, CNC cut.	V-groove and dado, CNC cut, perimeter cross brace.	Stack fab, dowel reinforced.
Published alignment	Modeled Qtc profiles across a range of drivers. No single response curve.	A real predicted Qtc and F3 for that exact driver, calculated from its own Thiele-Small parameters.	Target alignment described in the listing.
Carpet	Gray standard, black optional.	Plush black.	Plush black.
Warranty	1 year limited.	1 year limited.	2 years.

Feet ship with every tier, uninstalled on purpose. Mount them where your floor wants them for a down fire install, or leave them off and run the cabinet front firing or up firing. The orientation is yours to choose.

This page is a Performance Optimized enclosure. The airspace, the cutout and the cabinet height all come from the ResoNix GUS-10's own published numbers. A Performance box fits your subwoofer. A Performance Optimized box was built for it.

Built Around the ResoNix GUS-10

Nothing about this cabinet is generic. The baffle is bored to the GUS-10's 235.08mm cutout, the internal height is set by its 3.996 inch mounting depth, and the volume lands within a hundredth of the figure ResoNix publishes for a 0.707 Qtc alignment on the Dual 4-Ohm.

GUS stands for Geometrically Uncompromised Subwoofer, and the engineering behind the name is not marketing language. A patent pending FEA optimized overhung motor. A full length copper shorting sleeve sitting 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 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

We build this cabinet at 0.59 cubic feet net, against ResoNix's published 0.6 for the Dual 4-Ohm. The volume quoted is true net internal airspace after panel thickness, bracing and the driver's own 0.031 cubic feet of displacement are accounted for.

True net, not marketing net. Internal volume is calculated from the machined cavity dimensions and the driver's published displacement, not estimated from external dimensions minus wall thickness.

The Dual 4-Ohm is the better acoustic match here, landing at Qtc 0.694 with F3 at 39.5 Hz. The Dual 2-Ohm targets 0.4 cubic feet, so in this cabinet it runs larger than intended and lands at Qtc 0.609 with F3 at 43.2 Hz. That is a more damped alignment with tighter transient control at the cost of a few hertz, and a perfectly usable result.

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 the cabinet airtight under sustained pressure cycling. Corners are square on Down Fire cabinets.

The cabinet measures 30 inches wide by 15 inches deep by 5.125 inches tall, measured in the down fire position and excluding standoffs. Plan the space around the installed height rather than the cabinet height: the standoffs hold the 55mm ResoNix requires under the baffle, roughly 2.2 inches, so the finished stack sits near 7.3 inches tall.

Double Baffle, Flush Recess

The front baffle is 1.5 inches, two bonded 3/4 inch sheets, with the outer layer machined as a flush recess so the driver bolts to the inner layer. That recovers 3/4 inch of internal clearance.

Side-Mounted Terminal Cup

Proline X ABS and carbon fiber composite cup with stainless hardware and copper ring terminals, pre-wired in 12 gauge OFC. Side mounted so it stays accessible with the baffle facing the floor.

Standoffs Included

ResoNix specifies 55mm minimum from the baffle surface to whatever sits in front of the cone. On a down fire cabinet that is the floor, so custom-fit standoffs ship with every enclosure.

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 this cabinet to be built without the rear motor clearance allowance most drivers require.

Power and Warranty

ResoNix rates the GUS-10 at 500 watts RMS 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 composed right up to their limits, so it will not always be obvious when you are pushing too hard.

The enclosure carries a 1 year limited warranty. Bring your own GUS-10 in either coil configuration; the driver is purchased directly from ResoNix Sound Solutions.

Cut for the Driver, Not the Catalog

This enclosure ships with custom-fit standoffs and a 1 year limited warranty, built one at a time in Tullahoma, Tennessee.

Specifications

Series	Proline X Performance Optimized Down Fire
Compatible Driver	ResoNix GUS-10, Dual 2-Ohm or Dual 4-Ohm. Direct fit, no other driver
Enclosure Type	Sealed, down fire, floor coupled
Firing Direction	Downward into the floor. Standoffs included and required
External Width	30 in
External Depth	15 in
External Height	5.125 in, measured in down fire position, excludes standoffs
Internal Volume, Gross	0.62 cu ft
Internal Volume, Net Acoustic	0.59 cu ft after displacement
ResoNix Target For 0.707 Qtc	0.6 cu ft (D4) / 0.4 cu ft (D2)
System Qtc	0.694 (D4) / 0.609 (D2)
Predicted F3	39.5 Hz (D4) / 43.2 Hz (D2)
Driver Fs	21.76 Hz (D4) / 20.37 Hz (D2)
Driver Qts	0.39 (D4) / 0.34 (D2)
Driver Vas	36.035 L (D4) / 36.634 L (D2)
Driver Xmax	18mm, Klippel verified
Driver Displacement	0.031 cu ft, published by ResoNix
Driver Power Handling	500 W RMS. Do not exceed
Driver Cone	Nomex honeycomb core with carbon fiber facing
Driver Voice Coil	Copper on titanium former
Driver Motor	Patent pending FEA optimized overhung, full length copper shorting sleeve, copper and aluminum shorting rings
Rear Venting	Vented rear cone assembly. Pole vent may be fully obstructed
Mounting Depth	101.5mm / 3.996 in, ResoNix spec
Woofer Opening	235.08mm direct fit
Driver Outer Diameter	277.5mm with gasket
Min Front Clearance	55mm from baffle surface, ResoNix spec
Standoffs	Custom fit, included
Material	Langboard Elite MDF
Construction	CNC cut, dado and V groove joinery, perimeter cross brace
Panel Thickness	0.75 in
Front Baffle	1.5 in double baffle, outer layer flush recess
Corner Profile	Square, Down Fire series standard
Driver Mounting	8/32 threaded inserts, stainless machine screws included
Terminal Cup	Proline X ABS and carbon fiber composite, side mounted
Internal Wiring	12 gauge OFC
Damping	Polyfill pre-installed
Carpet	Plush Black
Weight	26 lb
Warranty	1 Year Limited
Built In	Tullahoma, Tennessee

Performance Graphs

Net airspace

0.59

cu ft per chamber

System Qtc

0.61–0.69

sealed

Half power

39.5–43.3

Hz · F3

Xmax at

439

W RMS · no filter

With 25 Hz subsonic

726

W RMS · +65%

Amplifier

500

W RMS recommended

This enclosure holds 0.59 cu ft net per chamber. In it the ResoNix GUS-10 runs a system Qtc of 0.61–0.69 with half power at 39.5–43.3 Hz, and the cone reaches its 18.0 mm travel limit at 439 W, below the driver’s 500 W thermal rating, so travel is what stops you here, not heat. Run a subsonic filter at 25 Hz and that becomes 726 W — +287 W, or 65 percent more power for the same 18.0 mm of travel.

01Is it a sealed driver?

Efficiency bandwidth product places the motor before anything else is decided.

EBP = Fs ÷ Qes = 54.4–59.9

D2 · EBP 59.9D4 · EBP 54.4

At 54.4–59.9 the GUS-10 sits in the transition band, not the sealed band. That is not a mismatch: a transition motor works in either alignment, and sealed buys a smaller box and a gentler roll-off at the cost of some low-end output. Stage 02 shows what this airspace actually does with it.

02What the box does to it

0.59 cu ft against a 36.6 L Vas.

α = Vas ÷ Vb = 2.19 · Fc = Fs√(α+1) = 36–39 Hz · Qtc = 0.61–0.69

D2 · Qtc 0.61, Fc 36 Hz, F3 43.3 HzD4 · Qtc 0.69, Fc 39 Hz, F3 39.5 Hz

The box lifts resonance from 20.4 Hz free-air to 36–39 Hz and half power lands at 39.5–43.3 Hz, anechoic, before any cabin gain. This enclosure ships without a driver, so both coil variants the maker offers are plotted. They do not load the same box the same way.

03The watts that reach Xmax (in this enclosure)

Travel scales with the square root of power, so there is one wattage that puts the cone exactly on 18.0 mm — and a bigger one once a subsonic filter stops it wasting travel below the passband.

P_Xmax = 439–459 W unfiltered → 726–806 W with a 25 Hz subsonic

D2 · 439 W, no filterD4 · 459 W, no filterD2 · 806 W with subsonic at 25 Hz, 24 dB/octD4 · 726 W with subsonic at 25 Hz, 24 dB/octXmax 18.0 mm one-way

Every trace touches the limit and no further, because each is drawn at the exact power that puts that coil on 18.0 mm. Unfiltered that is 439 W, reached first at 20 Hz. It sits under the 500 W the driver can take thermally, so the enclosure sets the ceiling, not the voice coil. The dashed traces are the same driver behind a subsonic filter at 25 Hz, 24 dB/oct: stopping the cone wasting travel below the passband lets it take 726 W before hitting the same 18.0 mm. That is 65 percent more amplifier for the price of one filter setting.

Param	Value	Unit	Note
Fs	20.37	Hz	free-air resonance
Qts	0.340 / 0.390		D2 / D4
Vas	36.63 / 36.03	L	equivalent compliance
Sd	346.4	cm²	effective piston area
Xmax	18	mm	one-way linear travel
Pe	500	W	continuous RMS
SPL	81.4	dB	1 W / 1 m, derived from T/S

Driver parameters as published by resonixsoundsolutions.com. Curves computed against this enclosure’s actual net airspace.

Materials

Material

Built From a Spec Sheet, Not a Sales Sheet

Every Proline X Performance Series enclosure is CNC-cut from Langboard Elite MDF, 3/4" (18mm) panels produced to published mill specifications. Most enclosure manufacturers source generic MDF without published data. We can tell you the internal bond rating, the modulus of elasticity, the modulus of rupture, and the face and edge screw holding strength for every panel in this enclosure, because we chose the material based on those numbers, not on price or availability.

Langboard Elite is produced in the United States. The specifications below are pulled directly from Langboard's published mill data and are verifiable. This is the same panel stock used in our full Proline X lineup.

Specifications

Langboard Elite MDF: Published Mill Data

Property	Value	Why It Matters
Panel Stock	Langboard Elite MDF	Named, verifiable panel source, not generic "high-density MDF"
Thickness	3/4" (18mm)	Industry standard for subwoofer enclosures; panels below this flex under pressure
Density	48.5 lbs/ft³	Higher density = less porosity, better screw retention, reduced resonance
Internal Bond	200 psi	Measures resistance to delamination under sustained internal pressure. The most enclosure-relevant spec on this sheet
Modulus of Rupture (MOR)	4,200 psi	Bending strength before the panel breaks, relevant for larger unsupported baffle spans
Modulus of Elasticity (MOE)	410,000 psi	Stiffness under load; higher MOE means less panel flex under bass pressure, less resonance
Face Screw Holding	325 lbs	How firmly the panel surface holds a screw; critical for baffle joint integrity over time
Edge Screw Holding	250 lbs	Panel edge retention, relevant for every joint that isn't face-to-face

Internal Bond

200 psi: The Number That Actually Matters for Enclosures

The internal bond rating measures how well the MDF panel resists delamination under sustained pressure applied perpendicular to the face. In a subwoofer enclosure, every bass transient generates a pressure pulse that pushes outward on every panel simultaneously. A panel that begins to delaminate internally loses stiffness gradually. The symptoms are slow: a box that starts to sound softer, less defined, less punchy over months of use. 200 psi internal bond is the spec that determines how long this enclosure holds its acoustic integrity under daily use at real power levels.

Stiffness

410,000 psi MOE: Less Flex, Less Resonance

The modulus of elasticity measures panel stiffness, its resistance to bending under load. A stiffer panel flexes less under the pressure generated by a high-excursion driver at volume. Panel flex is a source of acoustic coloration: the panel itself begins to radiate sound at its own resonant frequency, adding distortion to the output. 410,000 psi stiffness combined with V-groove and dado joinery means the panels stay rigid and the bracing controls resonance at the structure level, not the panel level. The bass you hear comes from the driver, not the box.

Screw Holding

325 lb Face / 250 lb Edge: Joints That Stay Locked

Screw holding strength determines how firmly the panel grips a fastener at the face and at the edge. This matters most at the baffle joint, where the front panel meets the side panels and where the driver is mounted. A panel with low screw holding strength allows fasteners to loosen over time under vibration, leading to air gaps at the joint and loss of acoustic seal. 325 lb face screw holding strength means the baffle hardware stays put. Combined with dado joinery and adhesive, the front panel on a Proline X Performance Series enclosure is not going anywhere.

Sourcing

Named Panel Stock: Not "Premium MDF"

The phrase "premium MDF" or "high-density MDF" appears on marketing copy for enclosures across every price point, from $40 to $400. It is not a specification. It is a description with no defined standard. Langboard Elite is a named, sourced, mill-documented product with published data. We name it in our copy because naming it holds us accountable to the spec. You can look up Langboard Elite independently, verify the numbers on this page, and confirm you are getting what we say you are getting. That is the point.

Why Proline X?

Most enclosures are built to a price point. Proline X is built to a spec. Every box starts with published-data MDF, gets CNC-cut to exact internal volume, and is assembled by hand in our Tennessee facility. The difference shows up in the measurements, and in how the box holds up two years into daily use.

CNC-Cut to Spec

Panels are machine-cut on ShopSabre CNC routers and joined with V-groove and dado joinery. Consistent geometry, no hand-cut variance, no gaps at the joints.