A product graphic showing a Proline PO 12D-S GUS double speaker enclosure on a dark background, with text indicating dimensions (30.25 inches by 15 inches), material details, and compatibility with ResoNix GUS series.Close-up of a Proline X Performance PO 12D-S GUS woofer enclosure showing the interior with a beige wood cone, black mounting frame, visible screws, and wiring. A dark product info panel on the left lists features and notes compatibility with ResoNix GUS Series.A dark gray wedge-shaped car audio woofer shown on a black background with measurement labels indicating 15 inches tall, 13.5 inches wide, and 8 inches top width.

Performance Optimized · Datasheet

Performance Optimized Wedge Sealed Dual 12" Enclosure | ResoNix GUS-12 Dual 12" Sealed enclosure

Net volume
1.508 cu ft total, 0.754 cu ft per driver after 0.046 displacement
Max mounting depth
7.5 in
External dimensions
30.25 in W × 15 in at the seat face H × 13.5 in at the base D
Front baffle
1.5 in, double baffle
Buy at Audio Intensity
  • Driver: ResoNix GUS-12 x2, direct fit only
  • Net Acoustic: 0.754 cu ft per driver, ResoNix target 0.75
  • Alignment: Qtc 0.719, F3 36.7 Hz
  • Chambers: Dual, full divider
  • Position: Trunk mount, tall face against rear seat
  • Firing: Rearward. No down fire option
  • Footprint: 30.25 in W x 13.5 in D at the base
  • Weight: 48 lb

Technical specifications

SpecificationValue
SeriesProline X Performance Optimized Wedge
Compatible DriverResoNix GUS-12, quantity 2. Direct fit, no other driver
ConfigurationDual 12 inch, dual chamber sealed wedge
Mounting PositionTrunk or cargo area, tall face against the rear seat back
Firing DirectionRearward into the trunk. Not a down fire design, no feet included
External Width30.25 in
External Height15 in at the seat face
External Depth13.5 in at the base, tapering to 8 in at the top
Internal Volume, Gross1.60 cu ft total, 0.80 cu ft per chamber
Internal Volume, Net Acoustic1.508 cu ft total, 0.754 cu ft per driver after 0.046 displacement
ResoNix Published Target0.75 cu ft per driver for maximally flat alignment
Calculated Qtc0.719
Calculated fc37.3 Hz
Calculated F336.7 Hz, anechoic
Woofer Opening283.6mm direct fit, both positions
Max Mounting Depth7.5 in
Min Front Clearance28mm, both drivers
Driver Power Handling800 W RMS each, 1600 W combined
MaterialLangboard Elite MDF
ConstructionCNC cut, dado and V groove joinery
Panel Thickness0.75 in
Front Baffle1.5 in, double baffle
Chamber DividerFull divider, no shared airspace
Driver Mounting8/32 threaded inserts, stainless machine screws included, 304mm bolt circle
Terminal CupsOne Proline X ABS and carbon fiber composite, side mounted, pre wired 12 gauge OFC to both driver positions
DampingLight polyfill wall lining, does not alter acoustic volume
CarpetPlush black
BadgeWoofer face mounted, black lasered acrylic
Weight48 lb
Warranty1 Year Limited
Built InTullahoma, Tennessee

Performance in this enclosure

Net airspace
0.76
cu ft per chamber
System Qtc
0.67–0.72
sealed
Half power
36.7–36.7
Hz · F3
Xmax at
681
W RMS · no filter
With 25 Hz subsonic
1081
W RMS · +59%
Amplifier
800
W RMS recommended
This enclosure holds 0.76 cu ft net per chamber. In it the ResoNix GUS-12 runs a system Qtc of 0.67–0.72 with half power at 36.7–36.7 Hz, and the cone reaches its 20.0 mm travel limit at 681 W, below the driver’s 800 W thermal rating, so travel is what stops you here, not heat. Run a subsonic filter at 25 Hz and that becomes 1081 W — +400 W, or 59 percent more power for the same 20.0 mm of travel.

01Is it a sealed driver?

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

EBP = Fs ÷ Qes = 50.0–51.9
SEALED 0–50 TRANSITION 50–100 PORTED 100–150 0 50 100 150 D2 50.0 D4 51.9
D2 · EBP 50.0D4 · EBP 51.9
At 50.0–51.9 the GUS-12 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

0.76 cu ft against a 101.1 L Vas.

α = Vas ÷ Vb = 4.73  ·  Fc = Fs√(α+1) = 35–37 Hz  ·  Qtc = 0.67–0.72
20 30 50 70 100 150 200 +6 +0 -6 -12 -18 -24 FREQUENCY · Hz LEVEL · dB −3 dB
D2 · Qtc 0.67, Fc 35 Hz, F3 36.7 HzD4 · Qtc 0.72, Fc 37 Hz, F3 36.7 Hz
The box lifts resonance from 14.5 Hz free-air to 35–37 Hz and half power lands at 36.7–36.7 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 20.0 mm — and a bigger one once a subsonic filter stops it wasting travel below the passband.

PXmax = 681–700 W unfiltered  →  1081–1257 W with a 25 Hz subsonic
20 30 50 70 100 150 200 0 8 16 24 FREQUENCY · Hz CONE TRAVEL · mm PAST LINEAR TRAVEL · Xmax 20.0 mm 681 W reaches Xmax here
D2 · 700 W, no filterD4 · 681 W, no filterD2 · 1257 W with subsonic at 25 Hz, 24 dB/octD4 · 1081 W with subsonic at 25 Hz, 24 dB/octXmax 20.0 mm one-way
Every trace touches the limit and no further, because each is drawn at the exact power that puts that coil on 20.0 mm. Unfiltered that is 681 W, reached first at 20 Hz. It sits under the 800 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 1081 W before hitting the same 20.0 mm. That is 59 percent more amplifier for the price of one filter setting.
ParamValueUnitNote
Fs14.51Hzfree-air resonance
Qts0.280 / 0.280D2 / D4
Vas101.07 / 119.35Lequivalent compliance
Sd490.9cm²effective piston area
Xmax20mmone-way linear travel
Pe800Wcontinuous RMS
SPL82.1dB1 W / 1 m, derived from T/S

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

Installer's take

Wire the terminal cup before you set this box in the trunk. Once the tall face is against the seat back there is no getting behind it, and on a wedge you cannot tip it forward to reach the cup. Land it, test continuity, then position.

Confirm both drivers are moving in the same direction before the box goes in. It is a thirty second check with a battery and it is the difference between finding a reversed pair now and pulling the box back out later wondering where the bottom end went.

Measure the base depth, not the top. The cabinet is 13.5 inches deep at the trunk floor and 8 inches at the top, and it is 30.25 wide. The taper exists so the lid clears. The floor dimension is what decides the sale.

Each chamber is 0.80 gross, and the GUS-12 displaces 0.046, which puts every driver at 0.754 net against the 0.75 ResoNix publishes. If you have run a GUS-12 in something bigger and thought it needed more box, look at the numbers before you act on that. F3 stays inside a 36 to 39 Hz band from 0.45 all the way to 1.5 cubic feet. Bigger does not go lower on this driver. It only changes the shape.

There is a real cost to going bigger too. ResoNix notes the GUS-12 hits xmax at 20 Hz on 500 watts in a 1.5 cubic foot box, and it is rated for 800. Build it large and you give up a third of your power handling for damping you did not need. At 0.75 the driver takes everything the amp has.

Do not add polyfill. The light wall lining is there to control internal reflections and nothing more. Stuffing to a working density raises effective volume and moves the alignment off target.

Check the 28mm clearance at both driver positions independently, not once. Because these fire rearward into the trunk, that envelope is your cargo area. The two positions can face completely different obstructions depending on how the box sits and what you load beside it.

Questions

Can this enclosure be run down firing?

No. This is a trunk mounted wedge and it works in one orientation only. The tall face sits flat against the back of the rear seat, the cabinet tapers away toward the trunk lid, and the drivers fire rearward into the trunk. There are no feet and no baffle clearance gap. ResoNix themselves note there is very little real world difference in sound between down firing and up firing, so the orientation here is an installation decision rather than an acoustic compromise.

Will a standard 12 inch subwoofer fit this enclosure?

No. The openings are cut direct fit to the ResoNix GUS-12 at 283.6mm, and the chamber volume is built around that driver. A standard 12 will not fit the opening and would not see the correct airspace if it did. That is what Performance Optimized means on this line. The enclosure is designed backward from one driver rather than sized to a diameter class.

Why is the gross volume 0.80 cubic feet per chamber but the net acoustic volume 0.75?

Gross volume is the empty chamber. Net acoustic volume is what the driver actually loads into after its own body displaces air. Each GUS-12 displaces 0.046 cubic feet. Each chamber is built at 0.80 cubic feet gross, so after the driver goes in the working airspace is 0.754 cubic feet, which is ResoNix's published 0.75 target. Across two chambers that is 1.60 gross and 1.508 net acoustic. The net figure is the one to enter into a modeling program.

Why not build a bigger box for more low end?

Because on this driver a bigger box does not buy low end. Running ResoNix published parameters, F3 stays inside a 36 to 39 Hz band across their entire recommended range from 0.45 up to 1.5 cubic feet. Volume changes the character of the response, not how deep it plays. There is also a real cost. ResoNix notes that at 1.5 cubic feet the GUS-12 reaches xmax at 20 Hz with only 500 watts, well under its 800 watt rating, so the larger box trades away power handling. At 0.75 cubic feet the driver takes its full rated power.

Is this a common chamber or dual chamber enclosure?

Dual chamber. A full divider separates the two 0.80 cubic foot chambers and there is no shared airspace between them. Each driver loads independently, so one cone's motion does not modulate the air load the other driver sees under hard excursion. That is an acoustic separation, which is the one that matters for how the pair behaves.

Why does a dual enclosure have only one terminal cup?

One cup is the standard across the Proline X wedge range, and it is not related to how many chambers the cabinet has. A second cup gets added only when the driver's power rating makes splitting the load across two terminal sets the safer choice under sustained output, and at that power level there is often a reason to run a separate amplifier on each subwoofer. The GUS-12 at 800 watts RMS each does not need either. The GUS-15, at 1500 watts each, does, which is why the dual 15 wedge is built with two. This is an enclosure only product, so how the drivers are wired from the cup is left entirely to the installer.

What clearance do the GUS-12s need in front of the drivers?

ResoNix specifies 28mm minimum clearance in front of each GUS-12, measured from the height of the surround. At more than 20mm of Klippel verified one way excursion, that is the operational envelope of the suspension rather than optional headroom. Since the drivers fire rearward into the trunk, this is also a cargo question. Anything loaded behind the enclosure needs to stay outside that envelope, and both positions should be verified independently.

Does this include the ResoNix GUS-12 subwoofers?

No. This is an enclosure only product and the two GUS-12 drivers are purchased separately from ResoNix Sound Solutions. The enclosure ships with 8/32 threaded inserts installed at both positions, stainless machine screws, two pre wired terminal cups, and polyfill wall lining already installed. Audio Intensity is the exclusive enclosure builder for the ResoNix GUS platform.

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