Proline X PO 10D-S DF GB10 sealed down fire enclosure, product photos pending. Placeholder graphic reading Photos Coming Soon.

Performance Optimized · Datasheet

Performance Optimized Down Fire Sealed Dual 10" Enclosure | Audiofrog GB10 Dual 10" Sealed enclosure

Net volume
1.20 cu ft total, 0.60 per driver
Max mounting depth
6.81 in available, 6.260 in required by the driver
Cutout
9.2520 in
External dimensions
30 in W × 9.06 in measured in the down fire position H × 15 in D
Buy at Audio Intensity
  • Best For: Dual Audiofrog GB10 Floor-Firing Trunk Builds
  • Net Volume: 0.60 cu ft per driver (0.73 cu ft Gross per chamber)
  • Alignment: Qtc 0.823 to 0.848, fc 51.6 to 52.6 Hz, F3 44.4 to 46.3 Hz, identical to our wedge version
  • Driver Match: Pair of Audiofrog GB10 (matched), GB10D2 or GB10D4
  • Impedance: Switch selected, 1 or 4 ohms per driver on the D2, 2 or 8 on the D4
  • Construction: Dual Chamber | Down-Firing Sealed | V-Groove/Dado | Double 1.5" Baffle | Threaded Inserts | Feet Included

Technical specifications

SpecificationValue
SeriesProline X Performance Optimized Down Fire
Compatible DriverAudiofrog GB10, quantity 2. Direct fit
ConfigurationDual 10 inch, dual chamber sealed down fire
Mounting PositionTrunk or cargo floor, cones firing downward
Firing DirectionDownward into the floor. Feet included, uninstalled
External Width30 in
External Depth15 in
External Height9.06 in measured in the down fire position
Internal Volume, Gross1.46 cu ft total, 0.73 per chamber
Internal Volume, Net Acoustic1.20 cu ft total, 0.60 per driver
AlignmentQtc 0.823 to 0.848, fc 51.6 to 52.6 Hz, F3 44.4 to 46.3 Hz anechoic
Driver Cutout9.2520 in
Driver Mounting Depth6.81 in available, 6.260 in required by the driver
Floor Slot Ratio0.95 at the standard 1.75 in standoff
Power Handling1000 watts RMS total across the pair
ImpedanceSwitch selected on the driver. D2 selects 1 or 4 ohms, D4 selects 2 or 8
Xmax17.6 mm one way on the D2, 19 mm on the D4
MaterialLangboard Elite MDF
ConstructionCNC cut, V-groove and dado joinery
Panel Thickness0.75 in
Baffle1.5 in, double layer, outer layer machined as a flush recess
Internal BracingFull chamber divider
Driver MountingThreaded inserts at every mounting location, stainless machine screws included
Terminal CupsOne Proline X ABS and carbon fiber composite, side mounted, pre wired 12 gauge OFC
FeetIncluded, uninstalled
DampingLight polyfill wall lining, does not alter acoustic volume
CarpetPlush black
Weight36.8 lb
Warranty1 Year Limited
Built InTullahoma, Tennessee

Performance in this enclosure

Net airspace
0.60
cu ft per chamber
System Qtc
0.82–0.85
sealed
Half power
44.4–46.3
Hz · F3
Xmax at
646
W RMS · no filter
With 25 Hz subsonic
705
W RMS · +9%
Amplifier
500
W RMS recommended
This enclosure holds 0.60 cu ft net per chamber. In it the Audiofrog GB10 runs a system Qtc of 0.82–0.85 with half power at 44.4–46.3 Hz, and the cone reaches its 17.6 mm travel limit at 646 W, above the driver’s 500 W thermal rating, so heat stops you before travel does. Run a subsonic filter at 25 Hz and that becomes 705 W — +60 W, or 9 percent more power for the same 17.6 mm of travel.

01Is it a sealed driver?

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

EBP = Fs ÷ Qes = 57.4–59.3
SEALED 0–50 TRANSITION 50–100 PORTED 100–150 0 50 100 150 D2 57.4 D4 59.3
D2 · EBP 57.4D4 · EBP 59.3
At 57.4–59.3 the GB10 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

0.60 cu ft against a 30.0 L Vas.

α = Vas ÷ Vb = 1.77  ·  Fc = Fs√(α+1) = 52–53 Hz  ·  Qtc = 0.82–0.85
20 30 50 70 100 150 200 +6 +0 -6 -12 -18 -24 FREQUENCY · Hz LEVEL · dB −3 dB
D2 · Qtc 0.85, Fc 52 Hz, F3 44.4 HzD4 · Qtc 0.82, Fc 53 Hz, F3 46.3 Hz
The box lifts resonance from 31.0–32.0 Hz free-air to 52–53 Hz and half power lands at 44.4–46.3 Hz, anechoic, before any cabin gain. This down-fire cabinet holds exactly the same volume per chamber as the wedge version, so the two are acoustically the same enclosure in two shapes and these numbers describe both. Choose between them on where the cabinet has to sit, not on how it performs. Audiofrog publishes a different free-air resonance and compliance for each coil variant rather than one shared pair, so both are carried here rather than averaged.

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 17.6 mm — and a bigger one once a subsonic filter stops it wasting travel below the passband.

PXmax = 646–678 W unfiltered  →  705–748 W with a 25 Hz subsonic
20 30 50 70 100 150 200 0 4 8 12 16 20 FREQUENCY · Hz CONE TRAVEL · mm PAST LINEAR TRAVEL · Xmax 17.6 mm 646 W reaches Xmax here
D2 · 646 W, no filterD4 · 678 W, no filterD2 · 705 W with subsonic at 25 Hz, 24 dB/octD4 · 748 W with subsonic at 25 Hz, 24 dB/octXmax 17.6 mm one-way
Every trace touches the limit and no further, because each is drawn at the exact power that puts that coil on 17.6 mm. Unfiltered that is 646 W, reached first at 29 Hz. It sits above the 500 W the driver can take thermally, so the voice coil gives up before the suspension does. 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 705 W before hitting the same 17.6 mm. That is 9 percent more amplifier for the price of one filter setting.
ParamValueUnitNote
Fs31.00 / 32.00Hzfree-air resonance
Qts0.510 / 0.500D2 / D4
Vas30.00 / 29.00Lequivalent compliance
Sd346.3cm²effective piston area
Xmax17.6mmone-way linear travel, D2 coil. The D4 coil is rated 19 mm on the same cone; the smaller figure is plotted so the power shown is conservative for both.
Pe500Wcontinuous RMS
SPL84.0dB1 W / 1 m, derived from T/S

Driver parameters as published by audiofrog.com and the GB Series Subwoofer Manual. Curves computed against this enclosure’s actual net airspace.

Installer's take

0.60 cubic feet net per driver at Qtc 0.823 to 0.848 and F3 44.4 to 46.3 Hz anechoic, computed from Audiofrog's published Thiele-Small. That is their own recommended sealed volume.

This cabinet holds the same 0.60 cubic feet per driver as our wedge version of the same pair, so the two publish the same Qtc and the same F3. They are the same enclosure in two shapes. Pick the one that fits where the cabinet has to live.

Read the impedance section before you mount anything. The GB series does not bring its coils out to the terminals. Each driver carries an impedance selection switch, and the terminal cup wires the two positions in parallel, so the switch alone decides what the amplifier sees. Set both drivers to the HIGH position. A pair of D2 drivers at 4 ohms each presents 2 ohms; a pair of D4 drivers at 8 ohms each presents 4 ohms. Leaving both in the low position halves that again, to 0.5 ohms on a D2 pair, which almost no amplifier is stable into. Set both switches the same way and set them before you mount the drivers, because the switch faces the motor.

On floor clearance: at the standard 1.75 inch standoff the slot around each cone is 0.95 of the cone area. Every 10 inch down fire cabinet sits there, it is the driver diameter rather than the box, and taller feet raise it if your floor allows.

Measure the height. This cabinet is 9.06 inches tall in the down fire position, on a 30 by 15 inch footprint.

Questions

Will this enclosure fit both the GB10D2 and the GB10D4?

Yes. The two coil versions share a frame, a 9.2520 in cutout and the same 6.260 in mounting depth, so the cabinet fits either. They differ electrically and slightly in excursion, 17.6 mm one way on the D2 against 19 mm on the D4, but nothing about the enclosure changes.

Why 0.60 cubic feet net per driver?

That is Audiofrog's own recommended sealed volume for the GB10, 17 liters in their documentation, and theirs is a net figure exactly as ours is. It gives a system Qtc of 0.823 to 0.848, a moderately damped alignment rather than a textbook 0.707, which is the voicing Audiofrog designed the box recommendation around. Each chamber is 0.73 cu ft gross before the driver's 0.111 cu ft of basket displacement.

What amplifier power should I run, and what impedance?

The Audiofrog GB10 is rated 500 watts RMS each, so 1000 across the pair. The GB series does not bring its coils out to the terminals. Each driver carries an impedance selection switch, and the terminal cup wires the two positions in parallel, so the switch alone decides what the amplifier sees. Set both drivers to the HIGH position. A pair of D2 drivers at 4 ohms each presents 2 ohms; a pair of D4 drivers at 8 ohms each presents 4 ohms. Leaving both in the low position halves that again, to 0.5 ohms on a D2 pair, which almost no amplifier is stable into. Set both switches the same way and set them before you mount the drivers, because the switch faces the motor. Aim for roughly 700 to 1000 watts at whichever impedance you select.

How is this different from the wedge version?

Acoustically it is not. This cabinet holds the same 0.60 cubic feet per driver as our wedge version of the same pair, so the two publish the same Qtc and the same F3. They are the same enclosure in two shapes. Pick the one that fits where the cabinet has to live. The wedge tucks against a rear seat back and fires into the trunk; this one sits flat on the floor with the cones firing down, keeps a rectangular footprint you can stack against, and can be run front firing instead by leaving the feet off.

What are the feet for, and do I have to use them?

Feet ship with the cabinet, uninstalled on purpose. Mount them where your floor wants them for a down fire install, or leave them off and run it front firing. The orientation is yours to choose. The 1.75 inch standoff they give is what the floor clearance figures on this page assume.

What is the expected low-frequency extension?

Half power lands at 44.4 to 46.3 Hz anechoic, before any cabin gain. Qtc is 0.823 to 0.848. Firing into the floor tends to help in practice, because the sealed rolloff meets rising cabin gain below 60 Hz, but the published figure is the anechoic one. Audiofrog rates the GB10 itself down to 24 Hz.

Do I need to add polyfill or damping?

No. Polyfill is already installed in each chamber as a light wall lining and the quantity is chosen so it does not change the acoustic volume. Do not add more.

Are the drivers included?

No. This is an enclosure only. You receive the cabinet finished in plush black carpet, with threaded inserts at both driver positions, stainless machine screws, one side-mounted pre-wired terminal cup, the feet uninstalled and the polyfill lining already in place.

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