Proline X PO 8-S W 2508GESP sealed wedge, front baffle with gloss black insert and pre-wired leads, 11.45 by 11.75 inches.
Proline X PO 8-S W 2508GESP sealed wedge, side profile with recessed terminal cup, 13.06 inch base, 11.75 inches tall.

Performance Optimized · Datasheet

Performance Optimized Wedge Sealed 8" Enclosure DD Audio 2508g ESP · Single 8" Sealed enclosure

Net volume
0.33 cu ft
Max mounting depth
7.190 in available, 6.690 in required
Cutout
8.000 in
External dimensions
11.45 in W × 11.75 in at the seat face H × 13.06 in at the base D
Front baffle
1.5 in, double baffle
Buy at Audio IntensityFactory-direct, ships from Tullahoma
  • Best For: DD Audio 2508g ESP Trunk-Fit Builds
  • Net Volume: 0.33 cu ft (0.42 cu ft Gross)
  • Alignment: Qtc 0.685, fc 51.4 Hz, F3 53.1 Hz
  • Driver Match: DD Audio 2508g ESP (D2 or D4)
  • Construction: Rear-Firing Wedge | V-Groove/Dado | Double 1.5" Baffle | Threaded Insert Kit included

Spec of record

Technical specifications

SpecificationValue
SeriesProline X Performance Optimized Wedge
Compatible DriverDD Audio 2508g ESP, D2 or D4, quantity 1. Direct fit
ConfigurationSingle 8 inch, single 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 Width11.45 in
External Height11.75 in at the seat face
External Depth13.06 in at the base, tapering to 8.78 in at the top
Internal Volume, Gross0.42 cu ft
Internal Volume, Net Acoustic0.33 cu ft
AlignmentQtc 0.685, fc 51.4 Hz, F3 53.1 Hz anechoic
Driver Cutout8.000 in
Driver Mounting Depth7.190 in available, 6.690 in required
Frame Outer Diameter8.950 in, as published by DD Audio
Driver Displacement0.080 cu ft, as published by DD Audio
Cone Area (derived)266.3 cm2, from DD's published piston diameter; DD publish no Sd
Power Handling1200 watts RMS
ImpedanceD2: 4 ohms in series or 1 ohm in parallel; D4: 8 ohms in series or 2 ohms in parallel
Xmax20 mm one way
MaterialLangboard Elite MDF
ConstructionCNC cut, V-groove and dado joinery
Panel Thickness0.75 in
Front Baffle1.5 in, double baffle
Internal BracingInternal brace
Driver MountingThreaded insert kit included, NOT pre-installed: DD publish no mounting hole locations
Terminal CupsOne Proline X ABS and carbon fiber composite, side mounted, pre wired 12 gauge OFC
DampingLight polyfill wall lining, does not alter acoustic volume
CarpetPlush black
Weight14.5 lb
Warranty1 Year Limited
Built InTullahoma, Tennessee

From the shop floor

Installer's take

0.33 cubic feet net, the Butterworth volume for this driver computed from DD's published Fs, Qts and Vas. In it the 2508g ESP lands at Qtc 0.685, maximally flat, the reference musical alignment, with system resonance at 51.4 Hz. Half power lands at 53.1 Hz anechoic, before any cabin gain.

DD publishes no Sd for any of its drivers. The 266.3 square centimetre figure behind this alignment is derived from DD's own published piston diameter, which they define as measured halfway across the surround, the convention Sd itself is defined from. DD publishes no Mms, Cms or DC resistance either.

DD publishes no mounting hole locations, so the inserts are not in the baffle when the box arrives. The insert kit is in the box: set them where the woofer's own holes fall, with the drill bit and screws in the kit, and lay the gasket tape before the woofer goes down.

DD sells the 2508g ESP in D2 and D4. the D2 is two 2 ohm coils, 4 ohms in series or 1 ohm in parallel; the D4 is two 4 ohm coils, 8 ohms in series or 2 ohms in parallel. DD publishes one set of Thiele-Small parameters for the model rather than a set per coil, so this cabinet is the same either way. A parallel load at or under 1 ohm needs an amplifier rated for it.

Measure the base depth. This cabinet is 13.06 inches deep at the trunk floor, 8.78 at the top, and 11.45 wide. It is deeper at the base than it is tall, because the 2508g ESP carries a 6.690 in motor and the cabinet has to clear it.

Before you order

Questions

Will this enclosure fit both coil versions of the 2508g ESP?

Yes. DD sells the 2508g ESP in D2 and D4 and publishes one set of Thiele-Small parameters for the model rather than a set per coil, so the cabinet is the same either way. The cutout is 8.000 in and the mounting depth allowance is 7.190 in.

Why 0.33 cubic feet net?

0.33 cubic feet net, the Butterworth volume for this driver computed from DD's published Fs, Qts and Vas. In it the 2508g ESP lands at Qtc 0.685, maximally flat, the reference musical alignment, with system resonance at 51.4 Hz. The box is 0.42 cu ft gross before the driver's displacement of 0.080 cu ft, which is DD's own figure.

What amplifier power should I run, and what impedance?

DD rate the 2508g ESP at 1200 watts RMS. DD sells the 2508g ESP in D2 and D4. the D2 is two 2 ohm coils, 4 ohms in series or 1 ohm in parallel; the D4 is two 4 ohm coils, 8 ohms in series or 2 ohms in parallel. DD publishes one set of Thiele-Small parameters for the model rather than a set per coil, so this cabinet is the same either way. A parallel load at or under 1 ohm needs an amplifier rated for it. Aim for roughly 840 to 1200 watts at the impedance you wire.

How does a wedge enclosure improve the sound in a trunk installation?

The angled seat-side face matches the roughly 20 degree lean of a factory rear seat, so the cabinet sits flat against it instead of leaving a wasted triangle. The vertical trunk-lid-side face carries the driver, firing rearward into the trunk cavity.

Where does the cone area figure come from?

DD publishes no Sd for any of its drivers. The 266.3 square centimetre figure behind this alignment is derived from DD's own published piston diameter, which they define as measured halfway across the surround, the convention Sd itself is defined from. DD publishes no Mms, Cms or DC resistance either.

What is the expected low-frequency extension?

Half power lands at 53.1 Hz anechoic, before any cabin gain. Qtc is 0.685. These figures exclude cabin gain, which in most vehicles adds real output below 40 Hz. DD publish the 2508g ESP's free-air resonance at 42.00 Hz.

Do I need to add polyfill or damping?

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

Is the driver included, and are the threaded inserts installed?

No driver: this is an enclosure only. You receive the cabinet finished in plush black carpet, one side-mounted pre-wired terminal cup and the polyfill lining installed. DD Audio publishes no mounting hole locations for this driver, so the threaded inserts are not pressed before it ships. The threaded insert kit comes in the box instead: inserts sized to the woofer, the correct drill bit, allen-head screws, an allen key and woofer gasket tape. You set them when the woofer goes in.

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