Proline X PO 8-S W 608F sealed wedge, front baffle with gloss black insert and pre-wired leads, 10.80 by 11.75 inches.
Proline X PO 8-S W 608F sealed wedge, side profile with recessed terminal cup, 12.87 inch base, 11.75 inches tall.

Performance Optimized · Datasheet

Performance Optimized Wedge Sealed 8" Enclosure DD Audio 608f · Single 8" Sealed enclosure

Net volume
0.30 cu ft
Max mounting depth
7.000 in available, 6.500 in required
Cutout
7.370 in
External dimensions
10.80 in W × 11.75 in at the seat face H × 12.87 in at the base D
Front baffle
1.5 in, double baffle
Buy at Audio IntensityFactory-direct, ships from Tullahoma
  • Best For: DD Audio 608f Trunk-Fit Builds
  • Net Volume: 0.30 cu ft (0.38 cu ft Gross)
  • Alignment: Qtc 0.629, fc 52.0 Hz, F3 59.2 Hz
  • Driver Match: DD Audio 608f (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 608f, 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 Width10.80 in
External Height11.75 in at the seat face
External Depth12.87 in at the base, tapering to 8.59 in at the top
Internal Volume, Gross0.38 cu ft
Internal Volume, Net Acoustic0.30 cu ft
AlignmentQtc 0.629, fc 52.0 Hz, F3 59.2 Hz anechoic
Driver Cutout7.370 in
Driver Mounting Depth7.000 in available, 6.500 in required
Frame Outer Diameter8.300 in, as published by DD Audio
Driver Displacement0.070 cu ft, as published by DD Audio
Cone Area (derived)214.1 cm2, from DD's published piston diameter; DD publish no Sd
Power Handling1000 watts RMS
ImpedanceD2: 4 ohms in series or 1 ohm in parallel; D4: 8 ohms in series or 2 ohms in parallel
Xmax18 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 lb
Warranty1 Year Limited
Built InTullahoma, Tennessee

From the shop floor

Installer's take

0.30 cubic feet net, the Butterworth volume for this driver computed from DD's published Fs, Qts and Vas. In it the 608f lands at Qtc 0.629, well damped, on the dry side of flat, with system resonance at 52.0 Hz. Half power lands at 59.2 Hz anechoic, before any cabin gain.

DD publishes no Sd for any of its drivers. The 214.1 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 608f 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 12.87 inches deep at the trunk floor, 8.59 at the top, and 10.80 wide. It is deeper at the base than it is tall, because the 608f carries a 6.500 in motor and the cabinet has to clear it.

Before you order

Questions

Will this enclosure fit both coil versions of the 608f?

Yes. DD sells the 608f 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 7.370 in and the mounting depth allowance is 7.000 in.

Why 0.30 cubic feet net?

0.30 cubic feet net, the Butterworth volume for this driver computed from DD's published Fs, Qts and Vas. In it the 608f lands at Qtc 0.629, well damped, on the dry side of flat, with system resonance at 52.0 Hz. The box is 0.38 cu ft gross before the driver's displacement of 0.070 cu ft, which is DD's own figure.

What amplifier power should I run, and what impedance?

DD rate the 608f at 1000 watts RMS. DD sells the 608f 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 700 to 1000 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 214.1 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 59.2 Hz anechoic, before any cabin gain. Qtc is 0.629. These figures exclude cabin gain, which in most vehicles adds real output below 40 Hz. DD publish the 608f's free-air resonance at 38.00 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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