Performance Optimized Wedge Sealed 15" Enclosure DD Audio 9915c · Single 15" Sealed enclosure

Yes. DD sells the 9915c in D1 and D2 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 15.190 in and the mounting depth allowance is 10.810 in.

1.40 cubic feet net, the Butterworth volume for this driver computed from DD's published Fs, Qts and Vas. In it the 9915c lands at Qtc 0.616, well damped, on the dry side of flat, with system resonance at 52.8 Hz. The box is 1.82 cu ft gross before the driver's displacement of 0.400 cu ft, which is DD's own figure.

DD rate the 9915c at 3200 watts RMS. DD sells the 9915c in D1 and D2. the D1 is two 1 ohm coils, 2 ohms in series or 0.5 ohm in parallel; the D2 is two 2 ohm coils, 4 ohms in series or 1 ohm 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 2240 to 3200 watts at the impedance you wire.

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.

DD publishes no Sd for any of its drivers. The 1028.9 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.

Half power lands at 61.8 Hz anechoic, before any cabin gain. Qtc is 0.616. These figures exclude cabin gain, which in most vehicles adds real output below 40 Hz. DD publish the 9915c's free-air resonance at 34.32 Hz.

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.

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.