Performance Optimized Wedge Sealed Dual 12" Enclosure Image Dynamics IDQ 12 · Dual 12" Sealed enclosure

Yes. Both positions are CNC cut to 10.937 in, which clears the 276 mm (10.866 in) cutout on Image Dynamics' IDQ12 template, the recess takes the 12.48 in frame, and the raked rear panel clears the 5.77 in motor with 5.01 in to spare. The D2 and D4 share the frame, cutout and depth, so either fits.

Run a matched pair, both D2 or both D4, so the chambers behave the same and the wiring works out to a usable load.

The IDQ12 V4 is a high-Qts driver, 0.68 on the D2 and 0.74 on the D4. A maximally flat 0.707 box would take about 21 cubic feet for the D2, and the D4 cannot reach 0.707 in any sealed volume, so every box a trunk can hold puts it near Qtc 1.0; that is the driver, not the cabinet.

At 1.25 cubic feet per chamber the D2 sits at Qtc 1.048 and the D4 at 1.130, with a 1.5 to 2.0 dB rise centred near 70 Hz. The volume matches our dual IDMAX12 wedge and keeps the cabinet to 17.10 inches deep at the base; the single IDQ 12 wedge holds 1.40, which in a dual would have pushed the base past 18 inches.

The IDQ12 V4 is rated 375 watts RMS each, so 750 across the pair; target 262 to 375 watts per driver at the final load.

A pair of D2 wires to 2 ohms (each driver in series, the pair in parallel) or 8 ohms; paralleling everything gives 0.5 ohm, which almost no amplifier runs. A pair of D4 wires to 1 ohm, which needs an amplifier rated 1 ohm stable, or 4 ohms, the safe answer on any amplifier. Confirm your amplifier's minimum stable impedance first.

The seat-side face carries a 20 degree rake that matches the lean of a factory rear seat back, so the cabinet sits flush against it and the cargo space in front stays usable. The baffle is the vertical trunk-lid-side face, so both drivers fire rearward into the trunk cavity.

The trunk acts as an acoustic extension for the sealed box, and the cabin adds real output below 50 Hz, so in-vehicle response runs deeper than the anechoic figures on this page.

Two drivers sharing one sealed volume load each other: each driver's compression stroke becomes the pressure the other works against, which blurs the alignment either would have alone. A bonded full-height 3/4 inch divider gives each driver its own 1.25 cubic feet and its own polyfill.

It also means a failure in one driver does not unload the other, and the alignment on this page is the alignment in each chamber, not an average across a shared box.

Half power lands at 40.4 Hz on the D2 and 40.1 Hz on the D4, anechoic and per chamber, with system resonance at 52.4 and 53.5 Hz. At Qtc 1.05 to 1.13 the response rises 1.5 to 2.0 dB near 70 Hz before rolling off, so half power sits below resonance.

Those figures exclude cabin gain. In a car the cabin's transfer function adds real output below 50 Hz, so in-vehicle response runs deeper than the numbers above.

No. Polyfill is already installed in both chambers as a light wall lining to control internal reflections, and the quantity is chosen so it does not change the acoustic volume.

Do not add more. Packing a sealed box with fill makes it behave as though it were larger, which walks the alignment away from the 1.25 cubic feet per chamber this cabinet was built to.

No. This is an enclosure only. You receive the cabinet finished in plush black carpet with the gloss black acrylic baffle insert, one side-mounted pre-wired terminal cup to both positions, the polyfill lining in place, and threaded inserts pre-installed on Image Dynamics' 11.85 in bolt circle with stainless machine screws.

Bring your own matched pair of IDQ12 V4, D2 or D4. The cabinet is cut direct fit to that driver, not a general purpose dual 12 box.