Rockville W12K9D4

12″ subwoofer · dual 4 Ω · 1,000 W RMS

Fs 31.7 HzQts 0.49Vas 1.37 ft³Xmax 1.10″

Recommended box

For a sedan, one sub, 1,000 W. It’s the same math as the designer’s step-by-step mode, where you can fit the box to your space, vehicle and amp and get plans, a cut sheet and DXF.

Sealed

Net volume0.85 ft³ (24 L)
Qtc0.80
Fc51 Hz
F3 (−3 dB, no cabin gain)49 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 11 9/16″
Open sealed box in designer

Ported

Net volume2.68 ft³ (76 L)
Tuning (Fb)28 Hz
Portslot 2 15/16 × 14 5/16″, 48 3/8″ long
Port velocity at 1,000 W62 ft/s
F3 (−3 dB, no cabin gain)25 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 18 1/4″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs31.7 Hz
Qts0.49
Qes0.54
Qms5.59
Vas1.37 ft³
Re (one coil)4 Ω
Sd84.4 in²
Xmax1.10″
Vd93 in³ calc.
Mms272 g calc.
BL20 T·m calc.
EBP59 — sealed or ported calc.
Sensitivity, 1 W / 1 m85.6 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power1,000 W

Mounting dimensions

Ø≈ 12 5/16″cutout Ø11 1/8″mounting depth 6 7/8″magnet Ø7 1/2″
Cutout diameter11 1/8″
Mounting depth6 7/8″
Magnet diameter7 1/2″

Cone area (Sd) calculated from Fs, Vas and Mms: 84.3 in².

“≈” means the value isn’t in the spec sheet and a typical value for the size is used; “calc.” means it’s calculated from the published parameters. Check the manufacturer’s spec sheet before you build.

Data sources

Other Rockville 12″ models