Rockville W12T4S4

12″ subwoofer · 4 Ω · 350 W RMS

Fs 37.7 HzQts 0.70Vas 1.71 ft³

Recommended box

For a sedan, one sub, 350 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 volume1.94 ft³ (55 L)
Qtc0.96
Fc52 Hz
F3 (−3 dB, no cabin gain)43 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 5/8″
Open sealed box in designer

Ported

Net volume3.28 ft³ (93 L)
Tuning (Fb)36 Hz
Portslot 1 15/16 × 14 5/16″, 13 5/16″ long
Port velocity at 350 W64 ft/s
F3 (−3 dB, no cabin gain)31 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 16 1/8″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs37.7 Hz
Qts0.70
Qes0.76
Qms9
Vas1.71 ft³
Re3.33 Ω
Sd85.1 in²
Xmax≈ 0.39″
Mms157 g calc.
BL12.8 T·m calc.
EBP50 — suits sealed calc.
Sensitivity, 1 W / 1 m87.3 dB calc.

General

Size12″
Voice coils4 Ω
RMS power350 W

Mounting dimensions

Ø12 1/2″cutout Ø11″mounting depth 3 11/16″magnet Ø≈ 7 1/8″
Cutout diameter11″
Mounting depth3 11/16″
Overall diameter12 1/2″

Cone area (Sd) calculated from Fs, Vas and Mms: 85.1 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