Pioneer TS-W311S4

12″ subwoofer · 4 Ω · 400 W RMS

42 HzFs, resonance
0.80Qts
1.32 ft³Vas
0.31″Xmax
400 WRMS

Recommended box

For a sedan, one sub, 400 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

smaller, tighter
1.94 ft³ (55 L)
Net volume
Qtc1.03
Fc54 Hz
F3 (−3 dB, no cabin gain)44 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 5/8″
Open sealed box in designer

Ported

deeper, louder
3.28 ft³ (93 L)
Net volume
Tuning (Fb)37 Hz
Portslot 2 3/8 × 14 5/16″, 15 5/16″ long
Port velocity at 400 W60 ft/s
F3 (−3 dB, no cabin gain)31 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 16 7/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs42 Hz
Qts0.80
Qes0.84
Qms14.96
Vas1.32 ft³
Re3 Ω
Sd85.2 in²
Xmax0.31″
Vd26.8 in³ calc.
Mms164 g calc.
BL12.4 T·m calc.
EBP50 — sealed or ported calc.
Sensitivity, 1 W / 1 m87.2 dB calc.

General

Size12″
Voice coils4 Ω
RMS power400 W

Mounting dimensions

Ø12 7/8″cutout Ø11 1/8″mounting depth 5 15/16″magnet Ø≈ 7 1/4″
Cutout diameter11 1/8″
Mounting depth5 15/16″
Overall diameter12 7/8″

Cone area (Sd) calculated from Fs, Vas and Mms: 85.2 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 Pioneer 12″ models