Pioneer TS-W311D4

12″ subwoofer · dual 4 Ω · 400 W RMS

Fs 43 HzQts 0.95Vas 1.15 ft³Xmax 0.43″
The published specs don’t add up:

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

Net volume1.84 ft³ (52 L)
Qtc1.21
Fc55 Hz
F3 (−3 dB, no cabin gain)41 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 3/16″
Open sealed box in designer

Ported

Net volume3.11 ft³ (88 L)
Tuning (Fb)38 Hz
Portslot 2 3/16 × 14 5/16″, 13 7/8″ long
Port velocity at 400 W66 ft/s
F3 (−3 dB, no cabin gain)31 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 15 1/2″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs43 Hz
Qts0.95
Qes1.02
Qms13.79
Vas1.15 ft³
Re (one coil)2.9 Ω
Sd80.6 in²
Xmax0.43″
Vd34.3 in³ calc.
Mms160 g calc.
BL11.1 T·m calc.
EBP42 — suits sealed calc.
Sensitivity, 1 W / 1 m86.1 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power400 W

Mounting dimensions

Ø≈ 12 5/16″cutout Ø11 1/8″mounting depth 5 15/16″magnet Ø≈ 7 1/4″
Cutout diameter11 1/8″
Mounting depth5 15/16″

“≈” 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