JBL Stage 1210

12″ subwoofer · 4 Ω · 250 W RMS

Fs 31.7 HzQts 0.55Vas 2.28 ft³Xmax 0.45″

Recommended box

For a sedan, one sub, 250 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 volume1.87 ft³ (53 L)
Qtc0.82
Fc47 Hz
F3 (−3 dB, no cabin gain)44 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 3/8″
Open sealed box in designer

Ported

Net volume3.18 ft³ (90 L)
Tuning (Fb)32 Hz
Portslot 1 9/16 × 14 5/16″, 14 5/8″ long
Port velocity at 250 W61 ft/s
F3 (−3 dB, no cabin gain)29 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 15 9/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs31.7 Hz
Qts0.55
Qes0.6
Qms6.64
Vas2.28 ft³
Re3.6 Ω
Sd82.3 in²
Xmax0.45″
Vd36.9 in³ calc.
Mms156 g calc.
BL13.6 T·m calc.
EBP53 — sealed or ported calc.
Sensitivity, 1 W / 1 m87.4 dB calc.

General

Size12″
Voice coils4 Ω
RMS power250 W

Mounting dimensions

Ø12 3/16″cutout Ø11″mounting depth 6 7/16″magnet Ø≈ 7 3/16″
Cutout diameter11″
Mounting depth6 7/16″
Overall diameter12 3/16″

“≈” 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 JBL 12″ models