ESX SX1224 (2x4 Ohm)

12″ subwoofer · dual 4 Ω · 750 W RMS

Fs 30 HzQts 0.47Vas 1.31 ft³Xmax 0.79″

Recommended box

For a sedan, one sub, 750 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 volume0.71 ft³ (20 L)
Qtc0.79
Fc51 Hz
F3 (−3 dB, no cabin gain)48 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 10 1/16″
Open sealed box in designer

Ported

Net volume2.26 ft³ (64 L)
Tuning (Fb)28 Hz
Portslot 2 3/8 × 14 5/16″, 46 1/4″ long
Port velocity at 750 W62 ft/s
F3 (−3 dB, no cabin gain)25 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 15 7/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs30 Hz
Qts0.47
Qes0.51
Qms6
Vas1.31 ft³
Re (one coil)3 Ω
Sd77.3 in²
Xmax0.79″
Vd60.9 in³ calc.
Mms268 g calc.
BL17.2 T·m calc.
EBP59 — sealed or ported calc.
Sensitivity, 1 W / 1 m84.9 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power750 W

Mounting dimensions

Ø≈ 12 3/16″cutout Ø11″mounting depth 6 5/8″magnet Ø≈ 7 3/16″
Cutout diameter11″
Mounting depth6 5/8″

“≈” 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 ESX 12″ models