ESX QX-1222 (2x2 Ohm)

12″ subwoofer · dual 2 Ω · 2,500 W RMS

Fs 31 HzQts 0.47Vas 1.09 ft³Xmax 0.98″

Recommended box

For a sedan, one sub, 2,500 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 volume0.76 ft³ (21.5 L)
Qtc0.74
Fc48 Hz
F3 (−3 dB, no cabin gain)49 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 10 5/8″
Open sealed box in designer

Ported

Net volume1.91 ft³ (54 L)
Tuning (Fb)29 Hz
Portslot 2 3/16 × 14 5/16″, 47 1/8″ long
Port velocity at 2,500 W116 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 13 13/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs31 Hz
Qts0.47
Qes0.5
Qms9
Vas1.09 ft³
Re (one coil)1.8 Ω
Sd77.3 in²
Xmax0.98″
Vd76.1 in³ calc.
Mms300 g calc.
BL14.5 T·m calc.
EBP62 — sealed or ported calc.
Sensitivity, 1 W / 1 m84.7 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power2,500 W

Mounting dimensions

Ø12 9/16″cutout Ø11 1/8″mounting depth 8 3/16″magnet Ø≈ 7 3/16″
Cutout diameter11 1/8″
Mounting depth8 3/16″
Overall diameter12 9/16″

“≈” 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 ESX 12″ models