ESX QXP124 (4 Ohm)

12″ subwoofer · 4 Ω · 500 W RMS

Fs 26 HzQts 0.55Vas 1.84 ft³Xmax 0.57″

Recommended box

For a sedan, one sub, 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 volume1.66 ft³ (47 L)
Qtc0.80
Fc38 Hz
F3 (−3 dB, no cabin gain)36 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 8 1/2″
Open sealed box in designer

Ported

Net volume3.32 ft³ (94 L)
Tuning (Fb)25 Hz
Portslot 2 3/16 × 14 5/16″, 35 3/8″ long
Port velocity at 500 W61 ft/s
F3 (−3 dB, no cabin gain)22 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 18 3/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs26 Hz
Qts0.55
Qes0.59
Qms8.26
Vas1.84 ft³
Re3.3 Ω
Sd85.5 in²
Xmax0.57″
Vd48.8 in³ calc.
Mms309 g calc.
BL16.8 T·m calc.
EBP44 — suits sealed calc.
Sensitivity, 1 W / 1 m83.9 dB calc.

General

Size12″
Voice coils4 Ω
RMS power500 W

Mounting dimensions

Ø12 13/16″cutout Ø11 1/4″mounting depth 3 1/2″magnet Ø6 1/8″
Cutout diameter11 1/4″
Mounting depth3 1/2″
Overall diameter12 13/16″
Magnet diameter6 1/8″

“≈” 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