RE Audio REX12 S4

12″ subwoofer · 4 Ω · 200 W RMS

Fs 23.9 HzQts 0.62Vas 3.44 ft³

Recommended box

For a sedan, one sub, 200 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 volume1.94 ft³ (55 L)
Qtc1.03
Fc40 Hz
F3 (−3 dB, no cabin gain)32 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 5/8″
Open sealed box in designer

Ported

Net volume3.32 ft³ (94 L)
Tuning (Fb)30 Hz
Portslot 1 9/16 × 14 5/16″, 16 1/4″ long
Port velocity at 200 W50 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 16 1/4″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs23.9 Hz
Qts0.62
Qes0.697
Qms5.56
Vas3.44 ft³
Re3.61 Ω
Sd85.5 in²
Xmax≈ 0.39″
Mms196 g calc.
BL12.4 T·m calc.
EBP34 — suits sealed calc.
Sensitivity, 1 W / 1 m84.8 dB calc.

General

Size12″
Voice coils4 Ω
RMS power200 W

Mounting dimensions

Ø12 13/16″cutout Ø11″mounting depth 5 1/2″magnet Ø≈ 7 1/8″
Cutout diameter11″
Mounting depth5 1/2″
Overall diameter12 13/16″

“≈” 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 RE Audio 12″ models