Gladen RS 12 FA Free-Air (SVC 4 ohm)

12″ subwoofer · 4 Ω · 400 W RMS

Fs 28.1 HzQts 0.53Vas 3.26 ft³

Recommended box

For a sedan, one sub, 400 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 volume1.73 ft³ (49 L)
Qtc0.89
Fc48 Hz
F3 (−3 dB, no cabin gain)42 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 8 3/4″
Open sealed box in designer

Ported

Net volume2.93 ft³ (83 L)
Tuning (Fb)34 Hz
Portslot 1 3/4 × 14 5/16″, 15 7/8″ long
Port velocity at 400 W65 ft/s
F3 (−3 dB, no cabin gain)31 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 14 13/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs28.1 Hz
Qts0.53
Qes0.58
Qms5.79
Vas3.26 ft³
Re3.9 Ω
Sd76 in²
Xmax≈ 0.39″
Mms118 g calc.
BL11.9 T·m calc.
EBP48 — suits sealed calc.
Sensitivity, 1 W / 1 m87.5 dB calc.

General

Size12″
Voice coils4 Ω
RMS power400 W

Mounting dimensions

Ø12 1/2″cutout Ø11 1/8″mounting depth 5 1/4″magnet Ø≈ 7 3/16″
Cutout diameter11 1/8″
Mounting depth5 1/4″
Overall diameter12 1/2″

“≈” 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 Gladen 12″ models