Morel Primo 124 (SVC 4 ohm)

12″ subwoofer · 4 Ω · 300 W RMS

Fs 32 HzQts 0.52Vas 2.12 ft³Xmax 0.31″

Recommended box

For a sedan, one sub, 300 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 volume1.52 ft³ (43 L)
Qtc0.81
Fc50 Hz
F3 (−3 dB, no cabin gain)46 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 7 15/16″
Open sealed box in designer

Ported

Net volume2.61 ft³ (74 L)
Tuning (Fb)34 Hz
Portslot 1 9/16 × 14 5/16″, 16 1/16″ long
Port velocity at 300 W61 ft/s
F3 (−3 dB, no cabin gain)31 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 13 7/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs32 Hz
Qts0.52
Qes0.61
Qms3.64
Vas2.12 ft³
Re3.2 Ω
Sd67.3 in²
Xmax0.31″
Vd21.2 in³ calc.
Mms110 g calc.
BL10.8 T·m calc.
EBP52 — sealed or ported calc.
Sensitivity, 1 W / 1 m87.1 dB calc.

General

Size12″
Voice coils4 Ω
RMS power300 W

Mounting dimensions

Ø12″cutout Ø10 5/8″mounting depth 5 1/2″magnet Ø≈ 6 15/16″
Cutout diameter10 5/8″
Mounting depth5 1/2″
Overall diameter12″

“≈” 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 Morel 12″ models