Prology PS-12 Poseidon

12″ subwoofer · dual 4 Ω · 350 W RMS

Fs 38.9 HzQts 0.59Vas 1.94 ft³

Recommended box

For a sedan, one sub, 350 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)
Qtc0.86
Fc57 Hz
F3 (−3 dB, no cabin gain)51 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)38 Hz
Portslot 1 3/4 × 14 5/16″, 11 7/8″ long
Port velocity at 350 W65 ft/s
F3 (−3 dB, no cabin gain)34 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 14 1/2″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs38.9 Hz
Qts0.59
Qes0.73
Qms3.05
Vas1.94 ft³
Re (one coil)3.2 Ω
Sd76 in²
Xmax≈ 0.39″
Mms104 g calc.
BL10.5 T·m calc.
EBP53 — sealed or ported calc.
Sensitivity, 1 W / 1 m88.5 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power350 W

Mounting dimensions

Ø≈ 12″cutout Ø10 13/16″mounting depth 5 1/2″magnet Ø≈ 7 1/16″
Cutout diameter10 13/16″
Mounting depth5 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 Prology 12″ models