Prology PS-8 Poseidon

8″ subwoofer · dual 4 Ω · 150 W RMS

Fs 53.3 HzQts 0.63Vas 0.33 ft³

Recommended box

For a sedan, one sub, 150 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 volume0.57 ft³ (16 L)
Qtc0.80
Fc67 Hz
F3 (−3 dB, no cabin gain)62 Hz
Example box (outside)10 1/4″ × 10 1/4″ × 14 3/4″
Open sealed box in designer

Ported

Net volume1.24 ft³ (35 L)
Tuning (Fb)38 Hz
Portslot 1 9/16 × 14 5/16″, 29 7/8″ long
Port velocity at 150 W36 ft/s
F3 (−3 dB, no cabin gain)33 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 8 11/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs53.3 Hz
Qts0.63
Qes0.78
Qms3.4
Vas0.33 ft³
Re (one coil)3.1 Ω
Sd31.9 in²
Xmax≈ 0.39″
Mms58 g calc.
BL8.8 T·m calc.
EBP68 — sealed or ported calc.
Sensitivity, 1 W / 1 m84.6 dB calc.

General

Size8″
Voice coilsdual 4 Ω
RMS power150 W

Mounting dimensions

Ø≈ 8 1/4″cutout Ø7 1/16″mounting depth 3 15/16″magnet Ø≈ 4 5/8″
Cutout diameter7 1/16″
Mounting depth3 15/16″

“≈” 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 Prology 8″ models