Pride ST 18 D0.5

18″ subwoofer · dual 0.5 Ω · 5,000 W RMS

Fs 22.1 HzQts 0.24Vas 6.53 ft³Xmax 1.48″

Recommended box

For a sedan, one sub, 5,000 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 volume2.33 ft³ (66 L)
Qtc0.47
Fc43 Hz
F3 (−3 dB, no cabin gain)75 Hz
Example box (outside)20 1/16″ × 20 1/16″ × 14 3/8″
Open sealed box in designer

Ported

Net volume3.92 ft³ (111 L)
Tuning (Fb)27 Hz
Portslot 3 3/4 × 19 7/16″, 61″ long
Port velocity at 5,000 W92 ft/s
F3 (−3 dB, no cabin gain)29 Hz
Example box (outside)31 1/2″ × 20 7/8″ × 22 9/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs22.1 Hz
Qts0.24
Qes0.253
Qms4.79
Vas6.53 ft³
Re (one coil)0.45 Ω
Sd204.6 in²
Xmax1.48″
Vd302.1 in³ calc.
Mms692 g calc.
BL13.1 T·m calc.
EBP87 — sealed or ported calc.
Sensitivity, 1 W / 1 m91 dB calc.

General

Size18″
Voice coilsdual 0.5 Ω
RMS power5,000 W

Mounting dimensions

Ø≈ 18 1/8″cutout Ø16 15/16″mounting depth 11 15/16″magnet Ø≈ 11″
Cutout diameter16 15/16″
Mounting depth11 15/16″

Qes and Qms are not on the spec sheet — calculated from Qts, motor strength BL and Re.

Judging by its value, the published Re is for both coils in series — converted to per coil.

“≈” 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 Pride 18″ models