Dayton Audio SS18-22

18″ subwoofer · dual 2 Ω · 1,300 W RMS

Fs 21 HzQts 0.37Vas 7.91 ft³Xmax 1.02″

Recommended box

For a sedan, one sub, 1,300 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 volume2.22 ft³ (63 L)
Qtc0.80
Fc45 Hz
F3 (−3 dB, no cabin gain)43 Hz
Example box (outside)20 1/16″ × 20 1/16″ × 13 7/8″
Open sealed box in designer

Ported

Net volume7.03 ft³ (199 L)
Tuning (Fb)25 Hz
Portslot 3 3/8 × 19 7/16″, 32 15/16″ long
Port velocity at 1,300 W65 ft/s
F3 (−3 dB, no cabin gain)24 Hz
Example box (outside)31 1/2″ × 20 7/8″ × 27 1/4″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs21 Hz
Qts0.37
Qes0.42
Qms3.4
Vas7.91 ft³
Re (one coil)1.35 Ω
Sd184.1 in²
Xmax1.02″
Vd188.5 in³ calc.
Mms513 g calc.
BL14.7 T·m calc.
EBP50 — sealed or ported calc.
Sensitivity, 1 W / 1 m88.9 dB calc.

General

Size18″
Voice coilsdual 2 Ω
RMS power1,300 W

Mounting dimensions

Ø18 1/2″cutout Ø16 13/16″mounting depth 10 1/4″magnet Ø≈ 10 15/16″
Cutout diameter16 13/16″
Mounting depth10 1/4″
Overall diameter18 1/2″

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 Dayton Audio 18″ models