Alpine SWA-10S4 (Atom)

10″ subwoofer · 4 Ω · 250 W RMS

Fs 32 HzQts 0.42Vas 1.45 ft³Xmax 0.39″

Recommended box

For a sedan, one sub, 250 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 volume0.53 ft³ (15 L)
Qtc0.81
Fc62 Hz
F3 (−3 dB, no cabin gain)58 Hz
Example box (outside)12 3/16″ × 12 3/16″ × 10 1/4″
Open sealed box in designer

Ported

Net volume1.80 ft³ (51 L)
Tuning (Fb)32 Hz
Portslot 1 9/16 × 14 5/16″, 28 13/16″ long
Port velocity at 250 W48 ft/s
F3 (−3 dB, no cabin gain)30 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 11″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs32 Hz
Qts0.42
Qes0.45
Qms6.04
Vas1.45 ft³
Re3.6 Ω
Sd51.2 in²
Xmax0.39″
Vd20.1 in³ calc.
Mms93 g calc.
BL12.2 T·m calc.
EBP71 — sealed or ported calc.
Sensitivity, 1 W / 1 m86.8 dB calc.

General

Size10″
Voice coils4 Ω
RMS power250 W

Mounting dimensions

Ø10 11/16″cutout Ø9″mounting depth 5 1/4″magnet Ø≈ 5 13/16″
Cutout diameter9″
Mounting depth5 1/4″
Overall diameter10 11/16″

“≈” 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 Alpine 10″ models