Swat HLG-P12D2

12″ subwoofer · dual 2 Ω · 3,500 W RMS

Fs 31 HzQts 0.49Vas 0.74 ft³

Recommended box

For a sedan, one sub, 3,500 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 volume0.92 ft³ (26 L)
Qtc0.66
Fc42 Hz
F3 (−3 dB, no cabin gain)47 Hz
Example box (outside)14 9/16″ × 14 9/16″ × 11 5/8″
Open sealed box in designer

Ported

Net volume1.45 ft³ (41 L)
Tuning (Fb)28 Hz
Portround port Ø2 1/2″, 9 7/8″ long
Port velocity at 3,500 W733 ft/s
F3 (−3 dB, no cabin gain)25 Hz
Example box (outside)20 7/16″ × 15 3/4″ × 11 5/8″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs31 Hz
Qts0.49
Qes0.534
Qms6
Vas0.74 ft³
Re (one coil)≈ 1.7 Ω
Sd≈ 76 in²
Xmax≈ 0.39″
EBP58 — sealed or ported calc.
Sensitivity, 1 W / 1 m82.7 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power3,500 W

Mounting dimensions

Ø13″cutout Ø11 7/16″mounting depth 9 3/16″magnet Ø9 1/16″
Cutout diameter11 7/16″
Mounting depth9 3/16″
Overall diameter13″
Magnet diameter9 1/16″

Only Qts is published — Qms assumed to be 6 and Qes calculated (barely affects box design).

“≈” 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 Swat 12″ models