Swat HLG-P15D2

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

Fs 30 HzQts 0.52Vas 1.87 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 volume1.50 ft³ (42.5 L)
Qtc0.78
Fc45 Hz
F3 (−3 dB, no cabin gain)43 Hz
Example box (outside)17 5/16″ × 17 5/16″ × 12 7/8″
Open sealed box in designer

Ported

Net volume4.31 ft³ (122 L)
Tuning (Fb)26 Hz
Portslot 5 5/16 × 16 11/16″, 73 5/8″ long
Port velocity at 3,500 W68 ft/s
F3 (−3 dB, no cabin gain)23 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 31 3/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs30 Hz
Qts0.52
Qes0.569
Qms6
Vas1.87 ft³
Re (one coil)≈ 1.7 Ω
Sd≈ 124 in²
Xmax≈ 0.39″
EBP53 — sealed or ported calc.
Sensitivity, 1 W / 1 m86 dB calc.

General

Size15″
Voice coilsdual 2 Ω
RMS power3,500 W

Mounting dimensions

Ø15 5/8″cutout Ø14 5/16″mounting depth 10 7/16″magnet Ø9 1/16″
Cutout diameter14 5/16″
Mounting depth10 7/16″
Overall diameter15 5/8″
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 15″ models