SPL Dynamics SPL-380D2

15″ subwoofer · dual 2 Ω · 1,500 W RMS

33.4 HzFs, resonance

0.38Qts

1.46 ft³Vas

0.45″Xmax

1,500 WRMS

Source	web.archive.org · manufacturer data
Checked against source	October 2026
Thiele/Small parameters	complete
Mounting dimensions	3 of 4 — missing: magnet diameter; the designer will use an estimate

Recommended box

For a sedan, one sub, 1,500 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

smaller, tighter

1.22 ft³ (34.5 L)

Net volume

Bass character (Qtc)	Dry and tight · 0.57
Fc	50 Hz
F3 (−3 dB, no cabin gain)	67 Hz
Example box (outside)	16 15/16″ × 16 15/16″ × 11 7/16″

Open sealed box in designer

Ported

deeper, louder

3.67 ft³ (104 L)

Net volume

Tuning (Fb)	34 Hz
Port	slot 4 1/8 × 16 5/16″, 35 5/8″ long
Port velocity at 1,500 W	65 ft/s
F3 (−3 dB, no cabin gain)	30 Hz
Example box (outside)	31 1/2″ × 17 11/16″ × 20 1/2″

Open ported box in designer

Deeper: 2.37 ft³ (67 L) tuned to 30 Hz, 31 1/2″ × 17 11/16″ × 16″ outside — a bigger box with flatter deep bass. Open in the calculator

Where to buy Amazon

Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Size	15″
Voice coils	dual 2 Ω
RMS power	1,500 W
Fs	33.4 Hz
Qts	0.38
Qes	0.425
Qms	3.72
Vas	1.46 ft³

Re (one coil)	1.9 Ω
Sd	123.6 in²
Xmax	0.45″
Vd	56 in³ calc.
Mms	495 g calc.
BL	21.6 T·m calc.
EBP	79 — sealed or ported calc.
Sensitivity, 1 W / 1 m	87.6 dB calc.

Mounting dimensions

Cutout diameter	13 7/8″
Mounting depth	8 15/16″
Overall diameter	15 9/16″

Cone area (Sd) calculated from Fs, Vas and Mms: 123.6 in².

“≈” 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

web.archive.org/web/20120426224358/http://www.spldynamics.fi:80/products/subwoof

Other SPL Dynamics 15″ models

SPL Dynamics PRO-15D2 MK3 15″ · dual 2 Ω
SPL Dynamics PRO-15D2 MK4 15″ · dual 2 Ω
SPL Dynamics PRO-15D4 MK3 15″ · dual 4 Ω
SPL Dynamics PRO-15D4 MK4 15″ · dual 4 Ω
SPL Dynamics PRO-380D2 15″ · dual 2 Ω
SPL Dynamics PRO-380D4 15″ · dual 4 Ω
SPL Dynamics SPL-380D1A 15″ · dual 1 Ω
SPL Dynamics XTR-380D2S 15″ · dual 2 Ω
SPL Dynamics XTR-380D4S 15″ · dual 4 Ω

Similar 15″ subwoofers from other brands

Close in Fs, Qts and Vas — a box of similar volume will suit them.

Fi Audio MT 15 D2 1.59 ft³ sealed · 3.71 ft³ ported
Fi Audio TEAM 15 D2 1.62 ft³ sealed · 3.71 ft³ ported
Fi Audio TEAM v2 15 D2 1.59 ft³ sealed · 3.71 ft³ ported
American Bass XMAXXX-1511 1.64 ft³ sealed · 3.60 ft³ ported
Swat EXE-15D2 v.3 1.39 ft³ sealed · 1.98 ft³ ported
American Bass XMAXXX-1522 1.64 ft³ sealed · 3.60 ft³ ported

FAQ

What box does the SPL Dynamics SPL-380D2 need?

Recommended net volume: 1.22 ft³ sealed, 3.67 ft³ ported tuned to 34 Hz — for one sub in a sedan at 1,500 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.

What are the SPL Dynamics SPL-380D2 Thiele/Small specs?

Fs 33.4 Hz, Qts 0.38, Vas 1.46 ft³, Xmax 0.45″, Sd 123.6 in².

What is the SPL Dynamics SPL-380D2 mounting depth?

Mounting depth is 8 15/16″, cutout diameter 13 7/8″. The inside depth of the box must exceed the mounting depth by at least 1″.

How much power does the SPL Dynamics SPL-380D2 handle and how do I wire it?

RMS power rating: 1,500 W. Dual 2 Ω voice coils: series gives 4 Ω, parallel gives 1 Ω at the amp. Wiring for several subs and amp power — in the wiring calculator.