SPL Dynamics V-250S4

10″ subwoofer · 4 Ω · 300 W RMS

32.6 HzFs, resonance

0.47Qts

1.20 ft³Vas

0.33″Xmax

300 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, 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

smaller, tighter

0.64 ft³ (18 L)

Net volume

Bass character (Qtc)	Tight and punchy · 0.80
Fc	55 Hz
F3 (−3 dB, no cabin gain)	52 Hz
Example box (outside)	12 3/16″ × 12 3/16″ × 11 13/16″

Open sealed box in designer

Ported

deeper, louder

0.95 ft³ (27 L)

Net volume

Tuning (Fb)	36 Hz
Port	2 round ports Ø2 1/2″, 19 3/4″ long
Port velocity at 300 W	79 ft/s
F3 (−3 dB, no cabin gain)	36 Hz
Example box (outside)	23 5/16″ × 15 3/4″ × 7 7/8″

Open ported box in designer

Deeper: 2.08 ft³ (59 L) tuned to 30 Hz, 31 1/2″ × 15 3/4″ × 12 1/16″ 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	10″
Voice coils	4 Ω
RMS power	300 W
Fs	32.6 Hz
Qts	0.47
Qes	0.543
Qms	3.63
Vas	1.20 ft³

Re	3.2 Ω
Sd	54.7 in²
Xmax	0.33″
Vd	18.3 in³ calc.
Mms	124 g calc.
BL	12.2 T·m calc.
EBP	60 — sealed or ported calc.
Sensitivity, 1 W / 1 m	85.4 dB calc.

Mounting dimensions

Cutout diameter	9 3/16″
Mounting depth	5 7/16″
Overall diameter	10 7/8″

Cone area (Sd) calculated from Fs, Vas and Mms: 54.7 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/20120610175149/http://www.spldynamics.fi:80/products/subwoof

Other SPL Dynamics 10″ models

SPL Dynamics PRO-10D2 MK3 10″ · dual 2 Ω
SPL Dynamics PRO-10D2 MK4 10″ · dual 2 Ω
SPL Dynamics PRO-10D4 MK3 10″ · dual 4 Ω
SPL Dynamics PRO-10D4 MK4 10″ · dual 4 Ω
SPL Dynamics PRO-250D2 10″ · dual 2 Ω
SPL Dynamics SW-250D2 10″ · dual 2 Ω
SPL Dynamics V-10S 10″ · 4 Ω
SPL Dynamics V-10S4 10″ · 4 Ω
SPL Dynamics V-250D2 10″ · dual 2 Ω
SPL Dynamics V-250D4 10″ · dual 4 Ω
SPL Dynamics XTR-250D2 10″ · dual 2 Ω
SPL Dynamics XTR-250D4 10″ · dual 4 Ω

Similar 10″ subwoofers from other brands

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

Polk Audio MM104 (Polk/MOMO) 0.57 ft³ sealed · 0.88 ft³ ported
JL Audio 10W3v3-8 0.71 ft³ sealed · 1.13 ft³ ported
Helix IK S10-DVC2 (2x2 Ohm) 0.57 ft³ sealed · 0.95 ft³ ported
Helix K 10S-DVC2 (2x2 Ohm) 0.57 ft³ sealed · 0.95 ft³ ported
JL Audio 10W3v3-2 0.71 ft³ sealed · 1.13 ft³ ported
MTX Audio RT10-04 0.67 ft³ sealed · 0.92 ft³ ported

FAQ

What box does the SPL Dynamics V-250S4 need?

Recommended net volume: 0.64 ft³ sealed, 0.95 ft³ ported tuned to 36 Hz — for one sub in a sedan at 300 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.

What are the SPL Dynamics V-250S4 Thiele/Small specs?

Fs 32.6 Hz, Qts 0.47, Vas 1.20 ft³, Xmax 0.33″, Sd 54.7 in².

What is the SPL Dynamics V-250S4 mounting depth?

Mounting depth is 5 7/16″, cutout diameter 9 3/16″. The inside depth of the box must exceed the mounting depth by at least 1″.

How much power does the SPL Dynamics V-250S4 handle and how do I wire it?

RMS power rating: 300 W. Wiring for several subs and amp power — in the wiring calculator.