Sony XS-L12S

12″ subwoofer · 4 Ω · 380 W RMS

32.3 HzFs, resonance

0.57Qts

1.39 ft³Vas

0.22″Xmax

380 WRMS

Source	sony.com · manufacturer data
Checked against source	October 2026
Thiele/Small parameters	complete
Mounting dimensions	0 of 4 — missing: cutout, mounting depth, frame outer diameter, magnet diameter; the designer will use an estimate

Recommended box

For a sedan, one sub, 380 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

1.41 ft³ (40 L)

Net volume

Bass character (Qtc)	Tight and punchy · 0.80
Fc	46 Hz
F3 (−3 dB, no cabin gain)	43 Hz
Example box (outside)	14 3/16″ × 14 3/16″ × 17 9/16″

Open sealed box in designer

Ported

deeper, louder

1.20 ft³ (34 L)

Net volume

Tuning (Fb)	34 Hz
Port	slot 1 9/16 × 14 5/16″, 39 9/16″ long
Port velocity at 380 W	38 ft/s
F3 (−3 dB, no cabin gain)	33 Hz
Example box (outside)	31 1/2″ × 15 3/4″ × 9 1/2″

Open ported box in designer

Deeper: 2.93 ft³ (83 L) tuned to 29 Hz, 31 1/2″ × 15 3/4″ × 15 3/8″ 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	12″
Voice coils	4 Ω
RMS power	380 W
Fs	32.3 Hz
Qts	0.57
Qes	0.75
Qms	2.36
Vas	1.39 ft³

Re	3.6 Ω
Sd	76.1 in²
Xmax	0.22″
Vd	17.1 in³ calc.
Mms	210 g calc.
BL	14.3 T·m calc.
EBP	43 — suits sealed calc.
Sensitivity, 1 W / 1 m	84.5 dB calc.

Mounting dimensions

Cutout diameter	≈ 11 1/8″
Mounting depth	≈ 5 7/8″

“≈” 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 Sony 12″ models

Sony XS-GSW121D 12″ · dual 4 Ω
Sony XS-GTR120L 12″ · 4 Ω
Sony XS-GTR121L 12″ · 4 Ω
Sony XS-GTX120L 12″ · 4 Ω
Sony XS-GTX121L 12″ · 4 Ω
Sony XS-W122ES 12″ · 2 Ω
Sony XS-W124ES 12″ · 4 Ω

Similar 12″ subwoofers from other brands

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

Phoenix Gold Ti312D4 (Ti3, DVC 4 ohm) 1.31 ft³ sealed · 1.27 ft³ ported
Power Acoustik GW-124 1.59 ft³ sealed · 1.20 ft³ ported
Cerwin-Vega Mobile VMAX124 (VMAX 12" DVC 4ohm) 1.55 ft³ sealed · 1.59 ft³ ported
Fi Audio Alpha 12 S2 1.52 ft³ sealed · 1.24 ft³ ported
Fi Audio Alpha 12 S4 1.52 ft³ sealed · 1.24 ft³ ported
Fi Audio FiDay 12 S2 1.52 ft³ sealed · 1.24 ft³ ported

FAQ

What box does the Sony XS-L12S need?

Recommended net volume: 1.41 ft³ sealed, 1.20 ft³ ported tuned to 34 Hz — for one sub in a sedan at 380 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.

What are the Sony XS-L12S Thiele/Small specs?

Fs 32.3 Hz, Qts 0.57, Vas 1.39 ft³, Xmax 0.22″, Sd 76.1 in².

How much power does the Sony XS-L12S handle and how do I wire it?

RMS power rating: 380 W. Wiring for several subs and amp power — in the wiring calculator.