Soundstream SPL MULE

12″ subwoofer · 4 Ω · 500 W RMS

26.8 HzFs, resonance

0.85Qts

3.32 ft³Vas

0.43″Xmax

500 WRMS

Source	web.archive.org · 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, 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

1.66 ft³ (47 L)

Net volume

Bass character (Qtc)	Boomy, with a bump · 1.47
Fc	46 Hz
F3 (−3 dB, no cabin gain)	34 Hz
Example box (outside)	31 1/2″ × 15 3/4″ × 8 1/2″

Open sealed box in designer

Ported

deeper, louder

2.15 ft³ (61 L)

Net volume

Tuning (Fb)	30 Hz
Port	slot 1 9/16 × 14 5/16″, 27 3/16″ long
Port velocity at 500 W	48 ft/s
F3 (−3 dB, no cabin gain)	30 Hz
Example box (outside)	31 1/2″ × 15 3/4″ × 12 7/16″

Open ported box in designer

Deeper: 2.83 ft³ (80 L) tuned to 37 Hz, 31 1/2″ × 15 3/4″ × 14 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	500 W
Fs	26.8 Hz
Qts	0.85
Qes	0.92
Qms	10.6
Vas	3.32 ft³

Re	3.64 Ω
Sd	73 in²
Xmax	0.43″
Vd	31.6 in³ calc.
Mms	118 g calc.
BL	8.9 T·m calc.
EBP	29 — suits sealed calc.
Sensitivity, 1 W / 1 m	84.9 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

web.archive.org/web/20060908195938/http://www.soundstream.com:80/manuals/sbw/spl

Other Soundstream 12″ models

Soundstream EXACT 12 12″ · 4 Ω
Soundstream PCW-12 12″ · dual 4 Ω
Soundstream PSW.124 12″ · 4 Ω
Soundstream PWS-12 12″ · dual 4 Ω
Soundstream PXW-12 12″ · dual 4 Ω
Soundstream PXW-12/2 12″ · dual 2 Ω
Soundstream R1-12 12″ · dual 4 Ω
Soundstream R1-12L 12″ · dual 4 Ω
Soundstream R3.12 12″ · dual 2 Ω
Soundstream RBW-12 12″ · dual 4 Ω
Soundstream RFW-12 12″ · dual 4 Ω
Soundstream RW-12 12″ · dual 4 Ω

Similar 12″ subwoofers from other brands

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

Kenwood KFC-W3013PS 1.80 ft³ sealed · 2.33 ft³ ported
Pioneer TS-W126M 1.80 ft³ sealed · 2.37 ft³ ported
Pioneer TS-W306R 1.80 ft³ sealed · 2.37 ft³ ported
Quantum Audio QW1000/12D4 1.87 ft³ sealed · 2.40 ft³ ported
Hifonics HWX12D4 (12" DVC 4ohm) 1.80 ft³ sealed · 2.33 ft³ ported
Pyle PLW12RD 1.73 ft³ sealed · 2.26 ft³ ported

FAQ

What box does the Soundstream SPL MULE need?

Recommended net volume: 1.66 ft³ sealed, 2.15 ft³ ported tuned to 30 Hz — for one sub in a sedan at 500 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.

What are the Soundstream SPL MULE Thiele/Small specs?

Fs 26.8 Hz, Qts 0.85, Vas 3.32 ft³, Xmax 0.43″, Sd 73 in².

How much power does the Soundstream SPL MULE handle and how do I wire it?

RMS power rating: 500 W. Wiring for several subs and amp power — in the wiring calculator.