Soundstream XW-12
12″ subwoofer · dual 4 Ω · 150 W RMS
| Source | web.archive.org · manufacturer data |
|---|---|
| Checked against source | October 2026 |
| Thiele/Small parameters | not in the spec sheet: Re, Sd — typical value for the size used |
| Mounting dimensions | 3 of 4 — missing: magnet diameter; the designer will use an estimate |
Recommended box
For a sedan, one sub, 150 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| Bass character (Qtc) | Boomy, with a bump · 1.16 |
|---|---|
| Fc | 51 Hz |
| F3 (−3 dB, no cabin gain) | 39 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 8 3/4″ |
Ported
deeper, louder| Tuning (Fb) | 34 Hz |
|---|---|
| Port | slot 1 9/16 × 14 5/16″, 31 1/4″ long |
| Port velocity at 150 W | 25 ft/s |
| F3 (−3 dB, no cabin gain) | 36 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 10 1/16″ |
Deeper: 2.93 ft³ (83 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
Projects with this subwoofer
Boxes that users designed and published: plans, cut sheet and response graph.
Thiele/Small parameters
| Size | 12″ |
|---|---|
| Voice coils | dual 4 Ω |
| RMS power | 150 W |
| Fs | 35.3 Hz |
| Qts | 0.81 |
| Qes | 0.902 |
| Qms | 7.62 |
| Vas | 1.84 ft³ |
|---|---|
| Re (one coil) | ≈ 3.4 Ω |
| Sd | ≈ 76 in² |
| Xmax | 0.37″ |
| EBP | 39 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 86.1 dB calc. |
Mounting dimensions
| Cutout diameter | 11 1/8″ |
|---|---|
| Mounting depth | 5 1/8″ |
| Overall diameter | 12 5/8″ |
“≈” 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 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.
- MTX Audio 5512-44 1.98 ft³ sealed · 1.80 ft³ ported
- CT Sounds BIO-12 D4 1.77 ft³ sealed · 1.02 ft³ ported
- Hinor HSW12 Carbono 1.87 ft³ sealed · 1.41 ft³ ported
- Black Hydra Delta-12S 1.73 ft³ sealed · 1.20 ft³ ported
- Earthquake TNT-12S 1.73 ft³ sealed · 1.31 ft³ ported
- JBL MS-12SD2 1.80 ft³ sealed · 1.38 ft³ ported
FAQ
What box does the Soundstream XW-12 need?
Recommended net volume: 1.73 ft³ sealed, 1.48 ft³ ported tuned to 34 Hz — for one sub in a sedan at 150 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.
What are the Soundstream XW-12 Thiele/Small specs?
Fs 35.3 Hz, Qts 0.81, Vas 1.84 ft³, Xmax 0.37″.
What is the Soundstream XW-12 mounting depth?
Mounting depth is 5 1/8″, cutout diameter 11 1/8″. The inside depth of the box must exceed the mounting depth by at least 1″.
How much power does the Soundstream XW-12 handle and how do I wire it?
RMS power rating: 150 W. Dual 4 Ω voice coils: series gives 8 Ω, parallel gives 2 Ω at the amp. Wiring for several subs and amp power — in the wiring calculator.