Soundstream PXW-12
12″ subwoofer · dual 4 Ω · 450 W RMS
| 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, 450 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 · 1.19 |
|---|---|
| Fc | 46 Hz |
| F3 (−3 dB, no cabin gain) | 36 Hz |
| Example box (outside) | 14 3/16″ × 14 3/16″ × 20 9/16″ |
Ported
deeper, louder| Tuning (Fb) | 31 Hz |
|---|---|
| Port | slot 1 9/16 × 14 5/16″, 24 5/16″ long |
| Port velocity at 450 W | 50 ft/s |
| F3 (−3 dB, no cabin gain) | 31 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 12 1/2″ |
Deeper: 2.90 ft³ (82 L) tuned to 35 Hz, 31 1/2″ × 15 3/4″ × 14 9/16″ 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 | 450 W |
| Fs | 27.8 Hz |
| Qts | 0.71 |
| Qes | 0.84 |
| Qms | 4.73 |
| Vas | 3.04 ft³ |
| Re (one coil) | 3.6 Ω |
|---|---|
| Sd | 75 in² |
| Xmax | 0.40″ |
| Vd | 29.8 in³ calc. |
| Mms | 126 g calc. |
| BL | 9.7 T·m calc. |
| EBP | 33 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 85.4 dB calc. |
Mounting dimensions
| Cutout diameter | 11 1/8″ |
|---|---|
| Mounting depth | 6 1/2″ |
| Overall diameter | 12 1/2″ |
“≈” 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/20090407090326/http://www.soundstream.com:80/manuals/2009/Pi
- web.archive.org/web/20101128195245/http://www.soundstream.com:80/manuals/2009/Pi
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-12/2 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
- Soundstream SPL MULE 12″ · 4 Ω
Similar 12″ subwoofers from other brands
Close in Fs, Qts and Vas — a box of similar volume will suit them.
- Polk Audio dX12-8 1.80 ft³ sealed · 2.37 ft³ ported
- Pioneer TS-300D4 1.80 ft³ sealed · 2.26 ft³ ported
- Pioneer TS-W120D4 1.80 ft³ sealed · 2.26 ft³ ported
- Pioneer TS-W304R 1.80 ft³ sealed · 2.19 ft³ ported
- Bomber Upgrade 375W 4 Ohm (SW12UP-375-4) 1.91 ft³ sealed · 2.51 ft³ ported
- Kicx STQ 300NEW (4+4) 1.80 ft³ sealed · 2.33 ft³ ported
FAQ
What box does the Soundstream PXW-12 need?
Recommended net volume: 1.70 ft³ sealed, 2.22 ft³ ported tuned to 31 Hz — for one sub in a sedan at 450 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.
What are the Soundstream PXW-12 Thiele/Small specs?
Fs 27.8 Hz, Qts 0.71, Vas 3.04 ft³, Xmax 0.40″, Sd 75 in².
What is the Soundstream PXW-12 mounting depth?
Mounting depth is 6 1/2″, 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 PXW-12 handle and how do I wire it?
RMS power rating: 450 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.