Soundstream RW-12
12″ subwoofer · dual 4 Ω · 600 W RMS
The Soundstream RW-12 is a 12″ subwoofer. With Qts 0.47 and EBP 46 it suits a sealed box: tight bass in a small enclosure; a ported box would need a lot of volume.
| 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, 600 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) | Tight and punchy · 0.80 |
|---|---|
| Fc | 42 Hz |
| F3 (−3 dB, no cabin gain) | 40 Hz |
| Example box (outside) | 14 3/16″ × 14 3/16″ × 14 3/16″ |
Ported
deeper, louder| Tuning (Fb) | 30 Hz |
|---|---|
| Port | slot 1 9/16 × 14 5/16″, 36 7/16″ long |
| Port velocity at 600 W | 62 ft/s |
| F3 (−3 dB, no cabin gain) | 28 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 11 1/8″ |
Deeper: 3.07 ft³ (87 L) tuned to 25 Hz, 31 1/2″ × 15 3/4″ × 17 11/16″ 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 | 600 W |
| Fs | 24.8 Hz |
| Qts | 0.47 |
| Qes | 0.536 |
| Qms | 3.91 |
| Vas | 2.07 ft³ |
| Re (one coil) | 3.34 Ω |
|---|---|
| Sd | 79.8 in² |
| Xmax | 0.55″ |
| Vd | 44 in³ calc. |
| Mms | 265 g calc. |
| BL | 16 T·m calc. |
| EBP | 46 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 84.2 dB calc. |
Mounting dimensions
| Cutout diameter | 11 1/8″ |
|---|---|
| Mounting depth | 6 1/2″ |
| Overall diameter | 12 3/8″ |
Where it fits in a vehicle
Spots from our vehicle guides where the cutout, mounting depth and recommended box fit. The spot sizes are approximate — measure your own vehicle.
- Bronco 4-door — behind the rear seat sealed and ported box
- Wrangler 4-door, hard top — behind the rear seat sealed and ported box
- Wrangler 4-door, soft top — behind the rear seat sealed and ported box
- Silverado / Sierra Crew Cab — under the rear seat sealed and ported box
- FJ Cruiser — behind the rear seat sealed and ported box
- El Camino 1978–87 — behind the seat sealed and ported box
- Cherokee XJ — cargo area, spare moved out sealed and ported box
- Excursion — behind the third row sealed and ported box
- Mustang 2015–2023 coupe — trunk sealed and ported box
- Challenger / Charger — trunk sealed and ported box
- Club Car Precedent — under the rear seat sealed box
“≈” 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/20100104101508/http://soundstream.com/manuals/2009/Reference
- web.archive.org/web/20080719094614/http://www.soundstream.com/manuals/2007/WOOFE
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 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.
- Rockford Fosgate Power T0D212 1.06 ft³ sealed · 1.59 ft³ ported
- Diamond DE122 1.02 ft³ sealed · 1.48 ft³ ported
- Sundown Audio SDv3-12 D2 1.45 ft³ sealed · 1.70 ft³ ported
- Rockford Fosgate Punch P3D2-12 1.24 ft³ sealed · 1.59 ft³ ported
- Audison Voce II AV 12 D2 II (DVC 2+2 ohm) 1.13 ft³ sealed · 1.77 ft³ ported
- Sundown Audio SDv3-12 D4 1.34 ft³ sealed · 1.77 ft³ ported
- Audiobahn AWES12P 1.41 ft³ sealed · 1.70 ft³ ported
FAQ
What box does the Soundstream RW-12 need?
Recommended net volume: 1.09 ft³ sealed, 1.66 ft³ ported tuned to 30 Hz — for one sub in a sedan at 600 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.
What are the Soundstream RW-12 Thiele/Small specs?
Fs 24.8 Hz, Qts 0.47, Vas 2.07 ft³, Xmax 0.55″, Sd 79.8 in².
What is the Soundstream RW-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 RW-12 handle and how do I wire it?
RMS power rating: 600 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.
Is the Soundstream RW-12 better sealed or ported?
EBP 46: a sealed box (1.09 ft³) suits it best — tight bass in a compact enclosure. Ported is possible (1.66 ft³, tuned to 30 Hz) but larger.
What port does the Soundstream RW-12 need?
For the 1.66 ft³ ported box tuned to 30 Hz: slot 1 9/16 × 14 5/16″, 36 7/16″ long, area 22.6 in²; or a round port Ø5 3/8″, ≈ 36 7/16″ long. Port air speed at 600 W: 62 ft/s.
What box do two Soundstream RW-12 subs need?
Two subs need twice the volume: 2.19 ft³ sealed, or 3.32 ft³ ported at the same 30 Hz tuning with twice the port area. One shared chamber or one per sub — whatever fits your vehicle.