Soundstream RBW-12
12″ subwoofer · dual 4 Ω · 550 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, 550 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 · 1.12 |
|---|---|
| Fc | 45 Hz |
| F3 (−3 dB, no cabin gain) | 35 Hz |
| Example box (outside) | 14 3/16″ × 14 3/16″ × 20 9/16″ |
Ported
deeper, louder| Tuning (Fb) | 33 Hz |
|---|---|
| Port | slot 1 9/16 × 14 5/16″, 29 7/16″ long |
| Port velocity at 550 W | 52 ft/s |
| F3 (−3 dB, no cabin gain) | 32 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 10 5/8″ |
Deeper: 2.90 ft³ (82 L) tuned to 33 Hz, 31 1/2″ × 15 3/4″ × 15 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 | 550 W |
| Fs | 29.9 Hz |
| Qts | 0.75 |
| Qes | 0.838 |
| Qms | 7.26 |
| Vas | 2.07 ft³ |
| Re (one coil) | 3.6 Ω |
|---|---|
| Sd | 75 in² |
| Xmax | 0.41″ |
| Vd | 31 in³ calc. |
| Mms | 160 g calc. |
| BL | 11.4 T·m calc. |
| EBP | 36 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 84.7 dB calc. |
Mounting dimensions
| Cutout diameter | 11 1/8″ |
|---|---|
| Mounting depth | 6 1/2″ |
| 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 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.
- Kicker Solo-Baric L7T 12" 2-Ohm DVC (46L7T122) 2.30 ft³ sealed · 2.01 ft³ ported
- Planet Audio AC12D 1.73 ft³ sealed · 1.70 ft³ ported
- MTX Audio 3512-04S 1.98 ft³ sealed · 1.62 ft³ ported
- Kicker CompRT 12" 4-Ohm DVC (48CWRT124) 1.80 ft³ sealed · 1.48 ft³ ported
- Clarion SRW1285 1.62 ft³ sealed · 1.77 ft³ ported
- Clarion WQ3010D 1.87 ft³ sealed · 1.66 ft³ ported
FAQ
What box does the Soundstream RBW-12 need?
Recommended net volume: 1.70 ft³ sealed, 1.66 ft³ ported tuned to 33 Hz — for one sub in a sedan at 550 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.
What are the Soundstream RBW-12 Thiele/Small specs?
Fs 29.9 Hz, Qts 0.75, Vas 2.07 ft³, Xmax 0.41″, Sd 75 in².
What is the Soundstream RBW-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 RBW-12 handle and how do I wire it?
RMS power rating: 550 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.