Soundstream STEALTH-124
12″ subwoofer · dual 4 Ω · 350 W RMS
| Source | web.archive.org · manufacturer data |
|---|---|
| Checked against source | October 2026 |
| Thiele/Small parameters | complete |
| Mounting dimensions | 1 of 4 — missing: cutout, frame outer diameter, magnet diameter; the designer will use an estimate |
Recommended box
For a sedan, one sub, 350 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 · 1.02 |
|---|---|
| Fc | 45 Hz |
| F3 (−3 dB, no cabin gain) | 36 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 8 3/4″ |
Ported
deeper, louder| Tuning (Fb) | 33 Hz |
|---|---|
| Port | slot 1 9/16 × 14 5/16″, 28 3/4″ long |
| Port velocity at 350 W | 43 ft/s |
| F3 (−3 dB, no cabin gain) | 32 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 10 11/16″ |
Deeper: 2.93 ft³ (83 L) tuned to 33 Hz, 31 1/2″ × 15 3/4″ × 14 7/8″ 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 | 350 W |
| Fs | 30 Hz |
| Qts | 0.69 |
| Qes | 0.81 |
| Qms | 4.53 |
| Vas | 2.10 ft³ |
| Re (one coil) | 3.62 Ω |
|---|---|
| Sd | 75.5 in² |
| Xmax | 0.51″ |
| Vd | 38.7 in³ calc. |
| Mms | 159 g calc. |
| BL | 11.6 T·m calc. |
| EBP | 37 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 85 dB calc. |
Mounting dimensions
| Cutout diameter | ≈ 11 1/8″ |
|---|---|
| Mounting depth | 3 1/2″ |
Cone area (Sd) calculated from Fs, Vas and Mms: 75.5 in².
“≈” 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 3512-04S 1.98 ft³ sealed · 1.62 ft³ ported
- Crunch GTi124 1.87 ft³ sealed · 1.66 ft³ ported
- Clarion WQ3010D 1.87 ft³ sealed · 1.66 ft³ ported
- Kicker Solo-Baric L7S 12" 4-Ohm DVC (44L7S124) 2.30 ft³ sealed · 2.51 ft³ ported
- Rockford Fosgate Prime R2SD2-12 (Shallow) 1.87 ft³ sealed · 1.84 ft³ ported
- Rockford Fosgate Prime R2SD4-12 (Shallow) 1.87 ft³ sealed · 1.84 ft³ ported
FAQ
What box does the Soundstream STEALTH-124 need?
Recommended net volume: 1.73 ft³ sealed, 1.70 ft³ ported tuned to 33 Hz — for one sub in a sedan at 350 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.
What are the Soundstream STEALTH-124 Thiele/Small specs?
Fs 30 Hz, Qts 0.69, Vas 2.10 ft³, Xmax 0.51″, Sd 75.5 in².
What is the Soundstream STEALTH-124 mounting depth?
Mounting depth is 3 1/2″. The inside depth of the box must exceed the mounting depth by at least 1″.
How much power does the Soundstream STEALTH-124 handle and how do I wire it?
RMS power rating: 350 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.