Soundstream R3.15
15″ subwoofer · dual 2 Ω · 1,400 W RMS
Fs 31.4 HzQts 1.05Vas 10.48 ft³
The published specs don’t add up:
- Fs, Vas and Sd don't match the moving mass of 160.0019 g (they give 79 g) — one of the spec sheet values is probably wrong.
Recommended box
For a sedan, one sub, 1,400 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
| Net volume | 2.83 ft³ (80 L) |
|---|---|
| Qtc | 2.28 |
| Fc | 68 Hz |
| F3 (−3 dB, no cabin gain) | 47 Hz |
| Example box (outside) | 31 1/2″ × 18 1/2″ × 11 1/2″ |
Ported
| Net volume | 4.80 ft³ (136 L) |
|---|---|
| Tuning (Fb) | 50 Hz |
| Port | slot 3 9/16 × 17 1/16″, 7 1/16″ long |
| Port velocity at 1,400 W | 64 ft/s |
| F3 (−3 dB, no cabin gain) | 46 Hz |
| Example box (outside) | 31 1/2″ × 18 1/2″ × 19 1/16″ |
Thiele/Small parameters
| Fs | 31.4 Hz |
|---|---|
| Qts | 1.05 |
| Qes | 1.309 |
| Qms | 5.33 |
| Vas | 10.48 ft³ |
| Re (one coil) | 2.21 Ω |
| Sd | ≈ 124 in² |
| Xmax | ≈ 0.39″ |
| EBP | 24 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 90.5 dB calc. |
General
| Size | 15″ |
|---|---|
| Voice coils | dual 2 Ω |
| RMS power | 1,400 W |
Mounting dimensions
| Cutout diameter | 14 1/2″ |
|---|---|
| Mounting depth | ≈ 7 1/16″ |
“≈” 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 15″ models
- Soundstream T5.152 15″ · dual 2 Ω