Soundstream R1-15
15″ subwoofer · dual 4 Ω · 900 W RMS
| Source | web.archive.org · manufacturer data |
|---|---|
| Checked against source | October 2026 |
| Thiele/Small parameters | not in the spec sheet: Re, Sd — typical value for the size used |
| Mounting dimensions | 3 of 4 — missing: magnet diameter; the designer will use an estimate |
Recommended box
For a sedan, one sub, 900 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 | 42 Hz |
| F3 (−3 dB, no cabin gain) | 34 Hz |
| Example box (outside) | 31 1/2″ × 18 1/8″ × 11 3/4″ |
Ported
deeper, louder| Tuning (Fb) | 31 Hz |
|---|---|
| Port | slot 1 3/4 × 16 11/16″, 25″ long |
| Port velocity at 900 W | 64 ft/s |
| F3 (−3 dB, no cabin gain) | 30 Hz |
| Example box (outside) | 31 1/2″ × 18 1/8″ × 13 9/16″ |
Deeper: 4.80 ft³ (136 L) tuned to 31 Hz, 31 1/2″ × 18 1/8″ × 20 13/16″ 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 | 15″ |
|---|---|
| Voice coils | dual 4 Ω |
| RMS power | 900 W |
| Fs | 28 Hz |
| Qts | 0.68 |
| Qes | 0.803 |
| Qms | 4.45 |
| Vas | 3.48 ft³ |
|---|---|
| Re (one coil) | ≈ 3.4 Ω |
| Sd | ≈ 124 in² |
| Xmax | 0.39″ |
| EBP | 35 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 86.3 dB calc. |
Mounting dimensions
| Cutout diameter | 14 1/4″ |
|---|---|
| Mounting depth | 8 3/4″ |
| Overall diameter | 15 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 15″ models
- Soundstream PCW-15 15″ · dual 4 Ω
- Soundstream PWS-15 15″ · dual 4 Ω
- Soundstream PXW-15 15″ · dual 4 Ω
- Soundstream PXW-15/2 15″ · dual 2 Ω
- Soundstream R1-15L 15″ · dual 4 Ω
- Soundstream R3.15 15″ · dual 2 Ω
- Soundstream RBW-15 15″ · dual 4 Ω
- Soundstream SPLX-152 ('07-'08) 15″ · dual 2 Ω
- Soundstream SPLX-152 (2006) 15″ · dual 2 Ω
- Soundstream SPLX-152HX 15″ · dual 2 Ω
- Soundstream SPLX-154 ('07-'08) 15″ · 4 Ω
- Soundstream SPLX-154 (2006) 15″ · 4 Ω
Similar 15″ subwoofers from other brands
Close in Fs, Qts and Vas — a box of similar volume will suit them.
- Bomber Bicho Papão 1200W 4+4 Ohm (SW15BPF1200-4+4) 2.75 ft³ sealed · 2.93 ft³ ported
- Machete MF-15S D2 2.83 ft³ sealed · 2.44 ft³ ported
- Dayton Audio UM15-22 2.86 ft³ sealed · 2.90 ft³ ported
- JBL GT5-15 3.04 ft³ sealed · 3.00 ft³ ported
- Dayton Audio UMII15-22 2.79 ft³ sealed · 2.72 ft³ ported
- DD Audio 615d D2 2.83 ft³ sealed · 3.25 ft³ ported
FAQ
What box does the Soundstream R1-15 need?
Recommended net volume: 2.83 ft³ sealed, 2.79 ft³ ported tuned to 31 Hz — for one sub in a sedan at 900 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.
What are the Soundstream R1-15 Thiele/Small specs?
Fs 28 Hz, Qts 0.68, Vas 3.48 ft³, Xmax 0.39″.
What is the Soundstream R1-15 mounting depth?
Mounting depth is 8 3/4″, cutout diameter 14 1/4″. The inside depth of the box must exceed the mounting depth by at least 1″.
How much power does the Soundstream R1-15 handle and how do I wire it?
RMS power rating: 900 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.