Soundstream R1-12
12″ subwoofer · dual 4 Ω · 800 W RMS
The Soundstream R1-12 is a 12″ subwoofer. With Qts 0.63 and EBP 38 it suits a sealed box: tight bass in a small enclosure; a ported box would need a lot of volume. Modest excursion (Xmax 0.39″) — for clean sound at moderate levels, not for SPL competitions.
| 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 | 2 of 4 — missing: frame outer diameter, magnet diameter; the designer will use an estimate |
Recommended box
For a sedan, one sub, 800 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 · 0.90 |
|---|---|
| Fc | 39 Hz |
| F3 (−3 dB, no cabin gain) | 33 Hz |
| Example box (outside) | 14 3/16″ × 14 3/16″ × 20 15/16″ |
Ported
deeper, louder| Tuning (Fb) | 30 Hz |
|---|---|
| Port | slot 1 9/16 × 14 5/16″, 41 1/4″ long |
| Port velocity at 800 W | 60 ft/s |
| F3 (−3 dB, no cabin gain) | 29 Hz |
| Example box (outside) | 22 1/2″ × 15 3/4″ × 14 3/4″ |
Deeper: 2.93 ft³ (83 L) tuned to 28 Hz, 31 1/2″ × 15 3/4″ × 17 1/2″ 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 | 800 W |
| Fs | 26.8 Hz |
| Qts | 0.63 |
| Qes | 0.714 |
| Qms | 5.26 |
| Vas | 1.85 ft³ |
|---|---|
| Re (one coil) | ≈ 3.4 Ω |
| Sd | ≈ 76 in² |
| Xmax | 0.39″ |
| EBP | 38 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 83.5 dB calc. |
Mounting dimensions
| Cutout diameter | 11 1/8″ |
|---|---|
| Mounting depth | 7 1/2″ |
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 and ported 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
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 R1-12L 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
- 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.
- Cerwin-Vega Mobile Stroker PRO 12 (12" DVC 2ohm) 1.73 ft³ sealed · 1.20 ft³ ported
- Vibe Audio BlackAir 12 D2 (V4) 1.77 ft³ sealed · 1.48 ft³ ported
- Rockford Fosgate Punch HE2 RFP4212 1.80 ft³ sealed · 1.55 ft³ ported
- Earthquake Magma-12X 1.87 ft³ sealed · 1.70 ft³ ported
- Dayton Audio UM12-22 1.73 ft³ sealed · 1.31 ft³ ported
- Rockford Fosgate Power T1D412 1.94 ft³ sealed · 1.59 ft³ ported
FAQ
What box does the Soundstream R1-12 need?
Recommended net volume: 1.73 ft³ sealed, 1.48 ft³ ported tuned to 30 Hz — for one sub in a sedan at 800 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.
What are the Soundstream R1-12 Thiele/Small specs?
Fs 26.8 Hz, Qts 0.63, Vas 1.85 ft³, Xmax 0.39″.
What is the Soundstream R1-12 mounting depth?
Mounting depth is 7 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 R1-12 handle and how do I wire it?
RMS power rating: 800 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 R1-12 better sealed or ported?
EBP 38: a sealed box (1.73 ft³) suits it best — tight bass in a compact enclosure. Ported is possible (1.48 ft³, tuned to 30 Hz) but larger.
What port does the Soundstream R1-12 need?
For the 1.48 ft³ ported box tuned to 30 Hz: slot 1 9/16 × 14 5/16″, 41 1/4″ long, area 22.6 in²; or a round port Ø5 3/8″, ≈ 41 1/4″ long. Port air speed at 800 W: 60 ft/s.
What box do two Soundstream R1-12 subs need?
Two subs need twice the volume: 3.46 ft³ sealed, or 2.97 ft³ ported at the same 30 Hz tuning with twice the port area. One shared chamber or one per sub — whatever fits your vehicle.