Soundstream T4-12
12″ subwoofer · dual 1 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 | 0 of 4 — missing: cutout, mounting depth, frame outer diameter, 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) | Dry and tight · 0.58 |
|---|---|
| Fc | 57 Hz |
| F3 (−3 dB, no cabin gain) | 75 Hz |
| Example box (outside) | 14 3/16″ × 14 3/16″ × 10 1/16″ |
Ported
deeper, louder| Tuning (Fb) | 34 Hz |
|---|---|
| Port | slot 2 15/16 × 14 5/16″, 37 15/16″ long |
| Port velocity at 900 W | 63 ft/s |
| F3 (−3 dB, no cabin gain) | 31 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 15 3/8″ |
Deeper: 1.45 ft³ (41 L) tuned to 34 Hz, 31 1/2″ × 15 3/4″ × 11 1/16″ 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 | 12″ |
|---|---|
| Voice coils | dual 1 Ω |
| RMS power | 900 W |
| Fs | 36.5 Hz |
| Qts | 0.37 |
| Qes | 0.414 |
| Qms | 3.58 |
| Vas | 1.03 ft³ |
|---|---|
| Re (one coil) | ≈ 0.85 Ω |
| Sd | ≈ 76 in² |
| Xmax | 0.63″ |
| EBP | 88 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 87.4 dB calc. |
Mounting dimensions
| Cutout diameter | ≈ 11 1/8″ |
|---|---|
| Mounting depth | ≈ 5 7/8″ |
“≈” 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 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.
- Massive Audio SUMMO124 0.79 ft³ sealed · 2.44 ft³ ported
- Orion HCCA 12D 0.71 ft³ sealed · 2.26 ft³ ported
- ESX VE1222 (2x2 Ohm) 0.83 ft³ sealed · 2.33 ft³ ported
- Gladen SQL 12 (SVC 4 ohm) 0.72 ft³ sealed · 2.26 ft³ ported
- Fi Audio Q12 D1 0.67 ft³ sealed · 2.19 ft³ ported
- Fi Audio Q12 NEO D1 1.06 ft³ sealed · 2.19 ft³ ported
FAQ
What box does the Soundstream T4-12 need?
Recommended net volume: 0.71 ft³ sealed, 2.26 ft³ ported tuned to 34 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 T4-12 Thiele/Small specs?
Fs 36.5 Hz, Qts 0.37, Vas 1.03 ft³, Xmax 0.63″.
How much power does the Soundstream T4-12 handle and how do I wire it?
RMS power rating: 900 W. Dual 1 Ω voice coils: series gives 2 Ω, parallel gives 0.5 Ω at the amp. Wiring for several subs and amp power — in the wiring calculator.