Soundstream T7.124
12″ subwoofer · dual 4 Ω · 800 W RMS
| Source | web.archive.org · manufacturer data |
|---|---|
| Checked against source | October 2026 |
| Thiele/Small parameters | complete |
| Mounting dimensions | 3 of 4 — missing: 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 · 0.80 |
|---|---|
| Fc | 50 Hz |
| F3 (−3 dB, no cabin gain) | 47 Hz |
| Example box (outside) | 14 3/16″ × 14 3/16″ × 16 1/16″ |
Ported
deeper, louder| Tuning (Fb) | 34 Hz |
|---|---|
| Port | slot 1 9/16 × 14 5/16″, 37 1/8″ long |
| Port velocity at 800 W | 63 ft/s |
| F3 (−3 dB, no cabin gain) | 35 Hz |
| Example box (outside) | 21 5/16″ × 15 3/4″ × 13 3/4″ |
Deeper: 3.07 ft³ (87 L) tuned to 30 Hz, 31 1/2″ × 15 3/4″ × 17 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 | 12″ |
|---|---|
| Voice coils | dual 4 Ω |
| RMS power | 800 W |
| Fs | 34.2 Hz |
| Qts | 0.55 |
| Qes | 0.61 |
| Qms | 5.48 |
| Vas | 1.45 ft³ |
| Re (one coil) | 3.62 Ω |
|---|---|
| Sd | 79.8 in² |
| Xmax | 0.59″ |
| Vd | 47.1 in³ calc. |
| Mms | 199 g calc. |
| BL | 15.9 T·m calc. |
| EBP | 56 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 86.3 dB calc. |
Mounting dimensions
| Cutout diameter | 11 1/8″ |
|---|---|
| Mounting depth | 6 5/8″ |
| Overall diameter | 12 1/2″ |
“≈” 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.
- Hifonics ZSPL12D2 1.20 ft³ sealed · 1.27 ft³ ported
- SPL Dynamics PRO-300D4 1.02 ft³ sealed · 1.20 ft³ ported
- Pioneer TS-W307D4 1.06 ft³ sealed · 1.17 ft³ ported
- Machete M12 D2 Sport 0.99 ft³ sealed · 1.20 ft³ ported
- Alpine SWS-12D4 (Type-S) 1.55 ft³ sealed · 1.24 ft³ ported
- Skar Audio VD-12 D2 1.31 ft³ sealed · 1.77 ft³ ported
FAQ
What box does the Soundstream T7.124 need?
Recommended net volume: 1.27 ft³ sealed, 1.27 ft³ ported tuned to 34 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 T7.124 Thiele/Small specs?
Fs 34.2 Hz, Qts 0.55, Vas 1.45 ft³, Xmax 0.59″, Sd 79.8 in².
What is the Soundstream T7.124 mounting depth?
Mounting depth is 6 5/8″, 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 T7.124 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.