Soundstream TSQ-122
12″ subwoofer · dual 2 Ω · 650 W RMS
The Soundstream TSQ-122 is a 12″ subwoofer. With Qts 0.71 and EBP 44 it suits a sealed box: tight bass in a small enclosure; a ported box would need a lot of volume.
| Source | web.archive.org · manufacturer data |
|---|---|
| Checked against source | October 2026 |
| Thiele/Small parameters | not in the spec sheet: Sd — typical value for the size used |
| Mounting dimensions | 3 of 4 — missing: magnet diameter; the designer will use an estimate |
- Fs, Vas and Sd don't match the moving mass of 214 g (they give 114 g) — one of the spec sheet values is probably wrong.
Recommended box
For a sedan, one sub, 650 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 · 1.05 |
|---|---|
| Fc | 53 Hz |
| F3 (−3 dB, no cabin gain) | 43 Hz |
| Example box (outside) | 14 3/16″ × 14 3/16″ × 20 15/16″ |
Ported
deeper, louder| Tuning (Fb) | 34 Hz |
|---|---|
| Port | slot 1 9/16 × 14 5/16″, 28 3/16″ long |
| Port velocity at 650 W | 56 ft/s |
| F3 (−3 dB, no cabin gain) | 37 Hz |
| Example box (outside) | 21 15/16″ × 15 3/4″ × 14 9/16″ |
Deeper: 2.93 ft³ (83 L) tuned to 38 Hz, 31 1/2″ × 15 3/4″ × 15 1/8″ 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 2 Ω |
| RMS power | 650 W |
| Fs | 36.2 Hz |
| Qts | 0.71 |
| Qes | 0.828 |
| Qms | 5 |
| Vas | 2.03 ft³ |
|---|---|
| Re (one coil) | 2.05 Ω |
| Sd | ≈ 76 in² |
| Xmax | 0.59″ |
| EBP | 44 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 87.2 dB calc. |
Mounting dimensions
| Cutout (square, side) | 11 1/8″ |
|---|---|
| Mounting depth | 7 3/8″ |
| Overall diameter | 12 5/8″ |
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 R1-12 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.
- BOSS Audio D12F 1.73 ft³ sealed · 1.66 ft³ ported
- Rockville W12T4S2 1.94 ft³ sealed · 1.73 ft³ ported
- Ground Zero GZIW 300X (4 Ohm) 1.73 ft³ sealed · 1.52 ft³ ported
- Phoenix Gold SXT12D4 (slim, DVC 4 ohm) 1.80 ft³ sealed · 1.55 ft³ ported
- Blaupunkt BPW-HX120D (DVC 4+4 ohm) 1.73 ft³ sealed · 1.52 ft³ ported
- JBL MS-12SD2 1.80 ft³ sealed · 1.38 ft³ ported
FAQ
What box does the Soundstream TSQ-122 need?
Recommended net volume: 1.73 ft³ sealed, 1.62 ft³ ported tuned to 34 Hz — for one sub in a sedan at 650 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.
What are the Soundstream TSQ-122 Thiele/Small specs?
Fs 36.2 Hz, Qts 0.71, Vas 2.03 ft³, Xmax 0.59″.
What is the Soundstream TSQ-122 mounting depth?
Mounting depth is 7 3/8″, 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 TSQ-122 handle and how do I wire it?
RMS power rating: 650 W. Dual 2 Ω voice coils: series gives 4 Ω, parallel gives 1 Ω at the amp. Wiring for several subs and amp power — in the wiring calculator.
Is the Soundstream TSQ-122 better sealed or ported?
EBP 44: a sealed box (1.73 ft³) suits it best — tight bass in a compact enclosure. Ported is possible (1.62 ft³, tuned to 34 Hz) but larger.
What port does the Soundstream TSQ-122 need?
For the 1.62 ft³ ported box tuned to 34 Hz: slot 1 9/16 × 14 5/16″, 28 3/16″ long, area 22.6 in²; or a round port Ø5 3/8″, ≈ 28 3/16″ long. Port air speed at 650 W: 56 ft/s.
What box do two Soundstream TSQ-122 subs need?
Two subs need twice the volume: 3.46 ft³ sealed, or 3.25 ft³ ported at the same 34 Hz tuning with twice the port area. One shared chamber or one per sub — whatever fits your vehicle.