Pioneer TS-W120S4
12″ subwoofer · 4 Ω · 400 W RMS
The Pioneer TS-W120S4 is a 12″ subwoofer. With Qts 0.75 and EBP 35 it suits a sealed box: tight bass in a small enclosure; a ported box would need a lot of volume. Modest excursion (Xmax 0.42″) — for clean sound at moderate levels, not for SPL competitions.
| Source | pioneer-car.eu · 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, 400 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 · 1.18 |
|---|---|
| Fc | 43 Hz |
| F3 (−3 dB, no cabin gain) | 33 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 9 1/16″ |
Ported
deeper, louder| Tuning (Fb) | 30 Hz |
|---|---|
| Port | slot 1 9/16 × 14 5/16″, 27 3/16″ long |
| Port velocity at 400 W | 50 ft/s |
| F3 (−3 dB, no cabin gain) | 29 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 12 7/16″ |
Deeper: 3.07 ft³ (87 L) tuned to 33 Hz, 31 1/2″ × 15 3/4″ × 15 3/8″ 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 | 4 Ω |
| RMS power | 400 W |
| Fs | 27 Hz |
| Qts | 0.75 |
| Qes | 0.78 |
| Qms | 17.56 |
| Vas | 2.68 ft³ |
| Re | 4.5 Ω |
|---|---|
| Sd | 79.8 in² |
| Xmax | 0.42″ |
| Vd | 33.6 in³ calc. |
| Mms | 172 g calc. |
| BL | 13 T·m calc. |
| EBP | 35 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 84.8 dB calc. |
Mounting dimensions
| Cutout diameter | 11 1/16″ |
|---|---|
| Mounting depth | 5 13/16″ |
| Overall diameter | 12 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 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
Voice coil versions
The same sub with different voice coils: the parameters are nearly the same — pick by your amp and wiring.
| Model | Voice coils | Re | Qes | Vas | Sealed | Ported |
|---|---|---|---|---|---|---|
| Pioneer TS-W120S4 | 4 Ω | 4.5 Ω | 0.78 | 2.68 ft³ | 1.80 ft³ | 2.15 ft³ · 30 Hz |
| Pioneer TS-W120D4 | dual 4 Ω | 4.5 Ω | 0.73 | 2.84 ft³ | 1.80 ft³ | 2.26 ft³ · 30 Hz |
Other Pioneer 12″ models
- Pioneer TS-300D4 12″ · dual 4 Ω
- Pioneer TS-300S4 12″ · 4 Ω
- Pioneer TS-A30S4 12″ · 4 Ω
- Pioneer TS-A120D4 12″ · dual 4 Ω
- Pioneer TS-A120S4E 12″ · 4 Ω
- Pioneer TS-A300D4 12″ · dual 4 Ω
- Pioneer TS-A301D4 12″ · dual 4 Ω
- Pioneer TS-A301S4 12″ · 4 Ω
- Pioneer TS-A3000LS4 12″ · 4 Ω
- Pioneer TS-D12D2 12″ · dual 2 Ω
- Pioneer TS-D12D4 12″ · dual 4 Ω
- Pioneer TS-SW3002S4 12″ · 4 Ω
Similar 12″ subwoofers from other brands
Close in Fs, Qts and Vas — a box of similar volume will suit them.
- Polk Audio dX12-8 1.80 ft³ sealed · 2.37 ft³ ported
- Soundstream PXW-12 1.70 ft³ sealed · 2.22 ft³ ported
- BOSS Audio PD12LED 1.73 ft³ sealed · 2.05 ft³ ported
- Kicker CompC 12" 4-Ohm SVC (44CWCS124) 1.87 ft³ sealed · 2.01 ft³ ported
- Soundstream PXW-12/2 1.70 ft³ sealed · 1.98 ft³ ported
- Kicker CompC 12" 4-Ohm SVC (50CWCS124) 1.87 ft³ sealed · 2.01 ft³ ported
FAQ
What box does the Pioneer TS-W120S4 need?
Recommended net volume: 1.80 ft³ sealed, 2.15 ft³ ported tuned to 30 Hz — for one sub in a sedan at 400 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.
What are the Pioneer TS-W120S4 Thiele/Small specs?
Fs 27 Hz, Qts 0.75, Vas 2.68 ft³, Xmax 0.42″, Sd 79.8 in².
What is the Pioneer TS-W120S4 mounting depth?
Mounting depth is 5 13/16″, cutout diameter 11 1/16″. The inside depth of the box must exceed the mounting depth by at least 1″.
How much power does the Pioneer TS-W120S4 handle and how do I wire it?
RMS power rating: 400 W. Wiring for several subs and amp power — in the wiring calculator.
Is the Pioneer TS-W120S4 better sealed or ported?
EBP 35: a sealed box (1.80 ft³) suits it best — tight bass in a compact enclosure. Ported is possible (2.15 ft³, tuned to 30 Hz) but larger.
What port does the Pioneer TS-W120S4 need?
For the 2.15 ft³ ported box tuned to 30 Hz: slot 1 9/16 × 14 5/16″, 27 3/16″ long, area 22.6 in²; or a round port Ø5 3/8″, ≈ 27 3/16″ long. Port air speed at 400 W: 50 ft/s.
What box do two Pioneer TS-W120S4 subs need?
Two subs need twice the volume: 3.60 ft³ sealed, or 4.31 ft³ ported at the same 30 Hz tuning with twice the port area. One shared chamber or one per sub — whatever fits your vehicle.