JL Audio 12W1v2-4
12″ subwoofer · 4 Ω · 300 W RMS · also as 12W1v2-8 (8 Ω)
The JL Audio 12W1v2-4 is a 12″ subwoofer. With Qts 0.41 and EBP 53 it works both sealed and ported: sealed is tighter and smaller, ported is deeper and louder. Modest excursion (Xmax 0.37″) — for clean sound at moderate levels, not for SPL competitions.
| 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, 300 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 | 46 Hz |
| F3 (−3 dB, no cabin gain) | 44 Hz |
| Example box (outside) | 14 3/16″ × 14 3/16″ × 17 3/16″ |
Ported
deeper, louder| Tuning (Fb) | 30 Hz |
|---|---|
| Port | slot 1 9/16 × 14 5/16″, 24″ long |
| Port velocity at 300 W | 53 ft/s |
| F3 (−3 dB, no cabin gain) | 29 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 13 3/16″ |
Deeper: 3.14 ft³ (89 L) tuned to 28 Hz, 31 1/2″ × 15 3/4″ × 15 7/8″ 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 | 300 W |
| Fs | 23.7 Hz |
| Qts | 0.41 |
| Qes | 0.443 |
| Qms | 6.47 |
| Vas | 3.74 ft³ |
| Re | 4.1 Ω |
|---|---|
| Sd | 81.4 in² |
| Xmax | 0.37″ |
| Vd | 30.4 in³ calc. |
| Mms | 167 g calc. |
| BL | 15.1 T·m calc. |
| EBP | 53 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 87 dB calc. |
Mounting dimensions
| Cutout diameter | 11 1/16″ |
|---|---|
| Mounting depth | 5 1/8″ |
| 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 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
- web.archive.org/web/20190724165110/http://www.jlaudio.com:80/12w1v2-4-car-audio-
- web.archive.org/web/20150924081013/http://mediacdn.jlaudio.com/media/mfg/9013/me
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 |
|---|---|---|---|---|---|---|
| JL Audio 12W1v2-4 | 4 Ω | 4.1 Ω | 0.443 | 3.74 ft³ | 1.38 ft³ | 2.40 ft³ · 30 Hz |
| JL Audio 12W1v2-8 | 8 Ω | 6.75 Ω | 0.493 | 3.54 ft³ | 1.73 ft³ | 2.40 ft³ · 30 Hz |
Other JL Audio 12″ models
- JL Audio 12TW1-2 12″ · 2 Ω
- JL Audio 12TW1-4 12″ · 4 Ω
- JL Audio 12TW3-D4 12″ · dual 4 Ω
- JL Audio 12TW3-D8 12″ · dual 8 Ω
- JL Audio 12W0-8 12″ · 8 Ω
- JL Audio 12W0v3-4 12″ · 4 Ω
- JL Audio 12W1-4 12″ · 4 Ω
- JL Audio 12W1-8 12″ · 8 Ω
- JL Audio 12W1v3-2 12″ · 2 Ω
- JL Audio 12W1v3-4 12″ · 4 Ω
- JL Audio 12W3v2-D2 12″ · dual 2 Ω
- JL Audio 12W3v2-D4 12″ · dual 4 Ω
Similar 12″ subwoofers from other brands
Close in Fs, Qts and Vas — a box of similar volume will suit them.
- Infinity Kappa Perfect 12.1 1.52 ft³ sealed · 2.44 ft³ ported
- JBL GTO1202D 1.52 ft³ sealed · 2.44 ft³ ported
- Diamond D122 1.52 ft³ sealed · 2.30 ft³ ported
- Morel Ultimo Titanium 124 (SVC 4 ohm) 1.66 ft³ sealed · 2.15 ft³ ported
- Pioneer TS-W12PRS 1.02 ft³ sealed · 2.08 ft³ ported
- ARC Audio Black 12D4 V2 1.17 ft³ sealed · 2.26 ft³ ported
All 12″ subwoofers in our database →
FAQ
What box does the JL Audio 12W1v2-4 need?
Recommended net volume: 1.38 ft³ sealed, 2.40 ft³ ported tuned to 30 Hz — for one sub in a sedan at 300 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.
What are the JL Audio 12W1v2-4 Thiele/Small specs?
Fs 23.7 Hz, Qts 0.41, Vas 3.74 ft³, Xmax 0.37″, Sd 81.4 in².
What is the JL Audio 12W1v2-4 mounting depth?
Mounting depth is 5 1/8″, 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 JL Audio 12W1v2-4 handle and how do I wire it?
RMS power rating: 300 W. Wiring for several subs and amp power — in the wiring calculator.
Is the JL Audio 12W1v2-4 better sealed or ported?
EBP 53: both work — sealed 1.38 ft³ is tighter and smaller, ported 2.40 ft³ tuned to 30 Hz is deeper and louder.
What port does the JL Audio 12W1v2-4 need?
For the 2.40 ft³ ported box tuned to 30 Hz: slot 1 9/16 × 14 5/16″, 24″ long, area 22.6 in²; or a round port Ø5 3/8″, ≈ 24″ long. Port air speed at 300 W: 53 ft/s.
What box do two JL Audio 12W1v2-4 subs need?
Two subs need twice the volume: 2.75 ft³ sealed, or 4.80 ft³ ported at the same 30 Hz tuning with twice the port area. One shared chamber or one per sub — whatever fits your vehicle.