JL Audio 8W1v2-4

8″ subwoofer · 4 Ω · 150 W RMS · also as 8W1v2-8 (8 Ω)

Specs
34.6 HzFs
0.47Qts
0.66 ft³Vas
0.31″Xmax
All Thiele/Small parameters ↓
Weight & fit
3 7/8″Mounting depth
7 1/16″Cutout
150 WRMS · 4 Ω
Mounting drawing ↓
Box size
0.35 ft³ sealedoutside 10 1/4″ × 10 1/4″ × 10 1/16″ · F3 56 Hz
0.53 ft³ ported, 42 Hz16 3/8″ × 15 3/4″ × 6 5/16″ · port: round port Ø2 1/2″, 12 7/16″ long
Box details and plans ↓

The JL Audio 8W1v2-4 is a 8″ subwoofer. With Qts 0.47 and EBP 68 it works both sealed and ported: sealed is tighter and smaller, ported is deeper and louder.

Open ported box in designerOpen sealed box in designer
Sourceweb.archive.org · manufacturer data
Checked against sourceOctober 2026
Thiele/Small parameterscomplete
Mounting dimensions3 of 4 — missing: magnet diameter; the designer will use an estimate

Recommended box

For a sedan, one sub, 150 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
0.35 ft³ (10 L)
Net volume
Bass character (Qtc)Tight and punchy · 0.80
Fc59 Hz
F3 (−3 dB, no cabin gain)56 Hz
Example box (outside)10 1/4″ × 10 1/4″ × 10 1/16″
Open sealed box in designer

Ported

deeper, louder
0.53 ft³ (15 L)
Net volume
Tuning (Fb)42 Hz
Portround port Ø2 1/2″, 12 7/16″ long
Port velocity at 150 W95 ft/s
F3 (−3 dB, no cabin gain)40 Hz
Example box (outside)16 3/8″ × 15 3/4″ × 6 5/16″

At 150 W this example’s port will be noisy: air speed 95 ft/s, while the limit is 82 ft/s. It stays quiet up to about 110 W. Full power needs a port of at least 5.8 in², which means a bigger box than this example — size it in the designer.

Open ported box in designer

Deeper: 1.13 ft³ (32 L) tuned to 32 Hz, 31 1/2″ × 15 3/4″ × 8 3/16″ outside — a bigger box with flatter deep bass. Open in the calculator

Where to buy Amazon
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Size8″
Voice coils4 Ω
RMS power150 W
Fs34.6 Hz
Qts0.47
Qes0.508
Qms6.26
Vas0.66 ft³
Re4 Ω
Sd32.7 in²
Xmax0.31″
Vd10.3 in³ calc.
Mms71 g calc.
BL11 T·m calc.
EBP68 — sealed or ported calc.
Sensitivity, 1 W / 1 m83.8 dB calc.

Mounting dimensions

Ø8 9/16″cutout Ø7 1/16″mounting depth 3 7/8″magnet Ø≈ 4 5/8″
Cutout diameter7 1/16″
Mounting depth3 7/8″
Overall diameter8 9/16″

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.

“≈” 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.

ModelVoice coilsReQesVasSealedPorted
JL Audio 8W1v2-44 Ω4 Ω0.5080.66 ft³0.35 ft³0.53 ft³ · 42 Hz
JL Audio 8W1v2-88 Ω7.84 Ω0.6120.63 ft³0.60 ft³0.53 ft³ · 44 Hz

Other JL Audio 8″ models

Similar 8″ subwoofers from other brands

Close in Fs, Qts and Vas — a box of similar volume will suit them.

All 8″ subwoofers in our database →

FAQ

What box does the JL Audio 8W1v2-4 need?

Recommended net volume: 0.35 ft³ sealed, 0.53 ft³ ported tuned to 42 Hz — for one sub in a sedan at 150 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.

What are the JL Audio 8W1v2-4 Thiele/Small specs?

Fs 34.6 Hz, Qts 0.47, Vas 0.66 ft³, Xmax 0.31″, Sd 32.7 in².

What is the JL Audio 8W1v2-4 mounting depth?

Mounting depth is 3 7/8″, cutout diameter 7 1/16″. The inside depth of the box must exceed the mounting depth by at least 1″.

How much power does the JL Audio 8W1v2-4 handle and how do I wire it?

RMS power rating: 150 W. Wiring for several subs and amp power — in the wiring calculator.

Is the JL Audio 8W1v2-4 better sealed or ported?

EBP 68: both work — sealed 0.35 ft³ is tighter and smaller, ported 0.53 ft³ tuned to 42 Hz is deeper and louder.

What port does the JL Audio 8W1v2-4 need?

For the 0.53 ft³ ported box tuned to 42 Hz: round port Ø2 1/2″, 12 7/16″ long, area 5 in². Port air speed at 150 W: 95 ft/s.

What box do two JL Audio 8W1v2-4 subs need?

Two subs need twice the volume: 0.71 ft³ sealed, or 1.06 ft³ ported at the same 42 Hz tuning with twice the port area. One shared chamber or one per sub — whatever fits your vehicle.