Skar Audio EVL-18 D4
18″ subwoofer · dual 4 Ω · 1,250 W RMS
Fs 32.6 HzQts 0.49Vas 2.75 ft³Xmax 0.93″
The published specs don’t add up:
- Fs, Vas and Sd don't match the moving mass of 429 g (they give 587 g) — one of the spec sheet values is probably wrong.
Recommended box
For a sedan, one sub, 1,250 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
| Net volume | 2.00 ft³ (56.5 L) |
|---|---|
| Qtc | 0.76 |
| Fc | 50 Hz |
| F3 (−3 dB, no cabin gain) | 50 Hz |
| Example box (outside) | 20 1/16″ × 20 1/16″ × 12 3/4″ |
Ported
| Net volume | 5.37 ft³ (152 L) |
|---|---|
| Tuning (Fb) | 29 Hz |
| Port | slot 3 3/8 × 19 7/16″, 31 7/8″ long |
| Port velocity at 1,250 W | 65 ft/s |
| F3 (−3 dB, no cabin gain) | 26 Hz |
| Example box (outside) | 31 1/2″ × 20 7/8″ × 22 3/16″ |
Thiele/Small parameters
| Fs | 32.6 Hz |
|---|---|
| Qts | 0.49 |
| Qes | 0.54 |
| Qms | 5.41 |
| Vas | 2.75 ft³ |
| Re (one coil) | ≈ 3.4 Ω |
| Sd | 180.4 in² |
| Xmax | 0.93″ |
| Vd | 166.9 in³ calc. |
| Mms | 587 g calc. |
| BL | 27.5 T·m calc. |
| EBP | 60 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 89 dB calc. |
General
| Size | 18″ |
|---|---|
| Voice coils | dual 4 Ω |
| RMS power | 1,250 W |
Mounting dimensions
| Cutout diameter | 16 3/4″ |
|---|---|
| Mounting depth | 10 1/4″ |
| Overall diameter | 18 5/16″ |
| Magnet diameter | 7 3/8″ |
“≈” 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 Skar Audio 18″ models
- Skar Audio EVL-18 D2 18″ · dual 2 Ω
- Skar Audio ZVX-18v2 D1 18″ · dual 1 Ω
- Skar Audio ZVX-18v2 D2 18″ · dual 2 Ω