Magnum MEW 18-22DC
18″ subwoofer · dual 2 Ω · 3,000 W RMS
Fs 28 HzQts 0.45Vas 3.93 ft³
Recommended box
For a sedan, one sub, 3,000 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 | 2.14 ft³ (60.5 L) |
|---|---|
| Qtc | 0.76 |
| Fc | 47 Hz |
| F3 (−3 dB, no cabin gain) | 47 Hz |
| Example box (outside) | 20 1/16″ × 20 1/16″ × 13 7/16″ |
Ported
| Net volume | 5.93 ft³ (168 L) |
|---|---|
| Tuning (Fb) | 27 Hz |
| Port | slot 5 1/8 × 19 7/16″, 53 1/4″ long |
| Port velocity at 3,000 W | 64 ft/s |
| F3 (−3 dB, no cabin gain) | 25 Hz |
| Example box (outside) | 31 1/2″ × 20 7/8″ × 29 11/16″ |
Thiele/Small parameters
| Fs | 28 Hz |
|---|---|
| Qts | 0.45 |
| Qes | 0.486 |
| Qms | 6 |
| Vas | 3.93 ft³ |
| Re (one coil) | ≈ 1.7 Ω |
| Sd | ≈ 180.6 in² |
| Xmax | ≈ 0.39″ |
| EBP | 58 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 89 dB calc. |
General
| Size | 18″ |
|---|---|
| Voice coils | dual 2 Ω |
| RMS power | 3,000 W |
Mounting dimensions
| Cutout diameter | 16 7/8″ |
|---|---|
| Mounting depth | 10 15/16″ |
| Overall diameter | 18 1/2″ |
Only Qts is published — Qms assumed to be 6 and Qes calculated (barely affects box design).
“≈” 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.