Magnum MBW 12-24SF
12″ subwoofer · dual 4 Ω · 700 W RMS
Fs 31 HzQts 0.41Vas 2.07 ft³
Recommended box
For a sedan, one sub, 700 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 | 0.74 ft³ (21 L) |
|---|---|
| Qtc | 0.80 |
| Fc | 60 Hz |
| F3 (−3 dB, no cabin gain) | 58 Hz |
| Example box (outside) | 14 3/16″ × 14 3/16″ × 10 7/16″ |
Ported
| Net volume | 2.40 ft³ (68 L) |
|---|---|
| Tuning (Fb) | 32 Hz |
| Port | slot 2 3/8 × 14 5/16″, 32″ long |
| Port velocity at 700 W | 62 ft/s |
| F3 (−3 dB, no cabin gain) | 30 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 14 9/16″ |
Thiele/Small parameters
| Fs | 31 Hz |
|---|---|
| Qts | 0.41 |
| Qes | 0.44 |
| Qms | 6 |
| Vas | 2.07 ft³ |
| Re (one coil) | ≈ 3.4 Ω |
| Sd | ≈ 76 in² |
| Xmax | ≈ 0.39″ |
| EBP | 70 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 88 dB calc. |
General
| Size | 12″ |
|---|---|
| Voice coils | dual 4 Ω |
| RMS power | 700 W |
Mounting dimensions
| Cutout diameter | 11 1/8″ |
|---|---|
| Mounting depth | 6 1/16″ |
| Overall diameter | 12 11/16″ |
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.
Data sources
- magnummobile.ru/product/magnum-mbw-12-24sf
- magnummobile.ru/sites/default/files/docs/instrukciya_magnum_mbw_12-22_24sf_0.pdf
Other Magnum 12″ models
- Magnum MBW 12-22SF 12″ · dual 2 Ω
- Magnum MEW 12-22DC 12″ · dual 2 Ω
- Magnum MHW 12-22DCLE 12″ · dual 2 Ω
- Magnum MXW 12-22DC 12″ · dual 2 Ω