PowerBass L-1204D
12″ subwoofer · dual 4 Ω · 400 W RMS
Fs 30 HzQts 0.49Vas 2.14 ft³Xmax 0.43″
Recommended box
For a sedan, one sub, 400 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 | 1.27 ft³ (36 L) |
|---|---|
| Qtc | 0.80 |
| Fc | 49 Hz |
| F3 (−3 dB, no cabin gain) | 47 Hz |
| Example box (outside) | 14 15/16″ × 14 15/16″ × 14 3/8″ |
Ported
| Net volume | 2.93 ft³ (83 L) |
|---|---|
| Tuning (Fb) | 30 Hz |
| Port | slot 1 3/4 × 14 5/16″, 21 9/16″ long |
| Port velocity at 400 W | 65 ft/s |
| F3 (−3 dB, no cabin gain) | 27 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 15 1/4″ |
Thiele/Small parameters
| Fs | 30 Hz |
|---|---|
| Qts | 0.49 |
| Qes | 0.56 |
| Qms | 3.7 |
| Vas | 2.14 ft³ |
| Re (one coil) | 3.2 Ω |
| Sd | 76 in² |
| Xmax | 0.43″ |
| Vd | 32.9 in³ calc. |
| Mms | 158 g calc. |
| BL | 13 T·m calc. |
| EBP | 54 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 86.7 dB calc. |
General
| Size | 12″ |
|---|---|
| Voice coils | dual 4 Ω |
| RMS power | 400 W |
Mounting dimensions
| Cutout diameter | 11 11/16″ |
|---|---|
| Mounting depth | 5 3/8″ |
Judging by its value, the published Re is for both coils in parallel — converted to per coil.
“≈” 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
- powerbassusa.com/products/mobile-audio/l-1204d-12-subwoofer/
- powerbassusa.com/media/uploads_file/2017/07/06/a595eac6b849e81.82485947.pdf
Other PowerBass 12″ models
- PowerBass 3XL-1201D 12″ · dual 1 Ω
- PowerBass 3XL-1210D 12″ · dual 1 Ω
- PowerBass S-12T 12″ · 4 Ω
- PowerBass S-1204D 12″ · dual 4 Ω