PowerBass S-1204D
12″ subwoofer · dual 4 Ω · 300 W RMS
Fs 31 HzQts 0.50Vas 2.29 ft³Xmax 0.37″
Recommended box
For a sedan, one sub, 300 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 | 1.45 ft³ (41 L) |
|---|---|
| Qtc | 0.80 |
| Fc | 50 Hz |
| F3 (−3 dB, no cabin gain) | 47 Hz |
| Example box (outside) | 14 15/16″ × 14 15/16″ × 16 1/16″ |
Ported
| Net volume | 3.07 ft³ (87 L) |
|---|---|
| Tuning (Fb) | 32 Hz |
| Port | slot 1 3/4 × 14 5/16″, 17 7/16″ long |
| Port velocity at 300 W | 59 ft/s |
| F3 (−3 dB, no cabin gain) | 29 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 15 1/2″ |
Thiele/Small parameters
| Fs | 31 Hz |
|---|---|
| Qts | 0.50 |
| Qes | 0.56 |
| Qms | 4.5 |
| Vas | 2.29 ft³ |
| Re (one coil) | 3.2 Ω |
| Sd | 79.2 in² |
| Xmax | 0.37″ |
| Vd | 29.6 in³ calc. |
| Mms | 150 g calc. |
| BL | 12.9 T·m calc. |
| EBP | 55 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 87.4 dB calc. |
General
| Size | 12″ |
|---|---|
| Voice coils | dual 4 Ω |
| RMS power | 300 W |
Mounting dimensions
| Cutout diameter | 11 11/16″ |
|---|---|
| Mounting depth | 5 1/2″ |
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/s-1204-d-12-subwoofer/
- powerbassusa.com/media/uploads_file/2017/07/06/a595eae4d820351.86234582.pdf
Other PowerBass 12″ models
- PowerBass 3XL-1201D 12″ · dual 1 Ω
- PowerBass 3XL-1210D 12″ · dual 1 Ω
- PowerBass L-1204D 12″ · dual 4 Ω
- PowerBass S-12T 12″ · 4 Ω