Power Acoustik GW3-15
15″ subwoofer · dual 2 Ω
Fs 31.2 HzQts 0.99Vas 2.52 ft³
The published specs don’t add up:
- Fs, Vas and Sd don't match the moving mass of 673.0175 g (they give 331 g) — one of the spec sheet values is probably wrong.
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 | 2.83 ft³ (80 L) |
|---|---|
| Qtc | 1.37 |
| Fc | 43 Hz |
| F3 (−3 dB, no cabin gain) | 32 Hz |
| Example box (outside) | 31 1/2″ × 18 1/2″ × 11 1/2″ |
Ported
| Net volume | 4.80 ft³ (136 L) |
|---|---|
| Tuning (Fb) | 33 Hz |
| Port | slot 1 9/16 × 17 1/16″, 9 7/16″ long |
| Port velocity at 300 W | 62 ft/s |
| F3 (−3 dB, no cabin gain) | 26 Hz |
| Example box (outside) | 31 1/2″ × 18 1/2″ × 18 13/16″ |
Thiele/Small parameters
| Fs | 31.2 Hz |
|---|---|
| Qts | 0.99 |
| Qes | 1.274 |
| Qms | 4.53 |
| Vas | 2.52 ft³ |
| Re (one coil) | 2.18 Ω |
| Sd | ≈ 124 in² |
| Xmax | ≈ 0.39″ |
| EBP | 24 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 84.3 dB calc. |
General
| Size | 15″ |
|---|---|
| Voice coils | dual 2 Ω |
| RMS power | — |
Mounting dimensions
| Cutout diameter | 14 1/2″ |
|---|---|
| Mounting depth | 7 1/2″ |
The spec sheet's Sd of 176.7 in² is the area of a 15″ circle, not the cone's radiating area — not used.
“≈” 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 Power Acoustik 15″ models
- Power Acoustik MOFO-152X 15″ · dual 2 Ω
- Power Acoustik MOFO-154X 15″ · dual 4 Ω