Skar Audio SDR-8 D2
8″ subwoofer · dual 2 Ω · 350 W RMS
Fs 39 HzQts 0.45Vas 0.25 ft³Xmax 0.35″
The published specs don’t add up:
- Fs, Vas and Sd don't match the moving mass of 89.2 g (they give 136 g) — one of the spec sheet values is probably wrong.
Recommended box
For a sedan, one sub, 350 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 | 0.28 ft³ (8 L) |
|---|---|
| Qtc | 0.62 |
| Fc | 53 Hz |
| F3 (−3 dB, no cabin gain) | 65 Hz |
| Example box (outside) | 10 1/4″ × 10 1/4″ × 8 1/2″ |
Ported
| Net volume | 0.60 ft³ (17 L) |
|---|---|
| Tuning (Fb) | 39 Hz |
| Port | round port Ø2 1/2″, 12 3/4″ long |
| Port velocity at 350 W | 182 ft/s |
| F3 (−3 dB, no cabin gain) | 34 Hz |
| Example box (outside) | 15 13/16″ × 15 3/4″ × 7 1/16″ |
Thiele/Small parameters
| Fs | 39 Hz |
|---|---|
| Qts | 0.45 |
| Qes | 0.5 |
| Qms | 4.59 |
| Vas | 0.25 ft³ |
| Re (one coil) | ≈ 1.7 Ω |
| Sd | 31.2 in² |
| Xmax | 0.35″ |
| Vd | 10.8 in³ calc. |
| Mms | 136 g calc. |
| BL | 10.7 T·m calc. |
| EBP | 78 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 81.2 dB calc. |
General
| Size | 8″ |
|---|---|
| Voice coils | dual 2 Ω |
| RMS power | 350 W |
Mounting dimensions
| Cutout diameter | 7 3/16″ |
|---|---|
| Mounting depth | 4 11/16″ |
| Overall diameter | 8 7/16″ |
| Magnet diameter | 5 1/4″ |
“≈” 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 Skar Audio 8″ models
- Skar Audio EVL-8 D2 8″ · dual 2 Ω
- Skar Audio EVL-8 D4 8″ · dual 4 Ω
- Skar Audio SDR-8 D4 8″ · dual 4 Ω
- Skar Audio SVR-8 D2 8″ · dual 2 Ω
- Skar Audio SVR-8 D4 8″ · dual 4 Ω
- Skar Audio VD-8 D2 8″ · dual 2 Ω
- Skar Audio VD-8 D4 8″ · dual 4 Ω
- Skar Audio ZVX-8 D2 8″ · dual 2 Ω
- Skar Audio ZVX-8 D4 8″ · dual 4 Ω