Cadence S2W8D4
8″ subwoofer · dual 4 Ω · 500 W RMS
Fs 39.2 HzQts 0.50Vas 0.33 ft³Xmax 0.59″
Recommended box
For a sedan, one sub, 500 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 | 0.32 ft³ (9 L) |
|---|---|
| Qtc | 0.71 |
| Fc | 56 Hz |
| F3 (−3 dB, no cabin gain) | 58 Hz |
| Example box (outside) | 10 5/8″ × 10 5/8″ × 8 5/8″ |
Ported
| Net volume | 0.67 ft³ (19 L) |
|---|---|
| Tuning (Fb) | 34 Hz |
| Port | round port Ø2 1/2″, 15 5/16″ long |
| Port velocity at 500 W | 207 ft/s |
| F3 (−3 dB, no cabin gain) | 31 Hz |
| Example box (outside) | 21 9/16″ × 15 3/4″ × 6 1/8″ |
Thiele/Small parameters
| Fs | 39.2 Hz |
|---|---|
| Qts | 0.50 |
| Qes | 0.542 |
| Qms | 6 |
| Vas | 0.33 ft³ |
| Re (one coil) | ≈ 3.4 Ω |
| Sd | ≈ 33.3 in² |
| Xmax | 0.59″ |
| EBP | 72 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 82.2 dB calc. |
General
| Size | 8″ |
|---|---|
| Voice coils | dual 4 Ω |
| RMS power | 500 W |
Mounting dimensions
| Cutout diameter | ≈ 7 5/16″ |
|---|---|
| Mounting depth | 3 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
Other Cadence 8″ models
- Cadence S1W8D4.v2 8″ · dual 4 Ω
- Cadence S2W8D2 8″ · dual 2 Ω