DS18 SLC-8S
8″ subwoofer · 4 Ω · 200 W RMS
Fs 50 HzQts 0.79Vas 0.28 ft³Xmax 0.53″
The published specs don’t add up:
- Fs, Vas and Sd don't match the moving mass of 115.524 g (they give 75 g) — one of the spec sheet values is probably wrong.
Recommended box
For a sedan, one sub, 200 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 | 0.57 ft³ (16 L) |
|---|---|
| Qtc | 0.96 |
| Fc | 61 Hz |
| F3 (−3 dB, no cabin gain) | 50 Hz |
| Example box (outside) | 10 1/4″ × 10 1/4″ × 14 3/4″ |
Ported
| Net volume | 1.20 ft³ (34 L) |
|---|---|
| Tuning (Fb) | 35 Hz |
| Port | slot 1 9/16 × 14 5/16″, 37 1/16″ long |
| Port velocity at 200 W | 41 ft/s |
| F3 (−3 dB, no cabin gain) | 30 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 9″ |
Thiele/Small parameters
| Fs | 50 Hz |
|---|---|
| Qts | 0.79 |
| Qes | 0.889 |
| Qms | 6.88 |
| Vas | 0.28 ft³ |
| Re | 3.4 Ω |
| Sd | 31.2 in² |
| Xmax | 0.53″ |
| Vd | 16.6 in³ calc. |
| Mms | 75 g calc. |
| BL | 9.5 T·m calc. |
| EBP | 56 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 82.4 dB calc. |
General
| Size | 8″ |
|---|---|
| Voice coils | 4 Ω |
| RMS power | 200 W |
Mounting dimensions
| Cutout diameter | 7 3/16″ |
|---|---|
| Mounting depth | 3 7/8″ |
| Overall diameter | 8 7/16″ |
“≈” 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.