Audioque HDC418-D1-A
18″ subwoofer · dual 1 Ω · 2,000 W RMS
Fs 40.4 HzQts 0.44Vas 1.71 ft³
Recommended box
For a sedan, one sub, 2,000 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 | 1.80 ft³ (51 L) |
|---|---|
| Qtc | 0.62 |
| Fc | 56 Hz |
| F3 (−3 dB, no cabin gain) | 68 Hz |
| Example box (outside) | 19 11/16″ × 19 11/16″ × 12 3/16″ |
Ported
| Net volume | 3.00 ft³ (85 L) |
|---|---|
| Tuning (Fb) | 36 Hz |
| Port | slot 3 3/4 × 19 1/16″, 42″ long |
| Port velocity at 2,000 W | 62 ft/s |
| F3 (−3 dB, no cabin gain) | 33 Hz |
| Example box (outside) | 31 1/2″ × 20 1/2″ × 17 1/4″ |
Thiele/Small parameters
| Fs | 40.4 Hz |
|---|---|
| Qts | 0.44 |
| Qes | 0.478 |
| Qms | 6.05 |
| Vas | 1.71 ft³ |
| Re (one coil) | 0.91 Ω |
| Sd | 156.7 in² |
| Xmax | ≈ 0.39″ |
| Mms | 465 g calc. |
| BL | 15 T·m calc. |
| EBP | 84 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 90.2 dB calc. |
General
| Size | 18″ |
|---|---|
| Voice coils | dual 1 Ω |
| RMS power | 2,000 W |
Mounting dimensions
| Cutout diameter | ≈ 16 9/16″ |
|---|---|
| Mounting depth | 9 3/4″ |
| Magnet diameter | 10″ |
Judging by its value, the published Re is for both coils in series — 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
Other Audioque 18″ models
- Audioque HDC318-A D1 18″ · dual 1 Ω