Ascendant Audio Havoc 18 D2
18″ subwoofer · dual 2 Ω · 2,750 W RMS
Fs 28 HzQts 0.56Vas 4.87 ft³Xmax 1.30″
Recommended box
For a sedan, one sub, 2,750 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 | 4.27 ft³ (121 L) |
|---|---|
| Qtc | 0.81 |
| Fc | 41 Hz |
| F3 (−3 dB, no cabin gain) | 38 Hz |
| Example box (outside) | 31 1/2″ × 20 1/2″ × 15 1/8″ |
Ported
| Net volume | 7.27 ft³ (206 L) |
|---|---|
| Tuning (Fb) | 29 Hz |
| Port | slot 5 1/2 × 19 1/16″, 37 7/16″ long |
| Port velocity at 2,750 W | 65 ft/s |
| F3 (−3 dB, no cabin gain) | 26 Hz |
| Example box (outside) | 31 1/2″ × 20 1/2″ × 31 5/8″ |
Thiele/Small parameters
| Fs | 28 Hz |
|---|---|
| Qts | 0.56 |
| Qes | 0.611 |
| Qms | 6.12 |
| Vas | 4.87 ft³ |
| Re (one coil) | 2 Ω |
| Sd | 187.6 in² |
| Xmax | 1.30″ |
| Vd | 243.7 in³ calc. |
| Mms | 485 g calc. |
| BL | 16.7 T·m calc. |
| EBP | 46 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 89 dB calc. |
General
| Size | 18″ |
|---|---|
| Voice coils | dual 2 Ω |
| RMS power | 2,750 W |
Mounting dimensions
| Cutout diameter | ≈ 16 9/16″ |
|---|---|
| Mounting depth | ≈ 8 1/4″ |
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 Ascendant Audio 18″ models
- Ascendant Audio Havoc 18 D1 18″ · dual 1 Ω
- Ascendant Audio Mayhem 18 D1 18″ · dual 1 Ω
- Ascendant Audio Mayhem 18 D2 18″ · dual 2 Ω