Avatar Doomsday 18 D2
18″ subwoofer · dual 2 Ω · 3,500 W RMS
Fs 30 HzQts 0.49Vas 2.67 ft³Xmax 0.79″
Recommended box
For a sedan, one sub, 3,500 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 | 2.37 ft³ (67 L) |
|---|---|
| Qtc | 0.72 |
| Fc | 44 Hz |
| F3 (−3 dB, no cabin gain) | 45 Hz |
| Example box (outside) | 20 1/16″ × 20 1/16″ × 14 9/16″ |
Ported
| Net volume | 5.16 ft³ (146 L) |
|---|---|
| Tuning (Fb) | 27 Hz |
| Port | slot 5 5/16 × 19 7/16″, 65 1/8″ long |
| Port velocity at 3,500 W | 64 ft/s |
| F3 (−3 dB, no cabin gain) | 24 Hz |
| Example box (outside) | 31 1/2″ × 20 7/8″ × 30 1/8″ |
Thiele/Small parameters
| Fs | 30 Hz |
|---|---|
| Qts | 0.49 |
| Qes | 0.534 |
| Qms | 6 |
| Vas | 2.67 ft³ |
| Re (one coil) | ≈ 1.7 Ω |
| Sd | ≈ 180.6 in² |
| Xmax | 0.79″ |
| EBP | 56 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 87.8 dB calc. |
General
| Size | 18″ |
|---|---|
| Voice coils | dual 2 Ω |
| RMS power | 3,500 W |
Mounting dimensions
| Cutout diameter | 16 3/4″ |
|---|---|
| Mounting depth | 12 1/8″ |
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 Avatar 18″ models
- Avatar Doomsday 18 D1 18″ · dual 1 Ω