Ascendant Audio Mayhem 18 D1
18″ subwoofer · dual 1 Ω · 4,500 W RMS
Fs 35.4 HzQts 0.48Vas 2.35 ft³Xmax 1.42″
Recommended box
For a sedan, one sub, 4,500 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 | 1.70 ft³ (48 L) |
|---|---|
| Qtc | 0.74 |
| Fc | 55 Hz |
| F3 (−3 dB, no cabin gain) | 55 Hz |
| Example box (outside) | 19 11/16″ × 19 11/16″ × 11 11/16″ |
Ported
| Net volume | 4.27 ft³ (121 L) |
|---|---|
| Tuning (Fb) | 32 Hz |
| Port | round port Ø5″, 8 5/16″ long |
| Port velocity at 4,500 W | 375 ft/s |
| F3 (−3 dB, no cabin gain) | 29 Hz |
| Example box (outside) | 31 1/2″ × 20 1/2″ × 15 7/16″ |
Thiele/Small parameters
| Fs | 35.4 Hz |
|---|---|
| Qts | 0.48 |
| Qes | 0.523 |
| Qms | 5.7 |
| Vas | 2.35 ft³ |
| Re (one coil) | 0.79 Ω |
| Sd | 187.6 in² |
| Xmax | 1.42″ |
| Vd | 265.8 in³ calc. |
| Mms | 631 g calc. |
| BL | 14.6 T·m calc. |
| EBP | 68 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 89.5 dB calc. |
General
| Size | 18″ |
|---|---|
| Voice coils | dual 1 Ω |
| RMS power | 4,500 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 Havoc 18 D2 18″ · dual 2 Ω
- Ascendant Audio Mayhem 18 D2 18″ · dual 2 Ω