DL Audio Phoenix Bass Machine 18 (2+2)
18″ subwoofer · dual 2 Ω · 1,700 W RMS
Fs 23.2 HzQts 0.68Vas 5.37 ft³
Recommended box
For a sedan, one sub, 1,700 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 | 4.13 ft³ (117 L) |
|---|---|
| Qtc | 1.03 |
| Fc | 35 Hz |
| F3 (−3 dB, no cabin gain) | 29 Hz |
| Example box (outside) | 31 1/2″ × 20 1/2″ × 14 3/4″ |
Ported
| Net volume | 6.99 ft³ (198 L) |
|---|---|
| Tuning (Fb) | 27 Hz |
| Port | slot 3 3/4 × 19 1/16″, 30 3/8″ long |
| Port velocity at 1,700 W | 65 ft/s |
| F3 (−3 dB, no cabin gain) | 23 Hz |
| Example box (outside) | 31 1/2″ × 20 1/2″ × 27 5/8″ |
Thiele/Small parameters
| Fs | 23.2 Hz |
|---|---|
| Qts | 0.68 |
| Qes | 0.767 |
| Qms | 6 |
| Vas | 5.37 ft³ |
| Re (one coil) | ≈ 1.7 Ω |
| Sd | ≈ 180.6 in² |
| Xmax | ≈ 0.39″ |
| EBP | 30 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 85.9 dB calc. |
General
| Size | 18″ |
|---|---|
| Voice coils | dual 2 Ω |
| RMS power | 1,700 W |
Mounting dimensions
| Cutout diameter | 16 5/8″ |
|---|---|
| Mounting depth | 9 9/16″ |
| Overall diameter | 18 7/16″ |
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 DL Audio 18″ models
- DL Audio Phoenix Black Bass 18 (2+2) 18″ · dual 2 Ω
- DL Audio Raven 18 (2+2) 18″ · dual 2 Ω