B2 Audio XM18v2 D1
18″ subwoofer · dual 1 Ω · 3,000 W RMS
Fs 33.3 HzQts 0.67Vas 2.33 ft³Xmax 1.18″
Recommended box
For a sedan, one sub, 3,000 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 | 4.13 ft³ (117 L) |
|---|---|
| Qtc | 0.84 |
| Fc | 42 Hz |
| F3 (−3 dB, no cabin gain) | 37 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 5 11/16 × 19 1/16″, 48 7/16″ long |
| Port velocity at 3,000 W | 65 ft/s |
| F3 (−3 dB, no cabin gain) | 23 Hz |
| Example box (outside) | 31 1/2″ × 20 1/2″ × 33 3/8″ |
Thiele/Small parameters
| Fs | 33.3 Hz |
|---|---|
| Qts | 0.67 |
| Qes | 0.77 |
| Qms | 5.15 |
| Vas | 2.33 ft³ |
| Re (one coil) | 0.7 Ω |
| Sd | ≈ 180.6 in² |
| Xmax | 1.18″ |
| EBP | 43 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 87 dB calc. |
General
| Size | 18″ |
|---|---|
| Voice coils | dual 1 Ω |
| RMS power | 3,000 W |
Mounting dimensions
| Cutout diameter | ≈ 16 9/16″ |
|---|---|
| Mounting depth | ≈ 8 1/4″ |
| Overall diameter | 18 7/16″ |
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 B2 Audio 18″ models
- B2 Audio HNx18v3 D2 18″ · dual 2 Ω
- B2 Audio ISx18 D1 18″ · dual 1 Ω