RE Audio XXX18 D4 v2
18″ subwoofer · dual 4 Ω · 2,000 W RMS
Fs 28.9 HzQts 0.70Vas 3.40 ft³
Recommended box
For a sedan, one sub, 2,000 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 | 4.45 ft³ (126 L) |
|---|---|
| Qtc | 0.93 |
| Fc | 38 Hz |
| F3 (−3 dB, no cabin gain) | 33 Hz |
| Example box (outside) | 20 1/2″ × 20 1/2″ × 23 15/16″ |
Ported
| Net volume | 7.56 ft³ (214 L) |
|---|---|
| Tuning (Fb) | 27 Hz |
| Port | slot 4 1/2 × 19 13/16″, 35 3/4″ long |
| Port velocity at 2,000 W | 63 ft/s |
| F3 (−3 dB, no cabin gain) | 23 Hz |
| Example box (outside) | 31 1/2″ × 21 1/4″ × 30 1/8″ |
Thiele/Small parameters
| Fs | 28.9 Hz |
|---|---|
| Qts | 0.70 |
| Qes | 0.801 |
| Qms | 5.4 |
| Vas | 3.40 ft³ |
| Re (one coil) | 3.76 Ω |
| Sd | 194.8 in² |
| Xmax | ≈ 0.39″ |
| Mms | 702 g calc. |
| BL | 24.5 T·m calc. |
| EBP | 36 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 86.7 dB calc. |
General
| Size | 18″ |
|---|---|
| Voice coils | dual 4 Ω |
| RMS power | 2,000 W |
Mounting dimensions
| Cutout diameter | 17 3/8″ |
|---|---|
| Mounting depth | 14 3/4″ |
| Overall diameter | 19″ |
Judging by its value, the published Re is for both coils in parallel — 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
- reaudio.com/THIELESPDF/xxx18v2_info%20(1).pdf
- reaudio.com/products/woofers_xxx.php
- reaudio.com/Catalog_2017.pdf
- reaudio.com/products/BOX%20V2%20PDF/XXX%2018%20SEALED(1).pdf
Other RE Audio 18″ models
- RE Audio SX18 D2 18″ · dual 2 Ω
- RE Audio SX18 D4 18″ · dual 4 Ω