Ground Zero GZNW 18XSPL (2x1 Ohm)
18″ subwoofer · dual 1 Ω
Fs 31.3 HzQts 0.58Vas 4.93 ft³Xmax 0.98″
Recommended box
For a sedan, one sub, 300 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 | 4.27 ft³ (121 L) |
|---|---|
| Qtc | 0.85 |
| Fc | 46 Hz |
| F3 (−3 dB, no cabin gain) | 41 Hz |
| Example box (outside) | 31 1/2″ × 20 7/8″ × 14 7/8″ |
Ported
| Net volume | 7.27 ft³ (206 L) |
|---|---|
| Tuning (Fb) | 32 Hz |
| Port | slot 1 15/16 × 19 7/16″, 8 5/8″ long |
| Port velocity at 300 W | 60 ft/s |
| F3 (−3 dB, no cabin gain) | 28 Hz |
| Example box (outside) | 31 1/2″ × 20 7/8″ × 24 7/16″ |
Thiele/Small parameters
| Fs | 31.3 Hz |
|---|---|
| Qts | 0.58 |
| Qes | 0.64 |
| Qms | 6 |
| Vas | 4.93 ft³ |
| Re (one coil) | 1.15 Ω |
| Sd | 188 in² |
| Xmax | 0.98″ |
| Vd | 185 in³ calc. |
| Mms | 386 g calc. |
| BL | 11.7 T·m calc. |
| EBP | 49 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 90.3 dB calc. |
General
| Size | 18″ |
|---|---|
| Voice coils | dual 1 Ω |
| RMS power | — |
Mounting dimensions
| Cutout diameter | 16 3/4″ |
|---|---|
| Mounting depth | 11 1/4″ |
| Overall diameter | 18 5/16″ |
Cone area (Sd) calculated from Fs, Vas and Mms: 188 in².
“≈” 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
- ground-zero-audio.com/wp-content/uploads/GZNW-XSPL_OM_072014.pdf
- web.archive.org/web/20151109041244/http://www.ground-zero-audio.com:80/en/produc
Other Ground Zero 18″ models
- Ground Zero GZHW 18XSPL-D1 (2x1 Ohm) 18″ · dual 1 Ω
- Ground Zero GZPW 18SPL (2x1 Ohm) 18″ · dual 1 Ω
- Ground Zero GZPW 18SPL-EXTREME (2x1 Ohm) 18″ · dual 1 Ω