Ground Zero GZIW 165X-II (4 Ohm)
6.5″ subwoofer · 4 Ω · 150 W RMS
Fs 41.5 HzQts 0.45Vas 0.30 ft³Xmax 0.31″
Recommended box
For a sedan, one sub, 150 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 | 0.18 ft³ (5 L) |
|---|---|
| Qtc | 0.74 |
| Fc | 68 Hz |
| F3 (−3 dB, no cabin gain) | 69 Hz |
| Example box (outside) | 9 1/16″ × 9 1/16″ × 7 3/16″ |
Ported
| Net volume | 0.46 ft³ (13 L) |
|---|---|
| Tuning (Fb) | 39 Hz |
| Port | slot 1 15/16 × 14 5/16″, 103 5/8″ long |
| Port velocity at 150 W | 18 ft/s |
| F3 (−3 dB, no cabin gain) | 36 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 11″ |
The volume and tuning are the recommendation, but the port doesn’t fit this example box. Size the box and port in the designer.
Open ported box in designerThiele/Small parameters
| Fs | 41.5 Hz |
|---|---|
| Qts | 0.45 |
| Qes | 0.47 |
| Qms | 9.92 |
| Vas | 0.30 ft³ |
| Re | 3.68 Ω |
| Sd | 19.9 in² |
| Xmax | 0.31″ |
| Vd | 6.3 in³ calc. |
| Mms | 40 g calc. |
| BL | 9 T·m calc. |
| EBP | 88 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 83.2 dB calc. |
General
| Size | 6.5″ |
|---|---|
| Voice coils | 4 Ω |
| RMS power | 150 W |
Mounting dimensions
| Cutout diameter | 5 13/16″ |
|---|---|
| Mounting depth | 3 1/8″ |
| Overall diameter | 6 5/8″ |
Cone area (Sd) calculated from Fs, Vas and Mms: 19.9 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/GZIW-165X-II_OM-082017.pdf
- ground-zero-audio.com/en/gziw-165x-ii-2/
Other Ground Zero 6.5″ models
- Ground Zero GZHW 16SPL (2x2 Ohm) 6.5″ · dual 2 Ω
- Ground Zero GZIW 165 (4 Ohm) 6.5″ · 4 Ω
- Ground Zero GZIW 165X (4 Ohm) 6.5″ · 4 Ω
- Ground Zero GZRW 6XSPL (2x2 Ohm) 6.5″ · dual 2 Ω