Ground Zero GZIW 165 (4 Ohm)
6.5″ subwoofer · 4 Ω · 100 W RMS
Fs 41 HzQts 0.41Vas 0.32 ft³
Recommended box
For a sedan, one sub, 100 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 | 0.69 |
| Fc | 69 Hz |
| F3 (−3 dB, no cabin gain) | 74 Hz |
| Example box (outside) | 9 1/16″ × 9 1/16″ × 7 3/16″ |
Ported
| Net volume | 0.39 ft³ (11 L) |
|---|---|
| Tuning (Fb) | 41 Hz |
| Port | slot 1 15/16 × 14 5/16″, 111 1/16″ long |
| Port velocity at 100 W | 13 ft/s |
| F3 (−3 dB, no cabin gain) | 39 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 11 1/4″ |
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 Hz |
|---|---|
| Qts | 0.41 |
| Qes | 0.43 |
| Qms | 10.7 |
| Vas | 0.32 ft³ |
| Re | 3.6 Ω |
| Sd | 20.3 in² |
| Xmax | ≈ 0.39″ |
| Mms | 40 g calc. |
| BL | 9.3 T·m calc. |
| EBP | 95 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 83.6 dB calc. |
General
| Size | 6.5″ |
|---|---|
| Voice coils | 4 Ω |
| RMS power | 100 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: 20.3 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
Other Ground Zero 6.5″ models
- Ground Zero GZHW 16SPL (2x2 Ohm) 6.5″ · dual 2 Ω
- Ground Zero GZIW 165X (4 Ohm) 6.5″ · 4 Ω
- Ground Zero GZIW 165X-II (4 Ohm) 6.5″ · 4 Ω
- Ground Zero GZRW 6XSPL (2x2 Ohm) 6.5″ · dual 2 Ω