Ground Zero GZIW 165X (4 Ohm)
6.5″ subwoofer · 4 Ω · 100 W RMS
Fs 43 HzQts 0.36Vas 0.39 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 | 0.64 |
| Fc | 77 Hz |
| F3 (−3 dB, no cabin gain) | 90 Hz |
| Example box (outside) | 9 1/16″ × 9 1/16″ × 7 3/16″ |
Ported
| Net volume | 0.39 ft³ (11 L) |
|---|---|
| Tuning (Fb) | 45 Hz |
| Port | slot 1 15/16 × 14 5/16″, 91 1/2″ long |
| Port velocity at 100 W | 14 ft/s |
| F3 (−3 dB, no cabin gain) | 44 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 9 7/8″ |
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 | 43 Hz |
|---|---|
| Qts | 0.36 |
| Qes | 0.383 |
| Qms | 6 |
| Vas | 0.39 ft³ |
| Re | ≈ 3.4 Ω |
| Sd | ≈ 20.2 in² |
| Xmax | ≈ 0.39″ |
| EBP | 112 — suits ported calc. |
| Sensitivity, 1 W / 1 m | 85.6 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″ |
Only Qts is published — Qms assumed to be 6 and Qes calculated (barely affects box design).
“≈” 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 165 (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