B2 Audio HNx65 D2
6.5″ subwoofer · dual 2 Ω · 300 W RMS
Fs 48.9 HzQts 0.36Vas 0.13 ft³Xmax 0.59″
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 | 0.18 ft³ (5 L) |
|---|---|
| Qtc | 0.48 |
| Fc | 65 Hz |
| F3 (−3 dB, no cabin gain) | 109 Hz |
| Example box (outside) | 8 11/16″ × 8 11/16″ × 7 13/16″ |
Ported
| Net volume | 0.39 ft³ (11 L) |
|---|---|
| Tuning (Fb) | 35 Hz |
| Port | slot 1 15/16 × 14 5/16″, 154 1/16″ long |
| Port velocity at 300 W | 23 ft/s |
| F3 (−3 dB, no cabin gain) | 84 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 14 3/16″ |
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 | 48.9 Hz |
|---|---|
| Qts | 0.36 |
| Qes | 0.39 |
| Qms | 5.07 |
| Vas | 0.13 ft³ |
| Re (one coil) | 1.9 Ω |
| Sd | ≈ 20.2 in² |
| Xmax | 0.59″ |
| EBP | 125 — suits ported calc. |
| Sensitivity, 1 W / 1 m | 82.5 dB calc. |
General
| Size | 6.5″ |
|---|---|
| Voice coils | dual 2 Ω |
| RMS power | 300 W |
Mounting dimensions
| Cutout diameter | ≈ 5 1/2″ |
|---|---|
| Mounting depth | ≈ 2 15/16″ |
“≈” 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.