SoundQubed HDX 8 D2
8″ subwoofer · dual 2 Ω · 850 W RMS
Fs 42.2 HzQts 0.37Vas 0.18 ft³Xmax 0.47″
Recommended box
For a sedan, one sub, 850 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 | 0.28 ft³ (8 L) |
|---|---|
| Qtc | 0.47 |
| Fc | 54 Hz |
| F3 (−3 dB, no cabin gain) | 92 Hz |
| Example box (outside) | 10 1/4″ × 10 1/4″ × 8 1/2″ |
Ported
| Net volume | 0.57 ft³ (16 L) |
|---|---|
| Tuning (Fb) | 29 Hz |
| Port | slot 1 15/16 × 14 5/16″, 154 5/16″ long |
| Port velocity at 850 W | 44 ft/s |
| F3 (−3 dB, no cabin gain) | 71 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 15″ |
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 | 42.2 Hz |
|---|---|
| Qts | 0.37 |
| Qes | 0.401 |
| Qms | 4.84 |
| Vas | 0.18 ft³ |
| Re (one coil) | ≈ 1.7 Ω |
| Sd | 30.2 in² |
| Xmax | 0.47″ |
| Vd | 14.3 in³ calc. |
| Mms | 149 g calc. |
| BL | 12.9 T·m calc. |
| EBP | 105 — suits ported calc. |
| Sensitivity, 1 W / 1 m | 81.8 dB calc. |
General
| Size | 8″ |
|---|---|
| Voice coils | dual 2 Ω |
| RMS power | 850 W |
Mounting dimensions
| Cutout diameter | 7 1/4″ |
|---|---|
| Mounting depth | 5 9/16″ |
Cone area (Sd) calculated from Fs, Vas and Mms: 30.2 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 SoundQubed 8″ models
- SoundQubed HDS2.208 D2 8″ · dual 2 Ω
- SoundQubed HDS2.208 D4 8″ · dual 4 Ω
- SoundQubed HDX 8 D4 8″ · dual 4 Ω