SoundQubed HDX 6.5 D2
6.5″ subwoofer · dual 2 Ω · 450 W RMS
Fs 54.2 HzQts 0.47Vas 0.08 ft³Xmax 0.31″
The published specs don’t add up:
- The spec sheet's Qts 0.546 doesn't match its Qes and Qms (they give 0.47).
Recommended box
For a sedan, one sub, 450 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 | 0.57 |
| Fc | 66 Hz |
| F3 (−3 dB, no cabin gain) | 88 Hz |
| Example box (outside) | 9 1/16″ × 9 1/16″ × 7 3/16″ |
Ported
| Net volume | 0.39 ft³ (11 L) |
|---|---|
| Tuning (Fb) | 34 Hz |
| Port | slot 1 15/16 × 14 5/16″, 163 9/16″ long |
| Port velocity at 450 W | 29 ft/s |
| F3 (−3 dB, no cabin gain) | 31 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 14 13/16″ |
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 | 54.2 Hz |
|---|---|
| Qts | 0.47 |
| Qes | 0.511 |
| Qms | 5.52 |
| Vas | 0.08 ft³ |
| Re (one coil) | ≈ 1.7 Ω |
| Sd | 19.7 in² |
| Xmax | 0.31″ |
| Vd | 6.2 in³ calc. |
| Mms | 85 g calc. |
| BL | 9.8 T·m calc. |
| EBP | 106 — suits ported calc. |
| Sensitivity, 1 W / 1 m | 80.6 dB calc. |
General
| Size | 6.5″ |
|---|---|
| Voice coils | dual 2 Ω |
| RMS power | 450 W |
Mounting dimensions
| Cutout diameter | 5 7/8″ |
|---|---|
| Mounting depth | 4 1/2″ |
Cone area (Sd) calculated from Fs, Vas and Mms: 19.8 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 6.5″ models
- SoundQubed HDS206 D2 6.5″ · dual 2 Ω
- SoundQubed HDS206 D4 6.5″ · dual 4 Ω
- SoundQubed HDX 6.5 D4 6.5″ · dual 4 Ω