SoundQubed HDS3.215 D2
15″ subwoofer · dual 2 Ω · 1,200 W RMS
Fs 28.3 HzQts 0.60Vas 2.94 ft³Xmax 1.18″
The published specs don’t add up:
- The published Xmax 1.18″ looks like max (mechanical) excursion, not linear: the excursion-limited power will read too high.
Recommended box
For a sedan, one sub, 1,200 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 | 2.90 ft³ (82 L) |
|---|---|
| Qtc | 0.85 |
| Fc | 40 Hz |
| F3 (−3 dB, no cabin gain) | 36 Hz |
| Example box (outside) | 31 1/2″ × 17 11/16″ × 12 1/4″ |
Ported
| Net volume | 4.91 ft³ (139 L) |
|---|---|
| Tuning (Fb) | 28 Hz |
| Port | slot 3 9/16 × 16 5/16″, 33 13/16″ long |
| Port velocity at 1,200 W | 63 ft/s |
| F3 (−3 dB, no cabin gain) | 24 Hz |
| Example box (outside) | 31 1/2″ × 17 11/16″ × 23 15/16″ |
Thiele/Small parameters
| Fs | 28.3 Hz |
|---|---|
| Qts | 0.60 |
| Qes | 0.663 |
| Qms | 6.39 |
| Vas | 2.94 ft³ |
| Re (one coil) | ≈ 1.7 Ω |
| Sd | 127.1 in² |
| Xmax | 1.18″ |
| Vd | 150.1 in³ calc. |
| Mms | 363 g calc. |
| BL | 12.8 T·m calc. |
| EBP | 43 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 86.5 dB calc. |
General
| Size | 15″ |
|---|---|
| Voice coils | dual 2 Ω |
| RMS power | 1,200 W |
Mounting dimensions
| Cutout diameter | 13 7/8″ |
|---|---|
| Mounting depth | 7 3/4″ |
| Overall diameter | 15 1/2″ |
Cone area (Sd) calculated from Fs, Vas and Mms: 127.1 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 15″ models
- SoundQubed HDS2.215 D2 15″ · dual 2 Ω
- SoundQubed HDS2.215 D4 15″ · dual 4 Ω
- SoundQubed HDS3.215 D4 15″ · dual 4 Ω
- SoundQubed HDX315 D1 15″ · dual 1 Ω
- SoundQubed HDX315 D2 15″ · dual 2 Ω
- SoundQubed HDX415 D1 15″ · dual 1 Ω