SoundQubed HDS3.212 D4
12″ subwoofer · dual 4 Ω · 1,200 W RMS
Fs 32.2 HzQts 0.53Vas 1.03 ft³Xmax 1.10″
The published specs don’t add up:
- The published Xmax 1.10″ 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 | 0.81 ft³ (23 L) |
|---|---|
| Qtc | 0.80 |
| Fc | 48 Hz |
| F3 (−3 dB, no cabin gain) | 46 Hz |
| Example box (outside) | 14 9/16″ × 14 9/16″ × 10 9/16″ |
Ported
| Net volume | 2.54 ft³ (72 L) |
|---|---|
| Tuning (Fb) | 27 Hz |
| Port | slot 2 15/16 × 14 5/16″, 55 5/8″ long |
| Port velocity at 1,200 W | 65 ft/s |
| F3 (−3 dB, no cabin gain) | 24 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 18 9/16″ |
Thiele/Small parameters
| Fs | 32.2 Hz |
|---|---|
| Qts | 0.53 |
| Qes | 0.586 |
| Qms | 5.77 |
| Vas | 1.03 ft³ |
| Re (one coil) | ≈ 3.4 Ω |
| Sd | 78.2 in² |
| Xmax | 1.10″ |
| Vd | 86.2 in³ calc. |
| Mms | 302 g calc. |
| BL | 18.8 T·m calc. |
| EBP | 55 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 84.2 dB calc. |
General
| Size | 12″ |
|---|---|
| Voice coils | dual 4 Ω |
| RMS power | 1,200 W |
Mounting dimensions
| Cutout diameter | 11 1/4″ |
|---|---|
| Mounting depth | 6 3/4″ |
| Overall diameter | 12 3/4″ |
Cone area (Sd) calculated from Fs, Vas and Mms: 78.2 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 12″ models
- SoundQubed HDS2.212 D2 12″ · dual 2 Ω
- SoundQubed HDS2.212 D4 12″ · dual 4 Ω
- SoundQubed HDS3.212 D2 12″ · dual 2 Ω
- SoundQubed HDX312 D1 12″ · dual 1 Ω
- SoundQubed HDX312 D2 12″ · dual 2 Ω
- SoundQubed HDX412 D1 12″ · dual 1 Ω