Crossfire C312D4-V3
12″ subwoofer · dual 4 Ω · 400 W RMS
Fs 29 HzQts 0.46Vas 2.04 ft³Xmax 0.47″
Recommended box
For a sedan, one sub, 400 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 | 0.99 ft³ (28 L) |
|---|---|
| Qtc | 0.80 |
| Fc | 51 Hz |
| F3 (−3 dB, no cabin gain) | 48 Hz |
| Example box (outside) | 14 9/16″ × 14 9/16″ × 12 3/8″ |
Ported
| Net volume | 2.93 ft³ (83 L) |
|---|---|
| Tuning (Fb) | 29 Hz |
| Port | slot 1 15/16 × 14 5/16″, 26 3/16″ long |
| Port velocity at 400 W | 61 ft/s |
| F3 (−3 dB, no cabin gain) | 26 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 15 13/16″ |
Thiele/Small parameters
| Fs | 29 Hz |
|---|---|
| Qts | 0.46 |
| Qes | 0.5 |
| Qms | 5.32 |
| Vas | 2.04 ft³ |
| Re (one coil) | 3.9 Ω |
| Sd | 75.7 in² |
| Xmax | 0.47″ |
| Vd | 35.8 in³ calc. |
| Mms | 176 g calc. |
| BL | 15.8 T·m calc. |
| EBP | 58 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 86.5 dB calc. |
General
| Size | 12″ |
|---|---|
| Voice coils | dual 4 Ω |
| RMS power | 400 W |
Mounting dimensions
| Cutout diameter | ≈ 11 1/4″ |
|---|---|
| Mounting depth | 6 1/2″ |
| Overall diameter | 12 1/2″ |
Cone area (Sd) calculated from Fs, Vas and Mms: 75.8 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
- crossfirecaraudio.com/wp-content/uploads/2020/03/C3-Product-Manual.pdf
- crossfirecaraudio.com/product-manuals/
Other Crossfire 12″ models
- Crossfire C7 12D1 12″ · dual 1 Ω
- Crossfire C7 12D2 12″ · dual 2 Ω
- Crossfire C312D2-V3 12″ · dual 2 Ω