Lanzar DCT124D
12″ subwoofer · dual 4 Ω
Fs 28 HzQts 0.77Vas 1.26 ft³
Recommended box
For a sedan, one sub, 300 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 | 1.73 ft³ (49 L) |
|---|---|
| Qtc | 1.02 |
| Fc | 37 Hz |
| F3 (−3 dB, no cabin gain) | 30 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 8 3/4″ |
Ported
| Net volume | 2.93 ft³ (83 L) |
|---|---|
| Tuning (Fb) | 26 Hz |
| Port | slot 1 9/16 × 14 5/16″, 26 1/2″ long |
| Port velocity at 300 W | 59 ft/s |
| F3 (−3 dB, no cabin gain) | 22 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 15 1/2″ |
Thiele/Small parameters
| Fs | 28 Hz |
|---|---|
| Qts | 0.77 |
| Qes | 0.887 |
| Qms | 6 |
| Vas | 1.26 ft³ |
| Re (one coil) | ≈ 3.4 Ω |
| Sd | ≈ 76 in² |
| Xmax | ≈ 0.39″ |
| EBP | 32 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 81.5 dB calc. |
General
| Size | 12″ |
|---|---|
| Voice coils | dual 4 Ω |
| RMS power | — |
Mounting dimensions
| Cutout diameter | ≈ 11 1/8″ |
|---|---|
| Mounting depth | ≈ 5 7/8″ |
Only Qts is published — Qms assumed to be 6 and Qes calculated (barely affects box design).
“≈” 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 Lanzar 12″ models
- Lanzar MAX12 12″ · 4 Ω
- Lanzar MAX12D 12″ · dual 4 Ω
- Lanzar OPTI1232D 12″ · dual 2 Ω
- Lanzar OPTI1233D 12″ · dual 1.3 Ω
- Lanzar OPTI1244D 12″ · dual 4 Ω