Lanzar DCT15D
15″ subwoofer · dual 4 Ω
Fs 25 HzQts 0.86Vas 5.22 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 | 2.83 ft³ (80 L) |
|---|---|
| Qtc | 1.45 |
| Fc | 42 Hz |
| F3 (−3 dB, no cabin gain) | 31 Hz |
| Example box (outside) | 31 1/2″ × 18 1/8″ × 11 3/4″ |
Ported
| Net volume | 4.80 ft³ (136 L) |
|---|---|
| Tuning (Fb) | 34 Hz |
| Port | slot 1 9/16 × 16 11/16″, 8 7/16″ long |
| Port velocity at 300 W | 63 ft/s |
| F3 (−3 dB, no cabin gain) | 29 Hz |
| Example box (outside) | 31 1/2″ × 18 1/8″ × 19 1/8″ |
Thiele/Small parameters
| Fs | 25 Hz |
|---|---|
| Qts | 0.86 |
| Qes | 1.004 |
| Qms | 6 |
| Vas | 5.22 ft³ |
| Re (one coil) | ≈ 3.4 Ω |
| Sd | ≈ 124 in² |
| Xmax | ≈ 0.39″ |
| EBP | 25 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 85.6 dB calc. |
General
| Size | 15″ |
|---|---|
| Voice coils | dual 4 Ω |
| RMS power | — |
Mounting dimensions
| Cutout diameter | ≈ 14″ |
|---|---|
| Mounting depth | ≈ 7 1/16″ |
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 15″ models
- Lanzar HRWDC15 15″ · dual 4 Ω
- Lanzar MAX15D 15″ · dual 4 Ω
- Lanzar OPTI1522D 15″ · dual 2 Ω
- Lanzar OPTI1532D 15″ · dual 2 Ω