Sealed 17 L
Follow the original construction and damping instructions.
Hertz / SUBWOOFER
Hertz MP 250 D4.3 — specifications and enclosures
Hertz MP 250 D4.3: T/S parameters, mounting dimensions and manufacturer enclosure recommendations. Read the original PDF and load the driver into the 3D designer.
Sd calculated from manufacturer effective diameter D: π × (D/10)² / 4 cm². T/S values use parallel voice coils.
Manufacturer enclosure recommendations
Bass-reflex 24.5 L
Tuning Fb: 38 Hz.
Follow the original construction and damping instructions.
Calculator parameters
| Fs | 27.0 Hz |
|---|---|
| Vas | 31.0 L |
| Qes | 0.53 |
| Qms | 5.8 |
| Re | 1.8 Ω |
| Sd | 356.33 cm² |
| Le | 1.6 mH |
| One-way linear Xmax | 17 mm |
| Frame diameter | 26.8 cm |
| Mounting cutout | 23.6 cm |
| Mounting depth | 14.1 cm |
Additional manufacturer specifications
| Published Qts | 0.5 |
|---|---|
| Published Xmax (definition to verify) | 17.0 mm |
| Mms | 187.00 g |
| Cms | 0.18 mm/N |
| BL | 10.5 T·m |
| Spl | 83.5 dB |
Data is for one subwoofer. Manufacturer recommendations are separate from CarBoxLab calculations. Net air volume excludes the driver, port and bracing; design dimensions are external. Loading a recommendation transfers the verified volume and tuning; confirm port geometry and construction separately.
Source documentation
Manufacturer technical documentation
Original manufacturer documents are not translated. Data reviewed: 2026-10-31.