Hertz PRO MP250.D4.3
Best box: 46.5 L bass reflex tuned to 22.3 Hz · F3 21.6 Hz
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Comparable 10.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Hertz PRO MP250.D4.3 does not fit your target box volume or tuning. Each entry links to its full enclosure design and Thiele/Small parameters.
⚠️ Engineering Notice for Builders
- The textbook alignment (46.5 L at 21.2 Hz) would need a 105.5 cm port; the recommendation is retuned to 46.5 L at 22.3 Hz so the port can be built.
- Port length (94.7 cm) exceeds a straight internal run; use an elbow bend, slotted vent or 3D folded duct to fit the enclosure.
Recommended Bass Reflex (Vented)
PORT NEEDS ELBOW / 3D| Net Box Volume (Vb) | 46.5 Liters |
| Tuning Frequency (Fb) | 22.3 Hz |
| F3 (-3 dB Cutoff) | 21.6 Hz |
| F6 / F10 Extension | 18.9 Hz / 16.7 Hz |
| Port Inner Diameter | Ø 10.0 cm |
| Port Physical Length | 94.7 cm |
| First Pipe Resonance | 182.0 Hz |
| Estimated MOL @ F3 | 116.4 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 31.0 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 37.8 Hz |
| F3 (-3 dB Cutoff) | 40.7 Hz |
| F6 / F10 Extension | 30.2 Hz / 22.6 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 27.0 Hz |
| Total Q (Qts) | 0.5 |
| Electrical Q (Qes) | 0.547 |
| Mechanical Q (Qms) | 5.8 |
| Equivalent Volume (Vas) | 31.0 Liters |
| Diaphragm Area (Sd) | 351.2 cm² |
| DC Resistance (Re) | 1.8 Ω |
| Efficiency Bandwidth Product (EBP) | 49.3 |
| Linear Excursion (Xmax) | 17.0 mm |
| Thermal Power (Pe) | N/A W |
| Nominal Diameter | 10.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Hertz PRO MP250.D4.3?
Load Forge's calculated alignment puts Hertz PRO MP250.D4.3 in a 46.5 liter vented enclosure tuned to 22.3 Hz, reaching an F3 cutoff of approximately 21.6 Hz.
Can Hertz PRO MP250.D4.3 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 31.0 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 40.7 Hz.
What port dimensions should be used for Hertz PRO MP250.D4.3 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 10.0 cm with a length of 94.7 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
Shareable Acoustic Card for Forums & Social Media
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