HiVi M4N-B
Best box: 3.4 L bass reflex tuned to 61.5 Hz · F3 93.7 Hz
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Comparable 4.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the HiVi M4N-B 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 (3.4 L at 58.6 Hz) would need a 46.8 cm port; the recommendation is retuned to 3.4 L at 61.5 Hz so the port can be built.
- Limited linear excursion (Xmax: 3.0 mm); set a high-pass subsonic filter at 25–30 Hz when driven with high power.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 3.4 Liters |
| Tuning Frequency (Fb) | 61.5 Hz |
| F3 (-3 dB Cutoff) | 93.7 Hz |
| F6 / F10 Extension | 81.9 Hz / 66.9 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 42.2 cm |
| First Pipe Resonance | 408.0 Hz |
| Estimated MOL @ F3 | 97.3 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 1.08 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 1.527; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 4.3 Liters |
| System Q (Qtc) | 1.527 (above Butterworth: Qtc cannot fall below Qts (1.08)) |
| System Resonance (Fc) | 97.6 Hz |
| F3 (-3 dB Cutoff) | 81.8 Hz |
| F6 / F10 Extension | 71.1 Hz / 59.5 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 69.0 Hz |
| Total Q (Qts) | 1.08 |
| Electrical Q (Qes) | 1.351 |
| Mechanical Q (Qms) | 5.39 |
| Equivalent Volume (Vas) | 4.3 Liters |
| Diaphragm Area (Sd) | 53.4 cm² |
| DC Resistance (Re) | 6.5 Ω |
| Efficiency Bandwidth Product (EBP) | 51.1 |
| Linear Excursion (Xmax) | 3.0 mm |
| Thermal Power (Pe) | 15.0 W |
| Nominal Diameter | 4.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for HiVi M4N-B?
Load Forge's calculated alignment puts HiVi M4N-B in a 3.4 liter vented enclosure tuned to 61.5 Hz, reaching an F3 cutoff of approximately 93.7 Hz.
Can HiVi M4N-B be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 4.3 liters with a Qtc of 1.527 (above Butterworth: Qtc cannot fall below Qts (1.08)), the system exhibits an F3 of 81.8 Hz.
What port dimensions should be used for HiVi M4N-B to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 42.2 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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