Monacor MSH-115HQ4
Best box: 2.4 L bass reflex tuned to 73.2 Hz · F3 95.7 Hz
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Comparable 4.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Monacor MSH-115HQ4 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 (2.4 L at 66.5 Hz) would need a 51.9 cm port; the recommendation is retuned to 2.4 L at 73.2 Hz so the port can be built.
- Limited linear excursion (Xmax: 2.0 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) | 2.4 Liters |
| Tuning Frequency (Fb) | 73.2 Hz |
| F3 (-3 dB Cutoff) | 95.7 Hz |
| F6 / F10 Extension | 72.5 Hz / 57.7 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 42.2 cm |
| First Pipe Resonance | 408.0 Hz |
| Estimated MOL @ F3 | 98.8 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 3.7 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 111.7 Hz |
| F3 (-3 dB Cutoff) | 124.3 Hz |
| F6 / F10 Extension | 92.5 Hz / 69.1 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 95.0 Hz |
| Total Q (Qts) | 0.59 |
| Electrical Q (Qes) | 0.71 |
| Mechanical Q (Qms) | 3.49 |
| Equivalent Volume (Vas) | 1.6 Liters |
| Diaphragm Area (Sd) | 55.0 cm² |
| DC Resistance (Re) | 3.5 Ω |
| Efficiency Bandwidth Product (EBP) | 133.8 |
| Linear Excursion (Xmax) | 2.0 mm |
| Thermal Power (Pe) | 50.0 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 Monacor MSH-115HQ4?
Load Forge's calculated alignment puts Monacor MSH-115HQ4 in a 2.4 liter vented enclosure tuned to 73.2 Hz, reaching an F3 cutoff of approximately 95.7 Hz.
Can Monacor MSH-115HQ4 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 3.7 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 124.3 Hz.
What port dimensions should be used for Monacor MSH-115HQ4 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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