Machete MFH-80
Best box: 24.0 L bass reflex tuned to 63.8 Hz · F3 87.5 Hz
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Comparable 8.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Machete MFH-80 does not fit your target box volume or tuning. Each entry links to its full enclosure design and Thiele/Small parameters.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 24.0 Liters |
| Tuning Frequency (Fb) | 63.8 Hz |
| F3 (-3 dB Cutoff) | 87.5 Hz |
| F6 / F10 Extension | 72.8 Hz / 56.5 Hz |
| Port Inner Diameter | Ø 10.0 cm |
| Port Physical Length | 16.9 cm |
| First Pipe Resonance | 1015.0 Hz |
| Estimated MOL @ F3 | 112.3 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.71 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 1.004; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 30.0 Liters |
| System Q (Qtc) | 1.004 (above Butterworth: Qtc cannot fall below Qts (0.71)) |
| System Resonance (Fc) | 106.1 Hz |
| F3 (-3 dB Cutoff) | 84.7 Hz |
| F6 / F10 Extension | 69.7 Hz / 55.8 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 75.0 Hz |
| Total Q (Qts) | 0.71 |
| Electrical Q (Qes) | 0.795 |
| Mechanical Q (Qms) | 6.64 |
| Equivalent Volume (Vas) | 30.0 Liters |
| Diaphragm Area (Sd) | 220.0 cm² |
| DC Resistance (Re) | 3.4 Ω |
| Efficiency Bandwidth Product (EBP) | 94.3 |
| Linear Excursion (Xmax) | 10.0 mm |
| Thermal Power (Pe) | 75.0 W |
| Nominal Diameter | 8.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Machete MFH-80?
Load Forge's calculated alignment puts Machete MFH-80 in a 24.0 liter vented enclosure tuned to 63.8 Hz, reaching an F3 cutoff of approximately 87.5 Hz.
Can Machete MFH-80 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 30.0 liters with a Qtc of 1.004 (above Butterworth: Qtc cannot fall below Qts (0.71)), the system exhibits an F3 of 84.7 Hz.
What port dimensions should be used for Machete MFH-80 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 10.0 cm with a length of 16.9 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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