Hannibal HM-8E+
Best box: 5.8 L bass reflex tuned to 88.5 Hz · F3 112.6 Hz
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Comparable 8.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Hannibal HM-8E+ 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 (5.8 L at 68.1 Hz) would need a 80.4 cm port; the recommendation is retuned to 5.8 L at 88.5 Hz so the port can be built.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 5.8 Liters |
| Tuning Frequency (Fb) | 88.5 Hz |
| F3 (-3 dB Cutoff) | 112.6 Hz |
| F6 / F10 Extension | 99.0 Hz / 81.6 Hz |
| Port Inner Diameter | Ø 10.0 cm |
| Port Physical Length | 44.7 cm |
| First Pipe Resonance | 385.0 Hz |
| Estimated MOL @ F3 | 110.8 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 1.01 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 1.428; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 7.2 Liters |
| System Q (Qtc) | 1.428 (above Butterworth: Qtc cannot fall below Qts (1.01)) |
| System Resonance (Fc) | 113.3 Hz |
| F3 (-3 dB Cutoff) | 93.4 Hz |
| F6 / F10 Extension | 80.3 Hz / 66.6 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 80.1 Hz |
| Total Q (Qts) | 1.01 |
| Electrical Q (Qes) | 1.131 |
| Mechanical Q (Qms) | 9.44 |
| Equivalent Volume (Vas) | 7.2 Liters |
| Diaphragm Area (Sd) | 220.0 cm² |
| DC Resistance (Re) | 3.4 Ω |
| Efficiency Bandwidth Product (EBP) | 70.8 |
| Linear Excursion (Xmax) | 10.0 mm |
| Thermal Power (Pe) | 85.0 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 Hannibal HM-8E+?
Load Forge's calculated alignment puts Hannibal HM-8E+ in a 5.8 liter vented enclosure tuned to 88.5 Hz, reaching an F3 cutoff of approximately 112.6 Hz.
Can Hannibal HM-8E+ be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 7.2 liters with a Qtc of 1.428 (above Butterworth: Qtc cannot fall below Qts (1.01)), the system exhibits an F3 of 93.4 Hz.
What port dimensions should be used for Hannibal HM-8E+ to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 10.0 cm with a length of 44.7 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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