Apocalypse AP-M61SE
Best box: 10.2 L bass reflex tuned to 86.2 Hz · F3 85.3 Hz
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Comparable 6.5" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Apocalypse AP-M61SE 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) | 10.2 Liters |
| Tuning Frequency (Fb) | 86.2 Hz |
| F3 (-3 dB Cutoff) | 85.3 Hz |
| F6 / F10 Extension | 73.3 Hz / 64.6 Hz |
| Port Inner Diameter | Ø 7.5 cm |
| Port Physical Length | 12.1 cm |
| First Pipe Resonance | 1420.0 Hz |
| Estimated MOL @ F3 | 111.9 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 7.4 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 147.5 Hz |
| F3 (-3 dB Cutoff) | 149.6 Hz |
| F6 / F10 Extension | 113.1 Hz / 85.4 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 112.0 Hz |
| Total Q (Qts) | 0.51 |
| Electrical Q (Qes) | 0.571 |
| Mechanical Q (Qms) | 4.77 |
| Equivalent Volume (Vas) | 6.8 Liters |
| Diaphragm Area (Sd) | 132.0 cm² |
| DC Resistance (Re) | 3.4 Ω |
| Efficiency Bandwidth Product (EBP) | 196.1 |
| Linear Excursion (Xmax) | 10.0 mm |
| Thermal Power (Pe) | 130.0 W |
| Nominal Diameter | 6.5" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Apocalypse AP-M61SE?
Load Forge's calculated alignment puts Apocalypse AP-M61SE in a 10.2 liter vented enclosure tuned to 86.2 Hz, reaching an F3 cutoff of approximately 85.3 Hz.
Can Apocalypse AP-M61SE be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 7.4 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 149.6 Hz.
What port dimensions should be used for Apocalypse AP-M61SE to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 7.5 cm with a length of 12.1 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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