Apocalypse AP-M67AN
Best box: 3.8 L bass reflex tuned to 90.4 Hz · F3 205.8 Hz
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Comparable 6.5" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Apocalypse AP-M67AN 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 (3.0 L at 150.6 Hz) would need a 27.4 cm port; the recommendation is retuned to 3.8 L at 90.4 Hz so the port can be built.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 3.8 Liters |
| Tuning Frequency (Fb) | 90.4 Hz |
| F3 (-3 dB Cutoff) | 205.8 Hz |
| F6 / F10 Extension | 122.0 Hz / 84.4 Hz |
| Port Inner Diameter | Ø 7.5 cm |
| Port Physical Length | 37.3 cm |
| First Pipe Resonance | 461.0 Hz |
| Estimated MOL @ F3 | 117.0 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 1.4 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 270.3 Hz |
| F3 (-3 dB Cutoff) | 264.6 Hz |
| F6 / F10 Extension | 202.1 Hz / 153.0 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 125.0 Hz |
| Total Q (Qts) | 0.31 |
| Electrical Q (Qes) | 0.347 |
| Mechanical Q (Qms) | 2.91 |
| Equivalent Volume (Vas) | 5.7 Liters |
| Diaphragm Area (Sd) | 132.0 cm² |
| DC Resistance (Re) | 3.4 Ω |
| Efficiency Bandwidth Product (EBP) | 360.3 |
| Linear Excursion (Xmax) | 10.0 mm |
| Thermal Power (Pe) | 300.0 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-M67AN?
Load Forge's calculated alignment puts Apocalypse AP-M67AN in a 3.8 liter vented enclosure tuned to 90.4 Hz, reaching an F3 cutoff of approximately 205.8 Hz.
Can Apocalypse AP-M67AN be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 1.4 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 264.6 Hz.
What port dimensions should be used for Apocalypse AP-M67AN to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 7.5 cm with a length of 37.3 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
Shareable Acoustic Card for Forums & Social Media
Embed this design card on DIYAudio, AVSForum, Reddit, or Facebook. It shows the calculated F3, MOL (when the power rating is published) and box parameters.
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