Apocalypse AP-M67AN PRO
Best box: 1.9 L bass reflex tuned to 138.0 Hz · F3 131.9 Hz
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Comparable 6.5" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Apocalypse AP-M67AN PRO 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 (1.5 L at 230.0 Hz) would need a 37.4 cm port; the recommendation is retuned to 1.9 L at 138.0 Hz so the port can be built.
- Port length (57.9 cm) exceeds a straight internal run; use an elbow bend, slotted vent or 3D folded duct to fit the enclosure.
Recommended Bass Reflex (Vented)
PORT NEEDS ELBOW / 3D| Net Box Volume (Vb) | 1.9 Liters |
| Tuning Frequency (Fb) | 138.0 Hz |
| F3 (-3 dB Cutoff) | 131.9 Hz |
| F6 / F10 Extension | 120.6 Hz / 108.6 Hz |
| Port Inner Diameter | Ø 10.0 cm |
| Port Physical Length | 57.9 cm |
| First Pipe Resonance | 297.0 Hz |
| Estimated MOL @ F3 | 114.3 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 0.24 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 446.7 Hz |
| F3 (-3 dB Cutoff) | 348.1 Hz |
| F6 / F10 Extension | 279.6 Hz / 216.2 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 117.0 Hz |
| Total Q (Qts) | 0.18 |
| Electrical Q (Qes) | 0.202 |
| Mechanical Q (Qms) | 1.65 |
| Equivalent Volume (Vas) | 3.4 Liters |
| Diaphragm Area (Sd) | 132.0 cm² |
| DC Resistance (Re) | 3.4 Ω |
| Efficiency Bandwidth Product (EBP) | 579.1 |
| 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 PRO?
Load Forge's calculated alignment puts Apocalypse AP-M67AN PRO in a 1.9 liter vented enclosure tuned to 138.0 Hz, reaching an F3 cutoff of approximately 131.9 Hz.
Can Apocalypse AP-M67AN PRO be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 0.24 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 348.1 Hz.
What port dimensions should be used for Apocalypse AP-M67AN PRO to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 10.0 cm with a length of 57.9 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
Shareable Acoustic Card for Forums & Social Media
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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