Aurum Cantus AC165/50C2C 6-1/2" Midwoofer
Best box: 4.1 L bass reflex tuned to 76.2 Hz · F3 89.3 Hz
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Comparable 6.5" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Aurum Cantus AC165/50C2C 6-1/2" Midwoofer 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 (4.1 L at 69.3 Hz) would need a 50.4 cm port; the recommendation is retuned to 4.1 L at 76.2 Hz so the port can be built.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 4.1 Liters |
| Tuning Frequency (Fb) | 76.2 Hz |
| F3 (-3 dB Cutoff) | 89.3 Hz |
| F6 / F10 Extension | 76.4 Hz / 65.0 Hz |
| Port Inner Diameter | Ø 6.8 cm |
| Port Physical Length | 40.9 cm |
| First Pipe Resonance | 421.0 Hz |
| Estimated MOL @ F3 | 109.1 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 2.5 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 134.1 Hz |
| F3 (-3 dB Cutoff) | 124.3 Hz |
| F6 / F10 Extension | 96.3 Hz / 73.3 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 37.0 Hz |
| Total Q (Qts) | 0.19 |
| Electrical Q (Qes) | 0.199 |
| Mechanical Q (Qms) | 4.22 |
| Equivalent Volume (Vas) | 32.0 Liters |
| Diaphragm Area (Sd) | 133.0 cm² |
| DC Resistance (Re) | 7.0 Ω |
| Efficiency Bandwidth Product (EBP) | 186.0 |
| Linear Excursion (Xmax) | 6.0 mm |
| Thermal Power (Pe) | 150.0 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 Aurum Cantus AC165/50C2C 6-1/2" Midwoofer?
Load Forge's calculated alignment puts Aurum Cantus AC165/50C2C 6-1/2" Midwoofer in a 4.1 liter vented enclosure tuned to 76.2 Hz, reaching an F3 cutoff of approximately 89.3 Hz.
Can Aurum Cantus AC165/50C2C 6-1/2" Midwoofer be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 2.5 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 124.3 Hz.
What port dimensions should be used for Aurum Cantus AC165/50C2C 6-1/2" Midwoofer to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 6.8 cm with a length of 40.9 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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Not sure if AC165/50C2C 6-1/2" Midwoofer fits your physical space?
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