Audax HM170C0 6.5" Carbon Fiber Woofer
Best box: 0.28 L sealed · Fc 92.7 Hz · F3 92.8 Hz
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Comparable 6.5" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Audax HM170C0 6.5" Carbon Fiber Woofer 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
- Xmax is not published, so the port size is an empirical estimate (area ≥ 12 in² per ft³ of net volume, minimum by driver size), not a displacement calculation. Check air velocity in Load Forge Studio.
- Straight vent would be 158.5 cm long: not physically buildable as a simple tube. Use a passive radiator, a folded slot port or model a 3D folded duct in Load Forge Studio.
Textbook Bass Reflex — not recommended
PORT NOT BUILDABLE| Net Box Volume (Vb) | 1.5 Liters |
| Tuning Frequency (Fb) | 49.2 Hz |
| F3 (-3 dB Cutoff) | 45.6 Hz |
| F6 / F10 Extension | 42.3 Hz / 38.5 Hz |
| Port Inner Diameter ESTIMATED | Ø 5.0 cm |
| Port Physical Length | 158.5 cm |
| First Pipe Resonance | 109.0 Hz |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 0.28 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 92.7 Hz |
| F3 (-3 dB Cutoff) | 92.8 Hz |
| F6 / F10 Extension | 70.4 Hz / 53.2 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 42.0 Hz |
| Total Q (Qts) | 0.32 |
| Electrical Q (Qes) | 0.347 |
| Mechanical Q (Qms) | 4.16 |
| Equivalent Volume (Vas) | 1.1 Liters |
| Diaphragm Area (Sd) | 132.0 cm² |
| DC Resistance (Re) | 5.6 Ω |
| Efficiency Bandwidth Product (EBP) | 121.2 |
| Linear Excursion (Xmax) | N/A mm |
| Thermal Power (Pe) | N/A 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 Audax HM170C0 6.5" Carbon Fiber Woofer?
A simple ported box is not recommended for Audax HM170C0 6.5" Carbon Fiber Woofer: the textbook alignment (1.5 liters tuned to 49.2 Hz) needs a 158.5 cm port, and no nearby retune stays buildable without a bass hump. A sealed box, a passive radiator or a folded duct is the practical choice.
Can Audax HM170C0 6.5" Carbon Fiber Woofer be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 0.28 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 92.8 Hz.
What port dimensions should be used for Audax HM170C0 6.5" Carbon Fiber Woofer to avoid port chuffing?
A straight 5.0 cm port would need 158.5 cm of length, which does not fit a practical cabinet. Use a passive radiator or a folded/3D duct instead of a straight tube.
Shareable Acoustic Card for Forums & Social Media
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