Audax HM130Z4-8+8
Best box: 2.3 L bass reflex tuned to 76.1 Hz · F3 84.8 Hz
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Comparable 5.35" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Audax HM130Z4-8+8 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 (2.3 L at 72.5 Hz) would need a 45.1 cm port; the recommendation is retuned to 2.3 L at 76.1 Hz so the port can be built.
- Limited linear excursion (Xmax: 3.25 mm); set a high-pass subsonic filter at 25–30 Hz when driven with high power.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 2.3 Liters |
| Tuning Frequency (Fb) | 76.1 Hz |
| F3 (-3 dB Cutoff) | 84.8 Hz |
| F6 / F10 Extension | 73.0 Hz / 62.7 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 40.6 cm |
| First Pipe Resonance | 424.0 Hz |
| Estimated MOL @ F3 | 101.4 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 1.2 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 139.0 Hz |
| F3 (-3 dB Cutoff) | 128.0 Hz |
| F6 / F10 Extension | 99.2 Hz / 75.4 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 46.0 Hz |
| Total Q (Qts) | 0.23 |
| Electrical Q (Qes) | 0.241 |
| Mechanical Q (Qms) | 5.2 |
| Equivalent Volume (Vas) | 10.2 Liters |
| Diaphragm Area (Sd) | 80.0 cm² |
| DC Resistance (Re) | 3.0 Ω |
| Efficiency Bandwidth Product (EBP) | 191.2 |
| Linear Excursion (Xmax) | 3.2 mm |
| Thermal Power (Pe) | 50.0 W |
| Nominal Diameter | 5.35" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Audax HM130Z4-8+8?
Load Forge's calculated alignment puts Audax HM130Z4-8+8 in a 2.3 liter vented enclosure tuned to 76.1 Hz, reaching an F3 cutoff of approximately 84.8 Hz.
Can Audax HM130Z4-8+8 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 1.2 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 128.0 Hz.
What port dimensions should be used for Audax HM130Z4-8+8 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 40.6 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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