Audax PR330T4
Best box: 11.0 L bass reflex tuned to 79.7 Hz · F3 89.9 Hz
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Comparable 13.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Audax PR330T4 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 (11.0 L at 75.9 Hz) would need a 49.1 cm port; the recommendation is retuned to 11.0 L at 79.7 Hz so the port can be built.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 11.0 Liters |
| Tuning Frequency (Fb) | 79.7 Hz |
| F3 (-3 dB Cutoff) | 89.9 Hz |
| F6 / F10 Extension | 77.0 Hz / 65.8 Hz |
| Port Inner Diameter | Ø 12.5 cm |
| Port Physical Length | 43.7 cm |
| First Pipe Resonance | 394.0 Hz |
| Estimated MOL @ F3 | 116.7 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 5.7 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 142.1 Hz |
| F3 (-3 dB Cutoff) | 132.5 Hz |
| F6 / F10 Extension | 103.8 Hz / 79.4 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 50.0 Hz |
| Total Q (Qts) | 0.24 |
| Electrical Q (Qes) | 0.284 |
| Mechanical Q (Qms) | 1.54 |
| Equivalent Volume (Vas) | 43.9 Liters |
| Diaphragm Area (Sd) | 538.0 cm² |
| DC Resistance (Re) | 5.8 Ω |
| Efficiency Bandwidth Product (EBP) | 175.9 |
| Linear Excursion (Xmax) | 5.5 mm |
| Thermal Power (Pe) | 350.0 W |
| Nominal Diameter | 13.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Audax PR330T4?
Load Forge's calculated alignment puts Audax PR330T4 in a 11.0 liter vented enclosure tuned to 79.7 Hz, reaching an F3 cutoff of approximately 89.9 Hz.
Can Audax PR330T4 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 5.7 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 132.5 Hz.
What port dimensions should be used for Audax PR330T4 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 12.5 cm with a length of 43.7 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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