Audax HT240G0-4
Best box: 28.7 L bass reflex tuned to 41.6 Hz · F3 54.3 Hz
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Comparable 9.8" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Audax HT240G0-4 does not fit your target box volume or tuning. Each entry links to its full enclosure design and Thiele/Small parameters.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 28.7 Liters |
| Tuning Frequency (Fb) | 41.6 Hz |
| F3 (-3 dB Cutoff) | 54.3 Hz |
| F6 / F10 Extension | 45.7 Hz / 37.2 Hz |
| Port Inner Diameter | Ø 6.8 cm |
| Port Physical Length | 17.1 cm |
| First Pipe Resonance | 1008.0 Hz |
| Estimated MOL @ F3 | 110.8 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.67 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 0.948; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 35.8 Liters |
| System Q (Qtc) | 0.948 (above Butterworth) |
| System Resonance (Fc) | 69.2 Hz |
| F3 (-3 dB Cutoff) | 53.9 Hz |
| F6 / F10 Extension | 42.8 Hz / 33.4 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 48.9 Hz |
| Total Q (Qts) | 0.67 |
| Electrical Q (Qes) | 0.718 |
| Mechanical Q (Qms) | 10.01 |
| Equivalent Volume (Vas) | 35.8 Liters |
| Diaphragm Area (Sd) | 323.6 cm² |
| DC Resistance (Re) | 2.9 Ω |
| Efficiency Bandwidth Product (EBP) | 68.1 |
| Linear Excursion (Xmax) | 7.0 mm |
| Thermal Power (Pe) | 160.0 W |
| Nominal Diameter | 9.8" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Audax HT240G0-4?
Load Forge's calculated alignment puts Audax HT240G0-4 in a 28.7 liter vented enclosure tuned to 41.6 Hz, reaching an F3 cutoff of approximately 54.3 Hz.
Can Audax HT240G0-4 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 35.8 liters with a Qtc of 0.948 (above Butterworth), the system exhibits an F3 of 53.9 Hz.
What port dimensions should be used for Audax HT240G0-4 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 6.8 cm with a length of 17.1 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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