Infinity BETA FIFTEEN X
Best box: 97.0 L bass reflex tuned to 35.7 Hz · F3 37.3 Hz
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Comparable 15.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Infinity BETA FIFTEEN X 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) | 97.0 Liters |
| Tuning Frequency (Fb) | 35.7 Hz |
| F3 (-3 dB Cutoff) | 37.3 Hz |
| F6 / F10 Extension | 32.8 Hz / 28.7 Hz |
| Port Inner Diameter | Ø 12.5 cm |
| Port Physical Length | 20.8 cm |
| First Pipe Resonance | 826.0 Hz |
| Estimated MOL @ F3 | 115.6 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 49.4 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 66.2 Hz |
| F3 (-3 dB Cutoff) | 67.2 Hz |
| F6 / F10 Extension | 48.7 Hz / 35.8 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 24.4 Hz |
| Total Q (Qts) | 0.25 |
| Electrical Q (Qes) | 0.261 |
| Mechanical Q (Qms) | 5.82 |
| Equivalent Volume (Vas) | 345.5 Liters |
| Diaphragm Area (Sd) | 829.0 cm² |
| DC Resistance (Re) | 3.21 Ω |
| Efficiency Bandwidth Product (EBP) | 93.4 |
| Linear Excursion (Xmax) | 10.0 mm |
| Thermal Power (Pe) | 350.0 W |
| Nominal Diameter | 15.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Infinity BETA FIFTEEN X?
Load Forge's calculated alignment puts Infinity BETA FIFTEEN X in a 97.0 liter vented enclosure tuned to 35.7 Hz, reaching an F3 cutoff of approximately 37.3 Hz.
Can Infinity BETA FIFTEEN X be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 49.4 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 67.2 Hz.
What port dimensions should be used for Infinity BETA FIFTEEN X to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 12.5 cm with a length of 20.8 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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