Lii Audio F-15
Best box: 144.0 L bass reflex tuned to 25.5 Hz · F3 35.5 Hz
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Comparable 15.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Lii Audio F-15 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
- Large enclosure volume (144.0 L) requires extensive internal matrix bracing to prevent panel resonance.
- Limited linear excursion (Xmax: 3.5 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) | 144.0 Liters |
| Tuning Frequency (Fb) | 25.5 Hz |
| F3 (-3 dB Cutoff) | 35.5 Hz |
| F6 / F10 Extension | 29.0 Hz / 22.3 Hz |
| Port Inner Diameter | Ø 6.8 cm |
| Port Physical Length | 6.8 cm |
| First Pipe Resonance | 2543.0 Hz |
| Estimated MOL @ F3 | 105.5 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.65 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 0.919; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 180.0 Liters |
| System Q (Qtc) | 0.919 (above Butterworth) |
| System Resonance (Fc) | 42.4 Hz |
| F3 (-3 dB Cutoff) | 35.9 Hz |
| F6 / F10 Extension | 29.1 Hz / 23.0 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 30.0 Hz |
| Total Q (Qts) | 0.65 |
| Electrical Q (Qes) | 0.704 |
| Mechanical Q (Qms) | 8.5 |
| Equivalent Volume (Vas) | 180.0 Liters |
| Diaphragm Area (Sd) | 855.0 cm² |
| DC Resistance (Re) | 7.5 Ω |
| Efficiency Bandwidth Product (EBP) | 42.6 |
| Linear Excursion (Xmax) | 3.5 mm |
| Thermal Power (Pe) | 40.0 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 Lii Audio F-15?
Load Forge's calculated alignment puts Lii Audio F-15 in a 144.0 liter vented enclosure tuned to 25.5 Hz, reaching an F3 cutoff of approximately 35.5 Hz.
Can Lii Audio F-15 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 180.0 liters with a Qtc of 0.919 (above Butterworth), the system exhibits an F3 of 35.9 Hz.
What port dimensions should be used for Lii Audio F-15 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 6.8 cm with a length of 6.8 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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