FaitalPRO 15FH520 15" Neodymium Professional Subwoofer 8 Ohm
Best box: 187.7 L bass reflex tuned to 35.3 Hz · F3 33.5 Hz
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Comparable 15.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the FaitalPRO 15FH520 15" Neodymium Professional Subwoofer 8 Ohm 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 (187.7 L) requires extensive internal matrix bracing to prevent panel resonance.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 187.7 Liters |
| Tuning Frequency (Fb) | 35.3 Hz |
| F3 (-3 dB Cutoff) | 33.5 Hz |
| F6 / F10 Extension | 30.1 Hz / 26.7 Hz |
| Port Inner Diameter | Ø 12.5 cm |
| Port Physical Length | 6.8 cm |
| First Pipe Resonance | 2533.0 Hz |
| Estimated MOL @ F3 | 119.3 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 81.6 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 61.7 Hz |
| F3 (-3 dB Cutoff) | 64.8 Hz |
| F6 / F10 Extension | 48.1 Hz / 36.0 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 36.0 Hz |
| Total Q (Qts) | 0.39 |
| Electrical Q (Qes) | 0.406 |
| Mechanical Q (Qms) | 10.1 |
| Equivalent Volume (Vas) | 186.6 Liters |
| Diaphragm Area (Sd) | 847.0 cm² |
| DC Resistance (Re) | 5.6 Ω |
| Efficiency Bandwidth Product (EBP) | 88.7 |
| Linear Excursion (Xmax) | 8.8 mm |
| Thermal Power (Pe) | 600.0 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 FaitalPRO 15FH520 15" Neodymium Professional Subwoofer 8 Ohm?
Load Forge's calculated alignment puts FaitalPRO 15FH520 15" Neodymium Professional Subwoofer 8 Ohm in a 187.7 liter vented enclosure tuned to 35.3 Hz, reaching an F3 cutoff of approximately 33.5 Hz.
Can FaitalPRO 15FH520 15" Neodymium Professional Subwoofer 8 Ohm be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 81.6 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 64.8 Hz.
What port dimensions should be used for FaitalPRO 15FH520 15" Neodymium Professional Subwoofer 8 Ohm to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 12.5 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
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