Soundking FB1565GCX34
Best box: 218.0 L bass reflex tuned to 34.5 Hz · F3 32.8 Hz
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Comparable 15.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Soundking FB1565GCX34 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 (218.0 L) requires extensive internal matrix bracing to prevent panel resonance.
- Limited linear excursion (Xmax: 3.1 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) | 218.0 Liters |
| Tuning Frequency (Fb) | 34.5 Hz |
| F3 (-3 dB Cutoff) | 32.8 Hz |
| F6 / F10 Extension | 28.9 Hz / 25.7 Hz |
| Port Inner Diameter | Ø 12.5 cm |
| Port Physical Length | 5.2 cm |
| First Pipe Resonance | 3283.0 Hz |
| Estimated MOL @ F3 | 106.2 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 145.4 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 58.4 Hz |
| F3 (-3 dB Cutoff) | 59.8 Hz |
| F6 / F10 Extension | 44.9 Hz / 33.8 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 44.0 Hz |
| Total Q (Qts) | 0.5 |
| Electrical Q (Qes) | 0.584 |
| Mechanical Q (Qms) | 3.49 |
| Equivalent Volume (Vas) | 145.3 Liters |
| Diaphragm Area (Sd) | 865.7 cm² |
| DC Resistance (Re) | 3.4 Ω |
| Efficiency Bandwidth Product (EBP) | 75.4 |
| Linear Excursion (Xmax) | 3.1 mm |
| Thermal Power (Pe) | 30.0 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 Soundking FB1565GCX34?
Load Forge's calculated alignment puts Soundking FB1565GCX34 in a 218.0 liter vented enclosure tuned to 34.5 Hz, reaching an F3 cutoff of approximately 32.8 Hz.
Can Soundking FB1565GCX34 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 145.4 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 59.8 Hz.
What port dimensions should be used for Soundking FB1565GCX34 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 12.5 cm with a length of 5.2 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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