SICA 15 S 3 PL
Best box: 93.4 L sealed · Fc 58.0 Hz · F3 59.5 Hz
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Comparable 15.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the SICA 15 S 3 PL 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
- Straight vent would be 460.5 cm long: not physically buildable as a simple tube. Use a passive radiator, a folded slot port or model a 3D folded duct in Load Forge Studio.
- Large enclosure volume (214.7 L) requires extensive internal matrix bracing to prevent panel resonance.
Textbook Bass Reflex — not recommended
PORT NOT BUILDABLE| Net Box Volume (Vb) | 214.7 Liters |
| Tuning Frequency (Fb) | 33.1 Hz |
| F3 (-3 dB Cutoff) | 31.5 Hz |
| F6 / F10 Extension | 28.2 Hz / 25.0 Hz |
| Port Inner Diameter | Ø 71.5 cm |
| Port Physical Length | 460.5 cm |
| First Pipe Resonance | 37.0 Hz |
| Estimated MOL @ F3 | 117.2 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 93.4 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 58.0 Hz |
| F3 (-3 dB Cutoff) | 59.5 Hz |
| F6 / F10 Extension | 44.6 Hz / 33.6 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 33.0 Hz |
| Total Q (Qts) | 0.38 |
| Electrical Q (Qes) | 0.391 |
| Mechanical Q (Qms) | 14.1 |
| Equivalent Volume (Vas) | 230.0 Liters |
| Diaphragm Area (Sd) | 855.3 cm² |
| DC Resistance (Re) | 5.2 Ω |
| Efficiency Bandwidth Product (EBP) | 84.5 |
| Linear Excursion (Xmax) | 388.0 mm |
| Thermal Power (Pe) | 400.0 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 SICA 15 S 3 PL?
A simple ported box is not recommended for SICA 15 S 3 PL: the textbook alignment (214.7 liters tuned to 33.1 Hz) needs a 460.5 cm port, and no nearby retune stays buildable without a bass hump. A sealed box, a passive radiator or a folded duct is the practical choice.
Can SICA 15 S 3 PL be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 93.4 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 59.5 Hz.
What port dimensions should be used for SICA 15 S 3 PL to avoid port chuffing?
A straight 71.5 cm port would need 460.5 cm of length, which does not fit a practical cabinet. Use a passive radiator or a folded/3D duct instead of a straight tube.
Shareable Acoustic Card for Forums & Social Media
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