SICA 5 F 1.5 CP
Best box: 1.5 L sealed · Fc 140.9 Hz · F3 135.7 Hz
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Comparable 5.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the SICA 5 F 1.5 CP 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 499.2 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.
Textbook Bass Reflex — not recommended
PORT NOT BUILDABLE| Net Box Volume (Vb) | 3.2 Liters |
| Tuning Frequency (Fb) | 75.7 Hz |
| F3 (-3 dB Cutoff) | 79.8 Hz |
| F6 / F10 Extension | 69.3 Hz / 60.0 Hz |
| Port Inner Diameter | Ø 20.0 cm |
| Port Physical Length | 499.2 cm |
| First Pipe Resonance | 34.0 Hz |
| Estimated MOL @ F3 | 105.0 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 1.5 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 140.9 Hz |
| F3 (-3 dB Cutoff) | 135.7 Hz |
| F6 / F10 Extension | 103.9 Hz / 78.7 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 61.0 Hz |
| Total Q (Qts) | 0.3 |
| Electrical Q (Qes) | 0.323 |
| Mechanical Q (Qms) | 4.23 |
| Equivalent Volume (Vas) | 6.8 Liters |
| Diaphragm Area (Sd) | 78.5 cm² |
| DC Resistance (Re) | 5.6 Ω |
| Efficiency Bandwidth Product (EBP) | 188.9 |
| Linear Excursion (Xmax) | 132.0 mm |
| Thermal Power (Pe) | 100.0 W |
| Nominal Diameter | 5.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for SICA 5 F 1.5 CP?
A simple ported box is not recommended for SICA 5 F 1.5 CP: the textbook alignment (3.2 liters tuned to 75.7 Hz) needs a 499.2 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 5 F 1.5 CP be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 1.5 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 135.7 Hz.
What port dimensions should be used for SICA 5 F 1.5 CP to avoid port chuffing?
A straight 20.0 cm port would need 499.2 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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