SICA 5.5 H 1.5 CP
Best box: 3.2 L sealed · Fc 90.3 Hz · F3 90.1 Hz
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Comparable 5.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the SICA 5.5 H 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 516.5 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.
Textbook Bass Reflex — not recommended
PORT NOT BUILDABLE| Net Box Volume (Vb) | 7.3 Liters |
| Tuning Frequency (Fb) | 49.3 Hz |
| F3 (-3 dB Cutoff) | 48.3 Hz |
| F6 / F10 Extension | 42.9 Hz / 37.7 Hz |
| Port Inner Diameter | Ø 20.0 cm |
| Port Physical Length | 516.5 cm |
| First Pipe Resonance | 33.0 Hz |
| Estimated MOL @ F3 | 102.8 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 3.2 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 90.3 Hz |
| F3 (-3 dB Cutoff) | 90.1 Hz |
| F6 / F10 Extension | 68.1 Hz / 51.3 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 48.0 Hz |
| Total Q (Qts) | 0.37 |
| Electrical Q (Qes) | 0.407 |
| Mechanical Q (Qms) | 4.07 |
| Equivalent Volume (Vas) | 8.4 Liters |
| Diaphragm Area (Sd) | 78.5 cm² |
| DC Resistance (Re) | 6.1 Ω |
| Efficiency Bandwidth Product (EBP) | 117.9 |
| Linear Excursion (Xmax) | 140.0 mm |
| Thermal Power (Pe) | 120.0 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 5.5 H 1.5 CP?
A simple ported box is not recommended for SICA 5.5 H 1.5 CP: the textbook alignment (7.3 liters tuned to 49.3 Hz) needs a 516.5 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 5.5 H 1.5 CP be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 3.2 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 90.1 Hz.
What port dimensions should be used for SICA 5.5 H 1.5 CP to avoid port chuffing?
A straight 20.0 cm port would need 516.5 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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