SICA 4 L1 1 SL
Best box: 0.42 L sealed · Fc 231.4 Hz · F3 230.0 Hz
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Comparable 4.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the SICA 4 L1 1 SL 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 378.6 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) | 1.5 Liters |
| Tuning Frequency (Fb) | 126.4 Hz |
| F3 (-3 dB Cutoff) | 117.0 Hz |
| F6 / F10 Extension | 107.3 Hz / 96.5 Hz |
| Port Inner Diameter | Ø 20.0 cm |
| Port Physical Length | 378.6 cm |
| First Pipe Resonance | 45.0 Hz |
| Estimated MOL @ F3 | 104.7 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 0.42 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 231.4 Hz |
| F3 (-3 dB Cutoff) | 230.0 Hz |
| F6 / F10 Extension | 174.7 Hz / 132.0 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 120.0 Hz |
| Total Q (Qts) | 0.36 |
| Electrical Q (Qes) | 0.432 |
| Mechanical Q (Qms) | 2.15 |
| Equivalent Volume (Vas) | 1.2 Liters |
| Diaphragm Area (Sd) | 44.2 cm² |
| DC Resistance (Re) | 5.5 Ω |
| Efficiency Bandwidth Product (EBP) | 277.5 |
| Linear Excursion (Xmax) | 104.0 mm |
| Thermal Power (Pe) | 70.0 W |
| Nominal Diameter | 4.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for SICA 4 L1 1 SL?
A simple ported box is not recommended for SICA 4 L1 1 SL: the textbook alignment (1.5 liters tuned to 126.4 Hz) needs a 378.6 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 4 L1 1 SL be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 0.42 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 230.0 Hz.
What port dimensions should be used for SICA 4 L1 1 SL to avoid port chuffing?
A straight 20.0 cm port would need 378.6 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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