SICA 3,5 L 1 SL - 8
Best box: 2.1 L bass reflex tuned to 79.4 Hz · F3 89.8 Hz
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Comparable 3.5" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the SICA 3,5 L 1 SL - 8 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
- The textbook alignment (2.1 L at 75.6 Hz) would need a 45.5 cm port; the recommendation is retuned to 2.1 L at 79.4 Hz so the port can be built.
- Limited linear excursion (Xmax: 1.5 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) | 2.1 Liters |
| Tuning Frequency (Fb) | 79.4 Hz |
| F3 (-3 dB Cutoff) | 89.8 Hz |
| F6 / F10 Extension | 69.4 Hz / 60.1 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 40.9 cm |
| First Pipe Resonance | 421.0 Hz |
| Estimated MOL @ F3 | 96.8 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 2.6 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 131.6 Hz |
| F3 (-3 dB Cutoff) | 132.9 Hz |
| F6 / F10 Extension | 100.4 Hz / 75.8 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 108.0 Hz |
| Total Q (Qts) | 0.57 |
| Electrical Q (Qes) | 0.615 |
| Mechanical Q (Qms) | 7.83 |
| Equivalent Volume (Vas) | 1.4 Liters |
| Diaphragm Area (Sd) | 38.5 cm² |
| DC Resistance (Re) | 5.0 Ω |
| Efficiency Bandwidth Product (EBP) | 175.7 |
| Linear Excursion (Xmax) | 1.5 mm |
| Thermal Power (Pe) | 45.0 W |
| Nominal Diameter | 3.5" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for SICA 3,5 L 1 SL - 8?
Load Forge's calculated alignment puts SICA 3,5 L 1 SL - 8 in a 2.1 liter vented enclosure tuned to 79.4 Hz, reaching an F3 cutoff of approximately 89.8 Hz.
Can SICA 3,5 L 1 SL - 8 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 2.6 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 132.9 Hz.
What port dimensions should be used for SICA 3,5 L 1 SL - 8 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 40.9 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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