SICA 3.5 F 1 CS
Best box: 3.7 L bass reflex tuned to 97.4 Hz · F3 88.4 Hz
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Comparable 3.5" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the SICA 3.5 F 1 CS 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 74.9 Hz) would need a 303.3 cm port; the recommendation is retuned to 3.7 L at 97.4 Hz so the port can be built.
- Port length (95.9 cm) exceeds a straight internal run; use an elbow bend, slotted vent or 3D folded duct to fit the enclosure.
Recommended Bass Reflex (Vented)
PORT NEEDS ELBOW / 3D| Net Box Volume (Vb) | 3.7 Liters |
| Tuning Frequency (Fb) | 97.4 Hz |
| F3 (-3 dB Cutoff) | 88.4 Hz |
| F6 / F10 Extension | 81.6 Hz / 74.3 Hz |
| Port Inner Diameter | Ø 12.5 cm |
| Port Physical Length | 95.9 cm |
| First Pipe Resonance | 179.0 Hz |
| Estimated MOL @ F3 | 103.4 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) | 130.3 Hz |
| F3 (-3 dB Cutoff) | 131.7 Hz |
| F6 / F10 Extension | 99.6 Hz / 75.3 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 107.0 Hz |
| Total Q (Qts) | 0.57 |
| Electrical Q (Qes) | 0.625 |
| Mechanical Q (Qms) | 6.52 |
| Equivalent Volume (Vas) | 1.4 Liters |
| Diaphragm Area (Sd) | 38.5 cm² |
| DC Resistance (Re) | 5.0 Ω |
| Efficiency Bandwidth Product (EBP) | 171.3 |
| Linear Excursion (Xmax) | 88.0 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 F 1 CS?
Load Forge's calculated alignment puts SICA 3.5 F 1 CS in a 3.7 liter vented enclosure tuned to 97.4 Hz, reaching an F3 cutoff of approximately 88.4 Hz.
Can SICA 3.5 F 1 CS 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 131.7 Hz.
What port dimensions should be used for SICA 3.5 F 1 CS to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 12.5 cm with a length of 95.9 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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