SICA 3 L 0.8 SL
Best box: 2.0 L bass reflex tuned to 135.5 Hz · F3 132.2 Hz
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Comparable 3.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the SICA 3 L 0.8 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
- The textbook alignment (1.5 L at 123.2 Hz) would need a 152.6 cm port; the recommendation is retuned to 2.0 L at 135.5 Hz so the port can be built.
- Port length (91.2 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) | 2.0 Liters |
| Tuning Frequency (Fb) | 135.5 Hz |
| F3 (-3 dB Cutoff) | 132.2 Hz |
| F6 / F10 Extension | 114.1 Hz / 101.3 Hz |
| Port Inner Diameter | Ø 12.5 cm |
| Port Physical Length | 91.2 cm |
| First Pipe Resonance | 189.0 Hz |
| Estimated MOL @ F3 | 101.9 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 1.01 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 1.428; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 0.8 Liters |
| System Q (Qtc) | 1.428 (above Butterworth: Qtc cannot fall below Qts (1.01)) |
| System Resonance (Fc) | 205.1 Hz |
| F3 (-3 dB Cutoff) | 167.3 Hz |
| F6 / F10 Extension | 143.8 Hz / 119.1 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 145.0 Hz |
| Total Q (Qts) | 1.01 |
| Electrical Q (Qes) | 1.271 |
| Mechanical Q (Qms) | 4.92 |
| Equivalent Volume (Vas) | 0.8 Liters |
| Diaphragm Area (Sd) | 30.2 cm² |
| DC Resistance (Re) | 5.5 Ω |
| Efficiency Bandwidth Product (EBP) | 114.1 |
| Linear Excursion (Xmax) | 80.0 mm |
| Thermal Power (Pe) | 20.0 W |
| Nominal Diameter | 3.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for SICA 3 L 0.8 SL?
Load Forge's calculated alignment puts SICA 3 L 0.8 SL in a 2.0 liter vented enclosure tuned to 135.5 Hz, reaching an F3 cutoff of approximately 132.2 Hz.
Can SICA 3 L 0.8 SL be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 0.8 liters with a Qtc of 1.428 (above Butterworth: Qtc cannot fall below Qts (1.01)), the system exhibits an F3 of 167.3 Hz.
What port dimensions should be used for SICA 3 L 0.8 SL to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 12.5 cm with a length of 91.2 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
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