SICA C 10/40 FA
Best box: 16.4 L bass reflex tuned to 58.3 Hz · F3 127.3 Hz
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Comparable 10.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the SICA C 10/40 FA 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 (13.1 L at 97.2 Hz) would need a 5.3 cm port; the recommendation is retuned to 16.4 L at 58.3 Hz so the port can be built.
- Xmax is not published, so the port size is an empirical estimate (area ≥ 12 in² per ft³ of net volume, minimum by driver size), not a displacement calculation. Check air velocity in Load Forge Studio.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 16.4 Liters |
| Tuning Frequency (Fb) | 58.3 Hz |
| F3 (-3 dB Cutoff) | 127.3 Hz |
| F6 / F10 Extension | 109.4 Hz / 88.8 Hz |
| Port Inner Diameter ESTIMATED | Ø 10.0 cm |
| Port Physical Length | 35.1 cm |
| First Pipe Resonance | 490.0 Hz |
| Estimated MOL @ F3 | 111.4 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 1.15 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 1.626; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 16.4 Liters |
| System Q (Qtc) | 1.626 (above Butterworth: Qtc cannot fall below Qts (1.15)) |
| System Resonance (Fc) | 161.8 Hz |
| F3 (-3 dB Cutoff) | 126.1 Hz |
| F6 / F10 Extension | 109.8 Hz / 92.1 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 114.4 Hz |
| Total Q (Qts) | 1.15 |
| Electrical Q (Qes) | 1.243 |
| Mechanical Q (Qms) | 15.37 |
| Equivalent Volume (Vas) | 16.4 Liters |
| Diaphragm Area (Sd) | 330.1 cm² |
| DC Resistance (Re) | 6.16 Ω |
| Efficiency Bandwidth Product (EBP) | 92.0 |
| Linear Excursion (Xmax) | N/A mm |
| Thermal Power (Pe) | 40.0 W |
| Nominal Diameter | 10.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for SICA C 10/40 FA?
Load Forge's calculated alignment puts SICA C 10/40 FA in a 16.4 liter vented enclosure tuned to 58.3 Hz, reaching an F3 cutoff of approximately 127.3 Hz.
Can SICA C 10/40 FA be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 16.4 liters with a Qtc of 1.626 (above Butterworth: Qtc cannot fall below Qts (1.15)), the system exhibits an F3 of 126.1 Hz.
What port dimensions should be used for SICA C 10/40 FA to avoid port chuffing?
Xmax is not published for SICA C 10/40 FA, so the port is an empirical estimate: a 10.0 cm diameter with a length of 35.1 cm (area at least 12 in² per ft³ of net volume). Check the air velocity at your power level in Load Forge Studio.
Shareable Acoustic Card for Forums & Social Media
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