SICA C 12 K2
Best box: 64.7 L bass reflex tuned to 65.5 Hz · F3 60.3 Hz
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Comparable 12.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the SICA C 12 K2 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
- 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) | 64.7 Liters |
| Tuning Frequency (Fb) | 65.5 Hz |
| F3 (-3 dB Cutoff) | 60.3 Hz |
| F6 / F10 Extension | 54.4 Hz / 48.6 Hz |
| Port Inner Diameter ESTIMATED | Ø 20.0 cm |
| Port Physical Length | 19.6 cm |
| First Pipe Resonance | 876.0 Hz |
| Estimated MOL @ F3 | 114.5 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 34.1 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 109.8 Hz |
| F3 (-3 dB Cutoff) | 111.2 Hz |
| F6 / F10 Extension | 83.9 Hz / 63.3 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 79.0 Hz |
| Total Q (Qts) | 0.47 |
| Electrical Q (Qes) | 0.489 |
| Mechanical Q (Qms) | 12.07 |
| Equivalent Volume (Vas) | 43.1 Liters |
| Diaphragm Area (Sd) | 490.9 cm² |
| DC Resistance (Re) | 6.7 Ω |
| Efficiency Bandwidth Product (EBP) | 161.5 |
| Linear Excursion (Xmax) | N/A mm |
| Thermal Power (Pe) | 100.0 W |
| Nominal Diameter | 12.0" |
| 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 12 K2?
Load Forge's calculated alignment puts SICA C 12 K2 in a 64.7 liter vented enclosure tuned to 65.5 Hz, reaching an F3 cutoff of approximately 60.3 Hz.
Can SICA C 12 K2 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 34.1 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 111.2 Hz.
What port dimensions should be used for SICA C 12 K2 to avoid port chuffing?
Xmax is not published for SICA C 12 K2, so the port is an empirical estimate: a 20.0 cm diameter with a length of 19.6 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
Embed this design card on DIYAudio, AVSForum, Reddit, or Facebook. It shows the calculated F3, MOL (when the power rating is published) and box parameters.
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