SICA P 12 R
Best box: 54.0 L sealed · Fc 113.1 Hz · F3 89.6 Hz
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Comparable 12.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the SICA P 12 R 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.
Textbook Bass Reflex — not recommended (3.2 dB bass hump)
PORT BUILDABLE| Net Box Volume (Vb) | 43.2 Liters |
| Tuning Frequency (Fb) | 68.0 Hz |
| F3 (-3 dB Cutoff) | 106.2 Hz |
| F6 / F10 Extension | 97.0 Hz / 84.3 Hz |
| Port Inner Diameter ESTIMATED | Ø 12.5 cm |
| Port Physical Length | 9.5 cm |
| First Pipe Resonance | 1815.0 Hz |
| Estimated MOL @ F3 | 113.0 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 2.1 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 2.97; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 54.0 Liters |
| System Q (Qtc) | 2.97 (above Butterworth: Qtc cannot fall below Qts (2.10)) |
| System Resonance (Fc) | 113.1 Hz |
| F3 (-3 dB Cutoff) | 89.6 Hz |
| F6 / F10 Extension | 81.6 Hz / 71.6 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 80.0 Hz |
| Total Q (Qts) | 2.1 |
| Electrical Q (Qes) | 2.502 |
| Mechanical Q (Qms) | 13.07 |
| Equivalent Volume (Vas) | 54.0 Liters |
| Diaphragm Area (Sd) | 490.9 cm² |
| DC Resistance (Re) | 6.05 Ω |
| Efficiency Bandwidth Product (EBP) | 32.0 |
| Linear Excursion (Xmax) | N/A mm |
| Thermal Power (Pe) | 25.0 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 P 12 R?
A simple ported box is not recommended for SICA P 12 R: the textbook alignment (43.2 liters tuned to 68.0 Hz) needs a 9.5 cm port, and no nearby retune stays buildable without a bass hump. A sealed box, a passive radiator or a folded duct is the practical choice.
Can SICA P 12 R be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 54.0 liters with a Qtc of 2.97 (above Butterworth: Qtc cannot fall below Qts (2.10)), the system exhibits an F3 of 89.6 Hz.
What port dimensions should be used for SICA P 12 R to avoid port chuffing?
A straight 12.5 cm port would need 9.5 cm of length, which does not fit a practical cabinet. Use a passive radiator or a folded/3D duct instead of a straight tube.
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