SICA P 8 R
Best box: 10.3 L sealed · Fc 190.9 Hz · F3 154.2 Hz
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Comparable 8.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the SICA P 8 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 (10.4 dB bass hump)
PORT BUILDABLE| Net Box Volume (Vb) | 8.2 Liters |
| Tuning Frequency (Fb) | 114.8 Hz |
| F3 (-3 dB Cutoff) | 182.6 Hz |
| F6 / F10 Extension | 167.4 Hz / 146.4 Hz |
| Port Inner Diameter ESTIMATED | Ø 6.8 cm |
| Port Physical Length | 5.2 cm |
| First Pipe Resonance | 3301.0 Hz |
| Estimated MOL @ F3 | 112.5 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 2.28 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 3.224; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 10.3 Liters |
| System Q (Qtc) | 3.224 (above Butterworth: Qtc cannot fall below Qts (2.28)) |
| System Resonance (Fc) | 190.9 Hz |
| F3 (-3 dB Cutoff) | 154.2 Hz |
| F6 / F10 Extension | 141.1 Hz / 124.6 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 135.0 Hz |
| Total Q (Qts) | 2.28 |
| Electrical Q (Qes) | 3.094 |
| Mechanical Q (Qms) | 8.67 |
| Equivalent Volume (Vas) | 10.3 Liters |
| Diaphragm Area (Sd) | 213.8 cm² |
| DC Resistance (Re) | 6.6 Ω |
| Efficiency Bandwidth Product (EBP) | 43.6 |
| Linear Excursion (Xmax) | N/A mm |
| Thermal Power (Pe) | 25.0 W |
| Nominal Diameter | 8.0" |
| 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 8 R?
A simple ported box is not recommended for SICA P 8 R: the textbook alignment (8.2 liters tuned to 114.8 Hz) needs a 5.2 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 8 R be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 10.3 liters with a Qtc of 3.224 (above Butterworth: Qtc cannot fall below Qts (2.28)), the system exhibits an F3 of 154.2 Hz.
What port dimensions should be used for SICA P 8 R to avoid port chuffing?
A straight 6.8 cm port would need 5.2 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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