Passive Radiator / Folded Port

SICA 10 N 2.5 PL

Best box: 14.3 L sealed · Fc 106.7 Hz · F3 106.2 Hz

Predicted SPL response of the SICA 10 N 2.5 PL in the recommended 14.3 L sealed box versus the alternative — open it in the simulator Open and tweak this box live ↗

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⚠️ Engineering Notice for Builders

  • Straight vent would be 481.7 cm long: not physically buildable as a simple tube. Use a passive radiator, a folded slot port or model a 3D folded duct in Load Forge Studio.

Textbook Bass Reflex — not recommended

PORT NOT BUILDABLE
Net Box Volume (Vb) 32.7 Liters
Tuning Frequency (Fb) 60.0 Hz
F3 (-3 dB Cutoff) 58.1 Hz
F6 / F10 Extension 51.8 Hz / 45.6 Hz
Port Inner Diameter Ø 50.9 cm
Port Physical Length 481.7 cm
First Pipe Resonance 36.0 Hz
Estimated MOL @ F3 115.5 dB SPL
⚠️ Port feasibility: a straight tube would need 481.7 cm and cannot fit in a practical cabinet, and no nearby retune stays buildable without a bass hump. Prefer the sealed alignment, a passive radiator, or a 3D folded duct in Load Forge Studio.
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Recommended Sealed (Acoustic Suspension)

MAX TRANSIENT DAMPING
Net Box Volume (Vb) 14.3 Liters
System Q (Qtc) 0.707 (Butterworth)
System Resonance (Fc) 106.7 Hz
F3 (-3 dB Cutoff) 106.2 Hz
F6 / F10 Extension 80.4 Hz / 60.7 Hz
Air Spring Linearity High (Zero port compression)
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Thiele/Small Parameters

Resonance (Fs) 57.0 Hz
Total Q (Qts) 0.36
Electrical Q (Qes) 0.393
Mechanical Q (Qms) 4.25
Equivalent Volume (Vas) 40.9 Liters
Diaphragm Area (Sd) 346.4 cm²
DC Resistance (Re) 5.5 Ω
Efficiency Bandwidth Product (EBP) 144.9
Linear Excursion (Xmax) 268.0 mm
Thermal Power (Pe) 300.0 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 10 N 2.5 PL?

A simple ported box is not recommended for SICA 10 N 2.5 PL: the textbook alignment (32.7 liters tuned to 60.0 Hz) needs a 481.7 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 10 N 2.5 PL be used in a sealed box?

Yes. In a sealed (acoustic suspension) enclosure of 14.3 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 106.2 Hz.

What port dimensions should be used for SICA 10 N 2.5 PL to avoid port chuffing?

A straight 50.9 cm port would need 481.7 cm of length, which does not fit a practical cabinet. Use a passive radiator or a folded/3D duct instead of a straight tube.

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.

SICA 10 N 2.5 PL Enclosure Card
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