SICA 6 D 1.5 CS
Best box: 4.4 L sealed · Fc 153.4 Hz · F3 131.5 Hz
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Comparable 6.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the SICA 6 D 1.5 CS 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
- Straight vent would be 667.5 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) | 3.5 Liters |
| Tuning Frequency (Fb) | 92.2 Hz |
| F3 (-3 dB Cutoff) | 127.4 Hz |
| F6 / F10 Extension | 103.7 Hz / 79.6 Hz |
| Port Inner Diameter | Ø 29.5 cm |
| Port Physical Length | 667.5 cm |
| First Pipe Resonance | 26.0 Hz |
| Estimated MOL @ F3 | 109.5 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.63 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 0.891; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 4.4 Liters |
| System Q (Qtc) | 0.891 (above Butterworth) |
| System Resonance (Fc) | 153.4 Hz |
| F3 (-3 dB Cutoff) | 131.5 Hz |
| F6 / F10 Extension | 105.9 Hz / 83.3 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 108.5 Hz |
| Total Q (Qts) | 0.63 |
| Electrical Q (Qes) | 0.784 |
| Mechanical Q (Qms) | 3.21 |
| Equivalent Volume (Vas) | 4.4 Liters |
| Diaphragm Area (Sd) | 122.7 cm² |
| DC Resistance (Re) | 6.0 Ω |
| Efficiency Bandwidth Product (EBP) | 138.4 |
| Linear Excursion (Xmax) | 165.0 mm |
| Thermal Power (Pe) | 100.0 W |
| Nominal Diameter | 6.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for SICA 6 D 1.5 CS?
A simple ported box is not recommended for SICA 6 D 1.5 CS: the textbook alignment (3.5 liters tuned to 92.2 Hz) needs a 667.5 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 6 D 1.5 CS be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 4.4 liters with a Qtc of 0.891 (above Butterworth), the system exhibits an F3 of 131.5 Hz.
What port dimensions should be used for SICA 6 D 1.5 CS to avoid port chuffing?
A straight 29.5 cm port would need 667.5 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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