SICA 8 H 1.5 CS
Best box: 26.9 L sealed · Fc 71.4 Hz · F3 59.2 Hz
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Comparable 8.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the SICA 8 H 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 507.0 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) | 21.5 Liters |
| Tuning Frequency (Fb) | 42.9 Hz |
| F3 (-3 dB Cutoff) | 60.9 Hz |
| F6 / F10 Extension | 50.5 Hz / 38.7 Hz |
| Port Inner Diameter | Ø 29.8 cm |
| Port Physical Length | 507.0 cm |
| First Pipe Resonance | 34.0 Hz |
| Estimated MOL @ F3 | 107.4 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.72 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 1.018; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 26.9 Liters |
| System Q (Qtc) | 1.018 (above Butterworth: Qtc cannot fall below Qts (0.72)) |
| System Resonance (Fc) | 71.4 Hz |
| F3 (-3 dB Cutoff) | 59.2 Hz |
| F6 / F10 Extension | 48.8 Hz / 39.0 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 50.5 Hz |
| Total Q (Qts) | 0.72 |
| Electrical Q (Qes) | 0.949 |
| Mechanical Q (Qms) | 2.98 |
| Equivalent Volume (Vas) | 26.9 Liters |
| Diaphragm Area (Sd) | 213.8 cm² |
| DC Resistance (Re) | 6.1 Ω |
| Efficiency Bandwidth Product (EBP) | 53.2 |
| Linear Excursion (Xmax) | 208.0 mm |
| Thermal Power (Pe) | 100.0 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 8 H 1.5 CS?
A simple ported box is not recommended for SICA 8 H 1.5 CS: the textbook alignment (21.5 liters tuned to 42.9 Hz) needs a 507.0 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 8 H 1.5 CS be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 26.9 liters with a Qtc of 1.018 (above Butterworth: Qtc cannot fall below Qts (0.72)), the system exhibits an F3 of 59.2 Hz.
What port dimensions should be used for SICA 8 H 1.5 CS to avoid port chuffing?
A straight 29.8 cm port would need 507.0 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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