SICA 4 D 0.8 CS
Best box: 1.2 L sealed · Fc 198.0 Hz · F3 160.8 Hz
Open and tweak this box live ↗
Will it fit your requirements?
Check the SICA 4 D 0.8 CS against your space and targets — instant, no sign-up.
Estimated retail 22.00 EUR · Check price & availability ↗
Free, no sign-up to simulate · a free account saves your design
Comparable 4.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the SICA 4 D 0.8 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 429.0 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) | 1.5 Liters |
| Tuning Frequency (Fb) | 119.0 Hz |
| F3 (-3 dB Cutoff) | 151.2 Hz |
| F6 / F10 Extension | 124.1 Hz / 92.8 Hz |
| Port Inner Diameter | Ø 20.0 cm |
| Port Physical Length | 429.0 cm |
| First Pipe Resonance | 40.0 Hz |
| Estimated MOL @ F3 | 103.5 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.92 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 1.301; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 1.2 Liters |
| System Q (Qtc) | 1.301 (above Butterworth: Qtc cannot fall below Qts (0.92)) |
| System Resonance (Fc) | 198.0 Hz |
| F3 (-3 dB Cutoff) | 160.8 Hz |
| F6 / F10 Extension | 136.7 Hz / 112.2 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 140.0 Hz |
| Total Q (Qts) | 0.92 |
| Electrical Q (Qes) | 1.178 |
| Mechanical Q (Qms) | 4.2 |
| Equivalent Volume (Vas) | 1.2 Liters |
| Diaphragm Area (Sd) | 44.2 cm² |
| DC Resistance (Re) | 3.0 Ω |
| Efficiency Bandwidth Product (EBP) | 118.8 |
| Linear Excursion (Xmax) | 102.0 mm |
| Thermal Power (Pe) | 35.0 W |
| Nominal Diameter | 4.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for SICA 4 D 0.8 CS?
A simple ported box is not recommended for SICA 4 D 0.8 CS: the textbook alignment (1.5 liters tuned to 119.0 Hz) needs a 429.0 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 4 D 0.8 CS be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 1.2 liters with a Qtc of 1.301 (above Butterworth: Qtc cannot fall below Qts (0.92)), the system exhibits an F3 of 160.8 Hz.
What port dimensions should be used for SICA 4 D 0.8 CS to avoid port chuffing?
A straight 20.0 cm port would need 429.0 cm of length, which does not fit a practical cabinet. Use a passive radiator or a folded/3D duct instead of a straight tube.
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.
Not sure if 4 D 0.8 CS fits your physical space?
Don't force a driver into the wrong box. Use Bass Match to calculate which of 8,000+ catalog drivers delivers the highest SPL, lowest F3, and cleanest port air velocity for your exact trunk or room dimensions.
Run Bass Match for Your Space