SICA 6M1.5CP-8
Best box: 6.0 L bass reflex tuned to 102.2 Hz · F3 119.3 Hz
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Comparable 6.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the SICA 6M1.5CP-8 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
- The textbook alignment (2.4 L at 113.6 Hz) would need a 15.4 cm port; the recommendation is retuned to 6.0 L at 102.2 Hz so the port can be built.
- Limited linear excursion (Xmax: 2.3 mm); set a high-pass subsonic filter at 25–30 Hz when driven with high power.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 6.0 Liters |
| Tuning Frequency (Fb) | 102.2 Hz |
| F3 (-3 dB Cutoff) | 119.3 Hz |
| F6 / F10 Extension | 89.1 Hz / 76.5 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 5.8 cm |
| First Pipe Resonance | 2957.0 Hz |
| Estimated MOL @ F3 | 109.6 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) | 3.0 Liters |
| System Q (Qtc) | 1.301 (above Butterworth: Qtc cannot fall below Qts (0.92)) |
| System Resonance (Fc) | 188.9 Hz |
| F3 (-3 dB Cutoff) | 154.1 Hz |
| F6 / F10 Extension | 131.1 Hz / 107.7 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 133.6 Hz |
| Total Q (Qts) | 0.92 |
| Electrical Q (Qes) | 1.29 |
| Mechanical Q (Qms) | 3.21 |
| Equivalent Volume (Vas) | 3.0 Liters |
| Diaphragm Area (Sd) | 122.7 cm² |
| DC Resistance (Re) | 6.19 Ω |
| Efficiency Bandwidth Product (EBP) | 103.6 |
| Linear Excursion (Xmax) | 2.3 mm |
| Thermal Power (Pe) | 80.0 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 6M1.5CP-8?
Load Forge's calculated alignment puts SICA 6M1.5CP-8 in a 6.0 liter vented enclosure tuned to 102.2 Hz, reaching an F3 cutoff of approximately 119.3 Hz.
Can SICA 6M1.5CP-8 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 3.0 liters with a Qtc of 1.301 (above Butterworth: Qtc cannot fall below Qts (0.92)), the system exhibits an F3 of 154.1 Hz.
What port dimensions should be used for SICA 6M1.5CP-8 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 5.8 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
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.
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