Infinity KAPPA CS-120BR
Best box: 286.4 L bass reflex tuned to 22.4 Hz · F3 20.8 Hz
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Comparable 12.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Infinity KAPPA CS-120BR 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
- Large enclosure volume (286.4 L) requires extensive internal matrix bracing to prevent panel resonance.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 286.4 Liters |
| Tuning Frequency (Fb) | 22.4 Hz |
| F3 (-3 dB Cutoff) | 20.8 Hz |
| F6 / F10 Extension | 18.8 Hz / 16.7 Hz |
| Port Inner Diameter | Ø 6.8 cm |
| Port Physical Length | 2.7 cm |
| First Pipe Resonance | 6339.0 Hz |
| Estimated MOL @ F3 | 108.9 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 126.3 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 39.5 Hz |
| F3 (-3 dB Cutoff) | 40.5 Hz |
| F6 / F10 Extension | 30.5 Hz / 23.0 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 25.0 Hz |
| Total Q (Qts) | 0.43 |
| Electrical Q (Qes) | 0.452 |
| Mechanical Q (Qms) | 8.73 |
| Equivalent Volume (Vas) | 215.2 Liters |
| Diaphragm Area (Sd) | 530.0 cm² |
| DC Resistance (Re) | 3.6 Ω |
| Efficiency Bandwidth Product (EBP) | 55.3 |
| Linear Excursion (Xmax) | 6.7 mm |
| Thermal Power (Pe) | 250.0 W |
| Nominal Diameter | 12.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Infinity KAPPA CS-120BR?
Load Forge's calculated alignment puts Infinity KAPPA CS-120BR in a 286.4 liter vented enclosure tuned to 22.4 Hz, reaching an F3 cutoff of approximately 20.8 Hz.
Can Infinity KAPPA CS-120BR be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 126.3 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 40.5 Hz.
What port dimensions should be used for Infinity KAPPA CS-120BR to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 6.8 cm with a length of 2.7 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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