B&C Speakers 6CLA51 16Ω
Best box: 6.6 L bass reflex tuned to 83.4 Hz · F3 78.4 Hz
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Comparable 6.5" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the B&C Speakers 6CLA51 16Ω does not fit your target box volume or tuning. Each entry links to its full enclosure design and Thiele/Small parameters.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 6.6 Liters |
| Tuning Frequency (Fb) | 83.4 Hz |
| F3 (-3 dB Cutoff) | 78.4 Hz |
| F6 / F10 Extension | 70.3 Hz / 62.5 Hz |
| Port Inner Diameter | Ø 6.8 cm |
| Port Physical Length | 18.9 cm |
| First Pipe Resonance | 912.0 Hz |
| Estimated MOL @ F3 | 111.8 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 2.9 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 149.4 Hz |
| F3 (-3 dB Cutoff) | 148.9 Hz |
| F6 / F10 Extension | 112.8 Hz / 85.2 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 89.0 Hz |
| Total Q (Qts) | 0.41 |
| Electrical Q (Qes) | 0.458 |
| Mechanical Q (Qms) | 3.9 |
| Equivalent Volume (Vas) | 5.7 Liters |
| Diaphragm Area (Sd) | 132.0 cm² |
| DC Resistance (Re) | 9.7 Ω |
| Efficiency Bandwidth Product (EBP) | 194.3 |
| Linear Excursion (Xmax) | 5.5 mm |
| Thermal Power (Pe) | 250.0 W |
| Nominal Diameter | 6.5" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for B&C Speakers 6CLA51 16Ω?
Load Forge's calculated alignment puts B&C Speakers 6CLA51 16Ω in a 6.6 liter vented enclosure tuned to 83.4 Hz, reaching an F3 cutoff of approximately 78.4 Hz.
Can B&C Speakers 6CLA51 16Ω be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 2.9 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 148.9 Hz.
What port dimensions should be used for B&C Speakers 6CLA51 16Ω to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 6.8 cm with a length of 18.9 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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