Reflex Optimized
B&C Speakers 8MBX51 16Ω
Complete Thiele/Small parameters, optimized ported (bass reflex) and sealed enclosure designs, F3/F6/F10 cutoffs, and vent turbulence analysis calculated by Load Forge.
Recommended Bass Reflex (Vented)
OPTIMIZED EXTENSION| Net Box Volume (Vb) | 20.5 Liters |
| Tuning Frequency (Fb) | 68.2 Hz |
| F3 (-3 dB Cutoff) | 64.2 Hz |
| F6 / F10 Extension | 57.8 Hz / 51.4 Hz |
| Port Inner Diameter | Ø 6.8 cm |
| Port Physical Length | 6.6 cm |
| First Pipe Resonance | 2624.0 Hz |
| Estimated MOL @ F3 | 112.9 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 8.9 Liters |
| System Q (Qtc) | 0.707 (Butterworth Q=0.707) |
| System Resonance (Fc) | 121.2 Hz |
| F3 (-3 dB Cutoff) | 114.0 Hz |
| F6 / F10 Extension | 87.0 Hz / 65.6 Hz |
| Air Spring Linearity | High (Zero port compression) |
Verified Thiele/Small Parameters
| Resonance (Fs) | 68.0 Hz |
| Total Q (Qts) | 0.38 |
| Electrical Q (Qes) | 0.429 |
| Mechanical Q (Qms) | 3.3 |
| Equivalent Volume (Vas) | 22.0 Liters |
| Diaphragm Area (Sd) | 220.0 cm² |
| DC Resistance (Re) | 10.2 Ω |
| Efficiency Bandwidth Product (EBP) | 158.3 |
| Linear Excursion (Xmax) | 6.0 mm |
| Thermal Power (Pe) | 200.0 W |
| Nominal Diameter | 8.0" |
| Catalog Source | Manufacturer Official Datasheet |
Shareable Acoustic Card for Forums & Social Media
Embed this verified design card on DIYAudio, AVSForum, Reddit, or Facebook. Includes verified F3, MOL, and box parameters.
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