B&C Speakers B&C 8NSM64-8 8" Professional Neodymium Sealed Back Midrange 8 Ohm
Best box: 0.43 L sealed · Fc 488.6 Hz · F3 493.6 Hz
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Comparable 8.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the B&C Speakers B&C 8NSM64-8 8" Professional Neodymium Sealed Back Midrange 8 Ohm 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
- Limited linear excursion (Xmax: 2.0 mm); set a high-pass subsonic filter at 25–30 Hz when driven with high power.
Textbook Bass Reflex — not recommended (11.9 dB bass hump)
PORT BUILDABLE| Net Box Volume (Vb) | 1.5 Liters |
| Tuning Frequency (Fb) | 271.7 Hz |
| F3 (-3 dB Cutoff) | 253.7 Hz |
| F6 / F10 Extension | 231.9 Hz / 208.0 Hz |
| Port Inner Diameter | Ø 7.5 cm |
| Port Physical Length | 6.6 cm |
| First Pipe Resonance | 2607.0 Hz |
| Estimated MOL @ F3 | 123.8 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 0.43 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 488.6 Hz |
| F3 (-3 dB Cutoff) | 493.6 Hz |
| F6 / F10 Extension | 375.7 Hz / 284.0 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 245.0 Hz |
| Total Q (Qts) | 0.34 |
| Electrical Q (Qes) | 0.353 |
| Mechanical Q (Qms) | 9.3 |
| Equivalent Volume (Vas) | 1.4 Liters |
| Diaphragm Area (Sd) | 220.0 cm² |
| DC Resistance (Re) | 5.7 Ω |
| Efficiency Bandwidth Product (EBP) | 694.2 |
| Linear Excursion (Xmax) | 2.0 mm |
| Thermal Power (Pe) | 500.0 W |
| Nominal Diameter | 8.0" |
| 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 B&C 8NSM64-8 8" Professional Neodymium Sealed Back Midrange 8 Ohm?
A simple ported box is not recommended for B&C Speakers B&C 8NSM64-8 8" Professional Neodymium Sealed Back Midrange 8 Ohm: the textbook alignment (1.5 liters tuned to 271.7 Hz) needs a 6.6 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 B&C Speakers B&C 8NSM64-8 8" Professional Neodymium Sealed Back Midrange 8 Ohm be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 0.43 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 493.6 Hz.
What port dimensions should be used for B&C Speakers B&C 8NSM64-8 8" Professional Neodymium Sealed Back Midrange 8 Ohm to avoid port chuffing?
A straight 7.5 cm port would need 6.6 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
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