B&C Speakers B&C 4NDF34-8 4" Professional Neodymium Woofer 8 Ohm
Best box: 1.5 L bass reflex tuned to 150.1 Hz · F3 140.2 Hz
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Comparable 4.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the B&C Speakers B&C 4NDF34-8 4" Professional Neodymium Woofer 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: 3.8 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) | 1.5 Liters |
| Tuning Frequency (Fb) | 150.1 Hz |
| F3 (-3 dB Cutoff) | 140.2 Hz |
| F6 / F10 Extension | 130.3 Hz / 118.4 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 13.8 cm |
| First Pipe Resonance | 1243.0 Hz |
| Estimated MOL @ F3 | 112.2 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 0.29 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 283.0 Hz |
| F3 (-3 dB Cutoff) | 261.7 Hz |
| F6 / F10 Extension | 200.1 Hz / 150.9 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 110.0 Hz |
| Total Q (Qts) | 0.27 |
| Electrical Q (Qes) | 0.289 |
| Mechanical Q (Qms) | 4.2 |
| Equivalent Volume (Vas) | 1.7 Liters |
| Diaphragm Area (Sd) | 57.0 cm² |
| DC Resistance (Re) | 5.5 Ω |
| Efficiency Bandwidth Product (EBP) | 381.2 |
| Linear Excursion (Xmax) | 3.8 mm |
| Thermal Power (Pe) | 200.0 W |
| Nominal Diameter | 4.0" |
| 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 4NDF34-8 4" Professional Neodymium Woofer 8 Ohm?
Load Forge's calculated alignment puts B&C Speakers B&C 4NDF34-8 4" Professional Neodymium Woofer 8 Ohm in a 1.5 liter vented enclosure tuned to 150.1 Hz, reaching an F3 cutoff of approximately 140.2 Hz.
Can B&C Speakers B&C 4NDF34-8 4" Professional Neodymium Woofer 8 Ohm be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 0.29 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 261.7 Hz.
What port dimensions should be used for B&C Speakers B&C 4NDF34-8 4" Professional Neodymium Woofer 8 Ohm to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 13.8 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
Shareable Acoustic Card for Forums & Social Media
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Not sure if B&C 4NDF34-8 4" Professional Neodymium Woofer 8 Ohm fits your physical space?
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