B&C Speakers B&C 4CXN36 4" Professional Coaxial Speaker 70 x 70 8 Ohm
Best box: 1.6 L bass reflex tuned to 87.9 Hz · F3 115.0 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 4CXN36 4" Professional Coaxial Speaker 70 x 70 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
- The textbook alignment (1.6 L at 79.9 Hz) would need a 54.0 cm port; the recommendation is retuned to 1.6 L at 87.9 Hz so the port can be built.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 1.6 Liters |
| Tuning Frequency (Fb) | 87.9 Hz |
| F3 (-3 dB Cutoff) | 115.0 Hz |
| F6 / F10 Extension | 96.2 Hz / 75.1 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 44.0 cm |
| First Pipe Resonance | 391.0 Hz |
| Estimated MOL @ F3 | 108.2 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.76 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 1.075; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 2.0 Liters |
| System Q (Qtc) | 1.075 (above Butterworth: Qtc cannot fall below Qts (0.76)) |
| System Resonance (Fc) | 132.9 Hz |
| F3 (-3 dB Cutoff) | 110.0 Hz |
| F6 / F10 Extension | 91.1 Hz / 73.2 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 94.0 Hz |
| Total Q (Qts) | 0.76 |
| Electrical Q (Qes) | 0.799 |
| Mechanical Q (Qms) | 15.75 |
| Equivalent Volume (Vas) | 2.0 Liters |
| Diaphragm Area (Sd) | 56.0 cm² |
| DC Resistance (Re) | 5.4 Ω |
| Efficiency Bandwidth Product (EBP) | 117.7 |
| Linear Excursion (Xmax) | 4.0 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 4CXN36 4" Professional Coaxial Speaker 70 x 70 8 Ohm?
Load Forge's calculated alignment puts B&C Speakers B&C 4CXN36 4" Professional Coaxial Speaker 70 x 70 8 Ohm in a 1.6 liter vented enclosure tuned to 87.9 Hz, reaching an F3 cutoff of approximately 115.0 Hz.
Can B&C Speakers B&C 4CXN36 4" Professional Coaxial Speaker 70 x 70 8 Ohm be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 2.0 liters with a Qtc of 1.075 (above Butterworth: Qtc cannot fall below Qts (0.76)), the system exhibits an F3 of 110.0 Hz.
What port dimensions should be used for B&C Speakers B&C 4CXN36 4" Professional Coaxial Speaker 70 x 70 8 Ohm to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 44.0 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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