B&C Speakers B&C 15SW115-4 15" Professional Neodymium Subwoofer 4 Ohm
Best box: 20.4 L bass reflex tuned to 64.2 Hz · F3 68.3 Hz
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Comparable 15.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the B&C Speakers B&C 15SW115-4 15" Professional Neodymium Subwoofer 4 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 (20.4 L at 55.8 Hz) would need a 134.0 cm port; the recommendation is retuned to 20.4 L at 64.2 Hz so the port can be built.
- Port length (97.7 cm) exceeds a straight internal run; use an elbow bend, slotted vent or 3D folded duct to fit the enclosure.
Recommended Bass Reflex (Vented)
PORT NEEDS ELBOW / 3D| Net Box Volume (Vb) | 20.4 Liters |
| Tuning Frequency (Fb) | 64.2 Hz |
| F3 (-3 dB Cutoff) | 68.3 Hz |
| F6 / F10 Extension | 60.1 Hz / 52.0 Hz |
| Port Inner Diameter | Ø 20.0 cm |
| Port Physical Length | 97.7 cm |
| First Pipe Resonance | 176.0 Hz |
| Estimated MOL @ F3 | 126.3 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 11.2 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 106.1 Hz |
| F3 (-3 dB Cutoff) | 105.6 Hz |
| F6 / F10 Extension | 80.1 Hz / 60.3 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 34.0 Hz |
| Total Q (Qts) | 0.22 |
| Electrical Q (Qes) | 0.229 |
| Mechanical Q (Qms) | 5.8 |
| Equivalent Volume (Vas) | 104.8 Liters |
| Diaphragm Area (Sd) | 855.0 cm² |
| DC Resistance (Re) | 3.2 Ω |
| Efficiency Bandwidth Product (EBP) | 148.7 |
| Linear Excursion (Xmax) | 13.5 mm |
| Thermal Power (Pe) | 3400.0 W |
| Nominal Diameter | 15.0" |
| 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 15SW115-4 15" Professional Neodymium Subwoofer 4 Ohm?
Load Forge's calculated alignment puts B&C Speakers B&C 15SW115-4 15" Professional Neodymium Subwoofer 4 Ohm in a 20.4 liter vented enclosure tuned to 64.2 Hz, reaching an F3 cutoff of approximately 68.3 Hz.
Can B&C Speakers B&C 15SW115-4 15" Professional Neodymium Subwoofer 4 Ohm be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 11.2 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 105.6 Hz.
What port dimensions should be used for B&C Speakers B&C 15SW115-4 15" Professional Neodymium Subwoofer 4 Ohm to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 20.0 cm with a length of 97.7 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 15SW115-4 15" Professional Neodymium Subwoofer 4 Ohm fits your physical space?
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