B & C BAC15DS115A
Best box: 11.3 L bass reflex tuned to 116.1 Hz · F3 116.1 Hz
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Comparable 15.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the B & C BAC15DS115A 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 (8.7 L at 68.3 Hz) would need a 245.6 cm port; the recommendation is retuned to 11.3 L at 116.1 Hz so the port can be built.
- Port length (98.0 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) | 11.3 Liters |
| Tuning Frequency (Fb) | 116.1 Hz |
| F3 (-3 dB Cutoff) | 116.1 Hz |
| F6 / F10 Extension | 106.1 Hz / 94.7 Hz |
| Port Inner Diameter | Ø 27.6 cm |
| Port Physical Length | 98.0 cm |
| First Pipe Resonance | 176.0 Hz |
| Estimated MOL @ F3 | 128.1 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 5.8 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 133.9 Hz |
| F3 (-3 dB Cutoff) | 124.1 Hz |
| F6 / F10 Extension | 96.1 Hz / 73.0 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 33.0 Hz |
| Total Q (Qts) | 0.17 |
| Electrical Q (Qes) | 0.176 |
| Mechanical Q (Qms) | 5.2 |
| Equivalent Volume (Vas) | 94.0 Liters |
| Diaphragm Area (Sd) | 855.0 cm² |
| DC Resistance (Re) | 4.9 Ω |
| Efficiency Bandwidth Product (EBP) | 187.8 |
| Linear Excursion (Xmax) | 16.5 mm |
| Thermal Power (Pe) | 1700.0 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 BAC15DS115A?
Load Forge's calculated alignment puts B & C BAC15DS115A in a 11.3 liter vented enclosure tuned to 116.1 Hz, reaching an F3 cutoff of approximately 116.1 Hz.
Can B & C BAC15DS115A be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 5.8 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 124.1 Hz.
What port dimensions should be used for B & C BAC15DS115A to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 27.6 cm with a length of 98.0 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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