B&C Speakers B&C 6PEV13 6-1/2" Midrange Speaker
Best box: 4.8 L bass reflex tuned to 132.7 Hz · F3 131.0 Hz
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Comparable 6.5" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the B&C Speakers B&C 6PEV13 6-1/2" Midrange Speaker 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: 2.5 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) | 4.8 Liters |
| Tuning Frequency (Fb) | 132.7 Hz |
| F3 (-3 dB Cutoff) | 131.0 Hz |
| F6 / F10 Extension | 116.1 Hz / 102.0 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 3.4 cm |
| First Pipe Resonance | 5077.0 Hz |
| Estimated MOL @ F3 | 117.0 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 2.1 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 232.9 Hz |
| F3 (-3 dB Cutoff) | 242.6 Hz |
| F6 / F10 Extension | 183.0 Hz / 137.6 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 126.0 Hz |
| Total Q (Qts) | 0.36 |
| Electrical Q (Qes) | 0.391 |
| Mechanical Q (Qms) | 4.6 |
| Equivalent Volume (Vas) | 5.9 Liters |
| Diaphragm Area (Sd) | 132.0 cm² |
| DC Resistance (Re) | 5.2 Ω |
| Efficiency Bandwidth Product (EBP) | 322.6 |
| Linear Excursion (Xmax) | 2.5 mm |
| Thermal Power (Pe) | 240.0 W |
| Nominal Diameter | 6.5" |
| 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 6PEV13 6-1/2" Midrange Speaker?
Load Forge's calculated alignment puts B&C Speakers B&C 6PEV13 6-1/2" Midrange Speaker in a 4.8 liter vented enclosure tuned to 132.7 Hz, reaching an F3 cutoff of approximately 131.0 Hz.
Can B&C Speakers B&C 6PEV13 6-1/2" Midrange Speaker be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 2.1 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 242.6 Hz.
What port dimensions should be used for B&C Speakers B&C 6PEV13 6-1/2" Midrange Speaker to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 3.4 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 6PEV13 6-1/2" Midrange Speaker fits your physical space?
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