PRV Audio 6MR500-NDY-4 6-1/2" Neodymium Midrange Woofer 4 Oh
Best box: 6.8 L bass reflex tuned to 89.6 Hz · F3 83.5 Hz
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Comparable 6.5" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the PRV Audio 6MR500-NDY-4 6-1/2" Neodymium Midrange Woofer 4 Oh does not fit your target box volume or tuning. Each entry links to its full enclosure design and Thiele/Small parameters.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 6.8 Liters |
| Tuning Frequency (Fb) | 89.6 Hz |
| F3 (-3 dB Cutoff) | 83.5 Hz |
| F6 / F10 Extension | 75.1 Hz / 66.9 Hz |
| Port Inner Diameter | Ø 6.8 cm |
| Port Physical Length | 15.1 cm |
| First Pipe Resonance | 1141.0 Hz |
| Estimated MOL @ F3 | 113.1 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 3.0 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 159.3 Hz |
| F3 (-3 dB Cutoff) | 160.8 Hz |
| F6 / F10 Extension | 121.7 Hz / 91.9 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 99.8 Hz |
| Total Q (Qts) | 0.43 |
| Electrical Q (Qes) | 0.438 |
| Mechanical Q (Qms) | 23.1 |
| Equivalent Volume (Vas) | 5.1 Liters |
| Diaphragm Area (Sd) | 143.0 cm² |
| DC Resistance (Re) | 3.8 Ω |
| Efficiency Bandwidth Product (EBP) | 227.8 |
| Linear Excursion (Xmax) | 4.4 mm |
| Thermal Power (Pe) | 250.0 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 PRV Audio 6MR500-NDY-4 6-1/2" Neodymium Midrange Woofer 4 Oh?
Load Forge's calculated alignment puts PRV Audio 6MR500-NDY-4 6-1/2" Neodymium Midrange Woofer 4 Oh in a 6.8 liter vented enclosure tuned to 89.6 Hz, reaching an F3 cutoff of approximately 83.5 Hz.
Can PRV Audio 6MR500-NDY-4 6-1/2" Neodymium Midrange Woofer 4 Oh be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 3.0 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 160.8 Hz.
What port dimensions should be used for PRV Audio 6MR500-NDY-4 6-1/2" Neodymium Midrange Woofer 4 Oh to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 6.8 cm with a length of 15.1 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
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