PRV Audio RS65-PRO
Best box: 9.2 L bass reflex tuned to 78.3 Hz · F3 131.3 Hz
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Comparable 6.5" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the PRV Audio RS65-PRO 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 (4.6 L at 111.9 Hz) would need a 14.0 cm port; the recommendation is retuned to 9.2 L at 78.3 Hz so the port can be built.
- Limited linear excursion (Xmax: 3.35 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) | 9.2 Liters |
| Tuning Frequency (Fb) | 78.3 Hz |
| F3 (-3 dB Cutoff) | 131.3 Hz |
| F6 / F10 Extension | 108.9 Hz / 65.4 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 6.9 cm |
| First Pipe Resonance | 2507.0 Hz |
| Estimated MOL @ F3 | 114.1 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 1.06 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 1.499; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 5.8 Liters |
| System Q (Qtc) | 1.499 (above Butterworth: Qtc cannot fall below Qts (1.06)) |
| System Resonance (Fc) | 186.1 Hz |
| F3 (-3 dB Cutoff) | 148.6 Hz |
| F6 / F10 Extension | 128.4 Hz / 106.9 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 131.6 Hz |
| Total Q (Qts) | 1.06 |
| Electrical Q (Qes) | 1.184 |
| Mechanical Q (Qms) | 10.15 |
| Equivalent Volume (Vas) | 5.8 Liters |
| Diaphragm Area (Sd) | 154.0 cm² |
| DC Resistance (Re) | 3.4 Ω |
| Efficiency Bandwidth Product (EBP) | 111.2 |
| Linear Excursion (Xmax) | 3.4 mm |
| Thermal Power (Pe) | N/A 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 RS65-PRO?
Load Forge's calculated alignment puts PRV Audio RS65-PRO in a 9.2 liter vented enclosure tuned to 78.3 Hz, reaching an F3 cutoff of approximately 131.3 Hz.
Can PRV Audio RS65-PRO be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 5.8 liters with a Qtc of 1.499 (above Butterworth: Qtc cannot fall below Qts (1.06)), the system exhibits an F3 of 148.6 Hz.
What port dimensions should be used for PRV Audio RS65-PRO to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 6.9 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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