PRV Audio 8FR250 8" Full-Range Speaker
Best box: 17.0 L bass reflex tuned to 64.3 Hz · F3 96.2 Hz
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Comparable 8.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the PRV Audio 8FR250 8" Full-Range 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: 2.0 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) | 17.0 Liters |
| Tuning Frequency (Fb) | 64.3 Hz |
| F3 (-3 dB Cutoff) | 96.2 Hz |
| F6 / F10 Extension | 83.2 Hz / 67.0 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 4.8 cm |
| First Pipe Resonance | 3584.0 Hz |
| Estimated MOL @ F3 | 108.9 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 1.02 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 1.442; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 21.2 Liters |
| System Q (Qtc) | 1.442 (above Butterworth: Qtc cannot fall below Qts (1.02)) |
| System Resonance (Fc) | 106.9 Hz |
| F3 (-3 dB Cutoff) | 85.4 Hz |
| F6 / F10 Extension | 73.5 Hz / 61.0 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 75.6 Hz |
| Total Q (Qts) | 1.02 |
| Electrical Q (Qes) | 1.1 |
| Mechanical Q (Qms) | 14.07 |
| Equivalent Volume (Vas) | 21.2 Liters |
| Diaphragm Area (Sd) | 227.0 cm² |
| DC Resistance (Re) | 6.6 Ω |
| Efficiency Bandwidth Product (EBP) | 68.7 |
| Linear Excursion (Xmax) | 2.0 mm |
| Thermal Power (Pe) | 125.0 W |
| Nominal Diameter | 8.0" |
| 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 8FR250 8" Full-Range Speaker?
Load Forge's calculated alignment puts PRV Audio 8FR250 8" Full-Range Speaker in a 17.0 liter vented enclosure tuned to 64.3 Hz, reaching an F3 cutoff of approximately 96.2 Hz.
Can PRV Audio 8FR250 8" Full-Range Speaker be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 21.2 liters with a Qtc of 1.442 (above Butterworth: Qtc cannot fall below Qts (1.02)), the system exhibits an F3 of 85.4 Hz.
What port dimensions should be used for PRV Audio 8FR250 8" Full-Range Speaker to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 4.8 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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