PRV Audio 8MR400-NDY-4
Best box: 8.6 L bass reflex tuned to 59.3 Hz · F3 128.2 Hz
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Comparable 8.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the PRV Audio 8MR400-NDY-4 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 (5.7 L at 98.9 Hz) would need a 18.4 cm port; the recommendation is retuned to 8.6 L at 59.3 Hz so the port can be built.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 8.6 Liters |
| Tuning Frequency (Fb) | 59.3 Hz |
| F3 (-3 dB Cutoff) | 128.2 Hz |
| F6 / F10 Extension | 110.0 Hz / 88.8 Hz |
| Port Inner Diameter | Ø 6.8 cm |
| Port Physical Length | 31.1 cm |
| First Pipe Resonance | 552.0 Hz |
| Estimated MOL @ F3 | 115.2 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 1.19 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 1.683; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 7.1 Liters |
| System Q (Qtc) | 1.683 (above Butterworth: Qtc cannot fall below Qts (1.19)) |
| System Resonance (Fc) | 164.6 Hz |
| F3 (-3 dB Cutoff) | 133.8 Hz |
| F6 / F10 Extension | 116.9 Hz / 98.3 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 116.4 Hz |
| Total Q (Qts) | 1.19 |
| Electrical Q (Qes) | 1.37 |
| Mechanical Q (Qms) | 9.05 |
| Equivalent Volume (Vas) | 7.1 Liters |
| Diaphragm Area (Sd) | 241.0 cm² |
| DC Resistance (Re) | 3.7 Ω |
| Efficiency Bandwidth Product (EBP) | 85.0 |
| Linear Excursion (Xmax) | 4.8 mm |
| Thermal Power (Pe) | 200.0 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 8MR400-NDY-4?
Load Forge's calculated alignment puts PRV Audio 8MR400-NDY-4 in a 8.6 liter vented enclosure tuned to 59.3 Hz, reaching an F3 cutoff of approximately 128.2 Hz.
Can PRV Audio 8MR400-NDY-4 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 7.1 liters with a Qtc of 1.683 (above Butterworth: Qtc cannot fall below Qts (1.19)), the system exhibits an F3 of 133.8 Hz.
What port dimensions should be used for PRV Audio 8MR400-NDY-4 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 6.8 cm with a length of 31.1 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
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