PRV Audio 3MR40-NDY-4 3" Neodymium Midrange Speaker 4 Ohms
Best box: 1.5 L bass reflex tuned to 130.2 Hz · F3 122.2 Hz
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Comparable 3.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the PRV Audio 3MR40-NDY-4 3" Neodymium Midrange Speaker 4 Ohms 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: 1.4 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) | 1.5 Liters |
| Tuning Frequency (Fb) | 130.2 Hz |
| F3 (-3 dB Cutoff) | 122.2 Hz |
| F6 / F10 Extension | 108.2 Hz / 96.8 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 19.6 cm |
| First Pipe Resonance | 879.0 Hz |
| Estimated MOL @ F3 | 102.1 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.77 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 1.089; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 0.62 Liters |
| System Q (Qtc) | 1.089 (above Butterworth: Qtc cannot fall below Qts (0.77)) |
| System Resonance (Fc) | 216.7 Hz |
| F3 (-3 dB Cutoff) | 178.8 Hz |
| F6 / F10 Extension | 148.7 Hz / 119.9 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 153.2 Hz |
| Total Q (Qts) | 0.77 |
| Electrical Q (Qes) | 0.995 |
| Mechanical Q (Qms) | 3.41 |
| Equivalent Volume (Vas) | 0.6 Liters |
| Diaphragm Area (Sd) | 33.2 cm² |
| DC Resistance (Re) | 3.4 Ω |
| Efficiency Bandwidth Product (EBP) | 154.0 |
| Linear Excursion (Xmax) | 1.4 mm |
| Thermal Power (Pe) | 40.0 W |
| Nominal Diameter | 3.0" |
| 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 3MR40-NDY-4 3" Neodymium Midrange Speaker 4 Ohms?
Load Forge's calculated alignment puts PRV Audio 3MR40-NDY-4 3" Neodymium Midrange Speaker 4 Ohms in a 1.5 liter vented enclosure tuned to 130.2 Hz, reaching an F3 cutoff of approximately 122.2 Hz.
Can PRV Audio 3MR40-NDY-4 3" Neodymium Midrange Speaker 4 Ohms be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 0.62 liters with a Qtc of 1.089 (above Butterworth: Qtc cannot fall below Qts (0.77)), the system exhibits an F3 of 178.8 Hz.
What port dimensions should be used for PRV Audio 3MR40-NDY-4 3" Neodymium Midrange Speaker 4 Ohms to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 19.6 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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