Dayton Audio ND64-4 2-1/2" Aluminum Magnesium Cone Full-Range Driver 4 Ohm
Best box: 0.12 L sealed · Fc 219.3 Hz · F3 206.0 Hz
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Comparable 2.5" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Dayton Audio ND64-4 2-1/2" Aluminum Magnesium Cone Full-Range Driver 4 Ohm 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: 1.9 mm); set a high-pass subsonic filter at 25–30 Hz when driven with high power.
Textbook Bass Reflex — not recommended (4.8 dB bass hump)
PORT BUILDABLE| Net Box Volume (Vb) | 1.5 Liters |
| Tuning Frequency (Fb) | 117.3 Hz |
| F3 (-3 dB Cutoff) | 109.9 Hz |
| F6 / F10 Extension | 104.6 Hz / 97.6 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 24.9 cm |
| First Pipe Resonance | 690.0 Hz |
| Estimated MOL @ F3 | 96.6 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 0.12 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 219.3 Hz |
| F3 (-3 dB Cutoff) | 206.0 Hz |
| F6 / F10 Extension | 152.7 Hz / 113.2 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 103.0 Hz |
| Total Q (Qts) | 0.33 |
| Electrical Q (Qes) | 0.357 |
| Mechanical Q (Qms) | 4.36 |
| Equivalent Volume (Vas) | 0.4 Liters |
| Diaphragm Area (Sd) | 15.6 cm² |
| DC Resistance (Re) | 3.7 Ω |
| Efficiency Bandwidth Product (EBP) | 288.5 |
| Linear Excursion (Xmax) | 1.9 mm |
| Thermal Power (Pe) | 15.0 W |
| Nominal Diameter | 2.5" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Dayton Audio ND64-4 2-1/2" Aluminum Magnesium Cone Full-Range Driver 4 Ohm?
A simple ported box is not recommended for Dayton Audio ND64-4 2-1/2" Aluminum Magnesium Cone Full-Range Driver 4 Ohm: the textbook alignment (1.5 liters tuned to 117.3 Hz) needs a 24.9 cm port, and no nearby retune stays buildable without a bass hump. A sealed box, a passive radiator or a folded duct is the practical choice.
Can Dayton Audio ND64-4 2-1/2" Aluminum Magnesium Cone Full-Range Driver 4 Ohm be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 0.12 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 206.0 Hz.
What port dimensions should be used for Dayton Audio ND64-4 2-1/2" Aluminum Magnesium Cone Full-Range Driver 4 Ohm to avoid port chuffing?
A straight 5.0 cm port would need 24.9 cm of length, which does not fit a practical cabinet. Use a passive radiator or a folded/3D duct instead of a straight tube.
Shareable Acoustic Card for Forums & Social Media
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