Aiyima 4ohm 5w 40mm black
Best box: 0.073 L sealed · Fc 235.2 Hz · F3 240.7 Hz
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Comparable 1.5" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Aiyima 4ohm 5w 40mm black 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
- Xmax is not published, so the port size is an empirical estimate (area ≥ 12 in² per ft³ of net volume, minimum by driver size), not a displacement calculation. Check air velocity in Load Forge Studio.
Textbook Bass Reflex — not recommended (5.7 dB bass hump)
PORT BUILDABLE| Net Box Volume (Vb) | 1.5 Liters |
| Tuning Frequency (Fb) | 130.0 Hz |
| F3 (-3 dB Cutoff) | 122.2 Hz |
| F6 / F10 Extension | 117.0 Hz / 110.2 Hz |
| Port Inner Diameter ESTIMATED | Ø 5.0 cm |
| Port Physical Length | 19.6 cm |
| First Pipe Resonance | 876.0 Hz |
| Estimated MOL @ F3 | 91.4 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 0.073 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 235.2 Hz |
| F3 (-3 dB Cutoff) | 240.7 Hz |
| F6 / F10 Extension | 179.6 Hz / 134.5 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 153.6 Hz |
| Total Q (Qts) | 0.459 |
| Electrical Q (Qes) | 0.497 |
| Mechanical Q (Qms) | 6.01 |
| Equivalent Volume (Vas) | 0.1 Liters |
| Diaphragm Area (Sd) | 7.4 cm² |
| DC Resistance (Re) | 3.56 Ω |
| Efficiency Bandwidth Product (EBP) | 309.1 |
| Linear Excursion (Xmax) | N/A mm |
| Thermal Power (Pe) | 5.0 W |
| Nominal Diameter | 1.5" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Aiyima 4ohm 5w 40mm black?
A simple ported box is not recommended for Aiyima 4ohm 5w 40mm black: the textbook alignment (1.5 liters tuned to 130.0 Hz) needs a 19.6 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 Aiyima 4ohm 5w 40mm black be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 0.073 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 240.7 Hz.
What port dimensions should be used for Aiyima 4ohm 5w 40mm black to avoid port chuffing?
A straight 5.0 cm port would need 19.6 cm of length, which does not fit a practical cabinet. Use a passive radiator or a folded/3D duct instead of a straight tube.
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