Eighteen Sound 8NM610
Best box: 0.19 L sealed · Fc 762.8 Hz · F3 672.4 Hz
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Comparable 8.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Eighteen Sound 8NM610 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: 3.0 mm); set a high-pass subsonic filter at 25–30 Hz when driven with high power.
Textbook Bass Reflex — not recommended (10.3 dB bass hump)
PORT BUILDABLE| Net Box Volume (Vb) | 1.5 Liters |
| Tuning Frequency (Fb) | 409.9 Hz |
| F3 (-3 dB Cutoff) | 384.4 Hz |
| F6 / F10 Extension | 360.9 Hz / 331.5 Hz |
| Port Inner Diameter | Ø 12.5 cm |
| Port Physical Length | 5.7 cm |
| First Pipe Resonance | 3040.0 Hz |
| Estimated MOL @ F3 | 127.3 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 0.19 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 762.8 Hz |
| F3 (-3 dB Cutoff) | 672.4 Hz |
| F6 / F10 Extension | 522.4 Hz / 397.4 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 260.0 Hz |
| Total Q (Qts) | 0.23 |
| Electrical Q (Qes) | 0.285 |
| Mechanical Q (Qms) | 1.2 |
| Equivalent Volume (Vas) | 1.6 Liters |
| Diaphragm Area (Sd) | 220.0 cm² |
| DC Resistance (Re) | 10.0 Ω |
| Efficiency Bandwidth Product (EBP) | 913.8 |
| Linear Excursion (Xmax) | 3.0 mm |
| Thermal Power (Pe) | 400.0 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 Eighteen Sound 8NM610?
A simple ported box is not recommended for Eighteen Sound 8NM610: the textbook alignment (1.5 liters tuned to 409.9 Hz) needs a 5.7 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 Eighteen Sound 8NM610 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 0.19 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 672.4 Hz.
What port dimensions should be used for Eighteen Sound 8NM610 to avoid port chuffing?
A straight 12.5 cm port would need 5.7 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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