Eminence NSW4018-8 18" Professional Neodymium Tour Grade Subwoofer Driver
Best box: 153.6 L bass reflex tuned to 36.1 Hz · F3 35.4 Hz
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Comparable 18.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Eminence NSW4018-8 18" Professional Neodymium Tour Grade Subwoofer Driver 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
- Large enclosure volume (153.6 L) requires extensive internal matrix bracing to prevent panel resonance.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 153.6 Liters |
| Tuning Frequency (Fb) | 36.1 Hz |
| F3 (-3 dB Cutoff) | 35.4 Hz |
| F6 / F10 Extension | 32.0 Hz / 28.7 Hz |
| Port Inner Diameter | Ø 20.0 cm |
| Port Physical Length | 32.7 cm |
| First Pipe Resonance | 525.0 Hz |
| Estimated MOL @ F3 | 124.2 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 66.8 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 64.1 Hz |
| F3 (-3 dB Cutoff) | 91.8 Hz |
| F6 / F10 Extension | 61.9 Hz / 42.3 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 36.0 Hz |
| Total Q (Qts) | 0.38 |
| Electrical Q (Qes) | 0.398 |
| Mechanical Q (Qms) | 8.46 |
| Equivalent Volume (Vas) | 164.5 Liters |
| Diaphragm Area (Sd) | 1217.0 cm² |
| DC Resistance (Re) | 3.86 Ω |
| Efficiency Bandwidth Product (EBP) | 90.5 |
| Linear Excursion (Xmax) | 15.2 mm |
| Thermal Power (Pe) | 1600.0 W |
| Nominal Diameter | 18.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Eminence NSW4018-8 18" Professional Neodymium Tour Grade Subwoofer Driver?
Load Forge's calculated alignment puts Eminence NSW4018-8 18" Professional Neodymium Tour Grade Subwoofer Driver in a 153.6 liter vented enclosure tuned to 36.1 Hz, reaching an F3 cutoff of approximately 35.4 Hz.
Can Eminence NSW4018-8 18" Professional Neodymium Tour Grade Subwoofer Driver be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 66.8 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 91.8 Hz.
What port dimensions should be used for Eminence NSW4018-8 18" Professional Neodymium Tour Grade Subwoofer Driver to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 20.0 cm with a length of 32.7 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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