Eminence Omega Pro-18A 18" Cast Frame Woofer
Best box: 285.6 L bass reflex tuned to 30.1 Hz · F3 30.8 Hz
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Comparable 18.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Eminence Omega Pro-18A 18" Cast Frame Woofer 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 (285.6 L) requires extensive internal matrix bracing to prevent panel resonance.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 285.6 Liters |
| Tuning Frequency (Fb) | 30.1 Hz |
| F3 (-3 dB Cutoff) | 30.8 Hz |
| F6 / F10 Extension | 27.1 Hz / 23.6 Hz |
| Port Inner Diameter | Ø 12.5 cm |
| Port Physical Length | 5.3 cm |
| First Pipe Resonance | 3259.0 Hz |
| Estimated MOL @ F3 | 121.4 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 130.6 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 53.2 Hz |
| F3 (-3 dB Cutoff) | 55.9 Hz |
| F6 / F10 Extension | 41.7 Hz / 31.3 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 25.0 Hz |
| Total Q (Qts) | 0.31 |
| Electrical Q (Qes) | 0.322 |
| Mechanical Q (Qms) | 8.18 |
| Equivalent Volume (Vas) | 548.8 Liters |
| Diaphragm Area (Sd) | 1159.0 cm² |
| DC Resistance (Re) | 5.2 Ω |
| Efficiency Bandwidth Product (EBP) | 77.6 |
| Linear Excursion (Xmax) | 4.8 mm |
| Thermal Power (Pe) | 800.0 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 Omega Pro-18A 18" Cast Frame Woofer?
Load Forge's calculated alignment puts Eminence Omega Pro-18A 18" Cast Frame Woofer in a 285.6 liter vented enclosure tuned to 30.1 Hz, reaching an F3 cutoff of approximately 30.8 Hz.
Can Eminence Omega Pro-18A 18" Cast Frame Woofer be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 130.6 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 55.9 Hz.
What port dimensions should be used for Eminence Omega Pro-18A 18" Cast Frame Woofer to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 12.5 cm with a length of 5.3 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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