Eminence IMPERO 18A: 18 inch High Power Pro Woofer
High power driver recommended for pro audio in vented enclosures. Suited for full-range three-way boxes, bass guitar boxes, and small subwoofers.
Click Here to Download 8 ohm PDF Spec Sheet
Click Here to Download 8 ohm PDF Cabinet Design
| Specification | |
| Nominal Basket Diameter | 18″, 457 mm |
| Nominal Impedance* | 8 Ω |
| Power Rating* | |
| Program Power | 2400 W |
| Watts | 1200 W |
| Resonance | 33 Hz |
| Usable Frequency Range | 39 Hz – 0.8 kHz |
| Sensitivity* | 95.9 dB |
| Magnet Weight | 109 oz. |
| Gap Height | 0.5″, 12.7 mm |
| Voice Coil Diameter | 4″, 102 mm |
| Thiele & Small Parameters | |
| Resonant Frequency (fs) | 33 Hz |
| DC Resistance (Re) | 5.41 Ω |
| Coil Inductance (Le) | 1.47m H |
| Mechanical Q (Qms) | 14.02 |
| Electromagnetic Q (Qes) | 0.44 |
| Total Q (Qts) | 0.43 |
| Compliance Equivalent Volume (Vas) | 317.02 liters / 11.2 cu.ft. |
| Peak Diaphragm Displacement Volume (Vd) | 927.2 cc |
| Mechanical Compliance of Suspension (Cms) | 0.17 mm/N |
| BL Product (BL) | 18.9 T-M |
| Diaphragm Mass Inc. Airload (MMs) | 140 grams |
| Efficiency Bandwidth Product (EBP) | 75 |
| Maximum Linear Excursion (Xmax) | 8 mm |
| Surface Area of Cone (Sd) | 1159 cm2 |
| Maximum Mechanical Limit (Xlim) | 20.2 mm |
| Mounting Information | |
| Recommended Enclosure Volume | |
| Sealed | N/a |
| Vented | 113.27-277.51 liters / 4-9.8 cu.ft. |
| Driver Volume Displaced | 0.237 cu.ft. / 6.7 liters |
| Overall Diameter | 18″, 457.2 mm |
| Baffle Hole Diameter | 16.56″, 420.6 mm |
| Front Sealing Gasket | Yes |
| Rear Sealing Gasket | Yes |
| Mounting Holes Diameter | 0.28″, 7.1mm |
| Mounting Holes B.C.D. | 17.25″, 438.2mm |
| Depth | 8.31″, 211.1 mm |
| Net Weight | 27.3 lbs, 12.38 kg |
| Shipping Weight | 30.8 lbs, 13.97 kgs |
| Materials of Construction | |
| Coil Construction | Copper voice coil |
| Coil Former | Fiberglass former |
| Magnet Composition | Ferrite magnet |
| Core Details | Bumped Vented Extended core |
| Basket Materials | Die-cast aluminum basket |
| Cone Composition | Water resistant paper cone |
| Cone Edge Composition | Treated cloth cone edge |
| Dust Cap Composition | Water resistant treated paper dust cap |
