Pro Audio
Professional Series
IMPERO™ 18A
High power driver recommended for pro audio in vented enclosures. Suited for full-range three-way boxes, bass guitar boxes, and small subwoofers.
Suggested Retail $319.99
Your Price $269.99
For contiguous USA shipments only.
- Free Tech Support
- 7-Year Warranty*
| 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 |
Footnotes
Multiple units exceed published ratings evaluated under EIA 426A specification while tested in a free-air, non-temperature-controlled environment. Multiple compression drivers exceeded published ratings evaluated under EIA-426A or AES specification while mounted on Eminence’s H290, H290S, or H2EA horn in a non-temperature-controlled environment.
The average output across the usable frequency range when applying 1W/1m into the nominal impedance. i.e: 2.83V/8Ω, 4V/16Ω. Eminence response curves are measured under the following conditions: All speakers are tested at 1W/1m using a variety of test set-ups for the appropriate impedance | LMS using 0.25" supplied microphone (software calibrated) mounted 1m from wall/baffle | 2 ft. x 2 ft. baffle is built into the wall with the speaker mounted flush against a steel ring for minimum diffraction | Yamaha P3500S amplifier | 2700 cu. ft. chamber with fiberglass on all six surfaces (three with custom-made wedges). Compression drivers were tested using a 2ft x 2ft baffle built into the wall with horn front mounted.
BETA 8CX, 10CX and 12CX are coaxial speakers with tweeter sold separately. The data for these coaxial woofers was calculated with the ASD:1001 driver screwed into the woofer, but not active.
Prices, specifications and product cosmetics are subject to change without notice.
