Pro Audio

Professional Series

Cab Design Spec Sheet


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  $329.99
Your Price  $279.99

For contiguous USA shipments only.

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This table charts the specifications for the IMPERO™ 18A speaker
Speaker Detail
Nominal Basket Diameter18", 457 mm
Nominal Impedance*8 Ω
Power Rating*
Program Power2400 W
Watts1200 W
Resonance33 Hz
Usable Frequency Range39 Hz - 0.8 kHz
Sensitivity*95.9 dB
Magnet Weight109 oz.
Gap Height0.5", 12.7 mm
Voice Coil Diameter4", 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 Displaced0.237 cu.ft. / 6.7 liters
Overall Diameter18", 457.2 mm
Baffle Hole Diameter16.56", 420.6 mm
Front Sealing GasketYes
Rear Sealing GasketYes
Mounting Holes Diameter0.28", 7.1mm
Mounting Holes B.C.D.17.25", 438.2mm
Depth8.31", 211.1 mm
Net Weight27.3 lbs, 12.38 kg
Shipping Weight30.8 lbs, 13.97 kgs
Materials of Construction
Coil ConstructionCopper voice coil
Coil FormerFiberglass former
Magnet CompositionFerrite magnet
Core DetailsBumped Vented Extended core
Basket MaterialsDie-cast aluminum basket
Cone CompositionWater resistant paper cone
Cone Edge CompositionTreated cloth cone edge
Dust Cap CompositionWater resistant treated paper dust cap

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.