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Eminence Speaker EJ-1240-16

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Quick Overview

Eric Johnson, George Alessandro and Eminence have teamed up once again to reinvent vintage tone...


Eric Johnson, George Alessandro and Eminence have teamed up once again to reinvent vintage tone. Through a reformulated paper cone and optimized basket design, the 40 watt EJ-1240 offers vintage Alnico tone with tight, punchy lows, nice lower-mid growl, crisp upper-mids, and very controlled, articulate, and open highs.


Nominal Basket Diameter12", 305 mm
Nominal Impedance*16 Ω
Power Rating**
Watts40 W
Music ProgramN/A
Resonance73 Hz
Usable Frequency Range80 Hz - 5 kHz
Sensitivity***100.6 dB
Magnet Weight35 oz.
Gap Height0.313", 8 mm
Voice Coil Diameter1.75", 44 mm
Resonant Frequency (fs)73 Hz
DC Resistance (Re)14.28 Ω
Coil Inductance (Le)0.95m H
Mechanical Q (Qms)18.12
Electromagnetic Q (Qes)0.64
Total Q (Qts)0.62
Compliance Equivalent Volume (Vas)74.96 liters / 2.65 cu.ft.
Peak Diaphragm Displacement Volume (Vd)64.4 cc
Mechanical Compliance of Suspension (Cms)0.2 mm/N
BL Product (BL)15.58 T-M
Diaphragm Mass Inc. Airload (MMs)24 grams
Efficiency Bandwidth Product (EBP)115
Maximum Linear Excursion (Xmax)1.24 mm
Surface Area of Cone (Sd)519.5 cm2
Maximum Mechanical Limit (Xlim)N/A
Recommended Enclosure Volume
Driver Volume Displaced0.079 cu.ft. / 2.24 liters
Overall Diameter12.17", 309.1 mm
Baffle Hole Diameter11.13", 282.7 mm
Front Sealing GasketYes
Rear Sealing GasketN/A
Mounting Holes Diameter0.24", 6.1mm
Mounting Holes B.C.D.11.75", 298.5mm
Depth6.25", 158.8 mm
Net Weight8.4 lbs, 3.81 kg
Shipping Weight10.2 lbs, 4.63 kgs
Coil ConstructionCopper voice coil
Coil FormerPaper former
Magnet CompositionAlnico magnet
Core DetailsNon-vented core
Basket MaterialsPressed steel basket
Cone CompositionPaper cone
Cone Edge CompositionPaper cone edge
Dust Cap CompositionZurette dust cap


* Please consult for specifications of models with alternative impedances.

** Multiple units exceed published rating evaluated under EIA 426A noise source and test standard while in a free-air, nontemperature-controlled environment.

*** The average output across the usable frequency range when applying 1W/1m into the nominal impedance. ie: 2.83 V /8 ohms, 4 V /16 ohms. 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 | Hafler P1500 Trans-Nova amplifier | 2700 cu. ft. chamber with fiberglass on all six surfaces (three with custom-made wedges).

**** BETA 8CX, 10CX, 12CX and ACOUSTINATOR™ CX 2008 are coaxial speakers with tweeter sold separately. Published Usable Frequency response contingent upon use of APT 50 HF Driver.

***** Multiple units exceeded published rating evaluated under AES 500 and AES 800 noise sources and test standards while mounted on Eminence's TI-2000 horn in a nontemperature-controlled environment.

****** The average on axis output across the entire usable frequency range when applying 1W/1m into the nominal impedance while mounted on a Community SH 494 horn measured with: LMS (software calibrated) using a 0.25" [6.4mm] supplied microphone mounted 1m from horn mouth, Hafler P1500 Trans-Nova amplifier, 2700 cu.ft. chamber w/fiberglass on all six surfaces (three with custom made wedges). Plane-wave tube response and impedance curves measured with LMS on a 0.75" [19.1mm] diameter tube with adapter to allow for smooth transition to throat diameter and 1W/1m into nominal impedance. Prices and Specifications Subject to Change Without Notice.