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Eminence American Standard Kappa 12A - 12" Replacement Speaker

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Product Description

The Eminence Kappa 12A is a powerful 12-inch driver designed for full-range PA applications. This 8 ohm speaker is 450 watts and has a music program rating of 900 watts.



About Eminence
In 1966, Bob Gault founded what was to become the world's largest loudspeaker manufacturing company after working as an engineer for Magnavox and CTS (Chicago Telephone Supply). Ironically, Gault started Eminence hoping to maintain three 18" speakers per day, based on a commitment from Ampeg's Everett Hull. Under the leadership of Gault and most recently his son, Rob, the company's capacity has grown to over 10,000 speakers per day, employing nearly 200 people.

Gault was the president of Eminence from the company's inception until 1992. He officially retired in 1993, but continued to make valuable contributions to the company. Gault passed away on Octoboer 4, 2002. he was a husband, father, and grandfather. Gault was also an avid golfer. He is greatly missed by his family, the music industry, and the Eminence community.

Eminence, Kentucky (population 3000) is centrally located in the heart of Kentucky, between Louisville and Lexington, Kentucky and Cincinnati, Ohio. Bob Gault chose this location as it was ideally situated for shipping products all over the USA. The Eminence and Henry County community could also provide the labor needed to manufacture products on a large scale. After forty years, Eminence, Kentucky continues to provide ideal conditions for the manufacturing and distribution of the World's #1 Loudspeakers.

The Eminence Factory
The first Eminence facility, located in downtown Eminence, employed around thirty people. The building was less than 6,000 sq. ft. and production was often less in one week than it is in one hour at our present facility. In 1972 Eminence Speaker moved to a new location in Shawnee Industrial Park on Mulberry Pike where we remain today. The facility has seen several additions. The first building in this location was just less than 30,000 sq. ft., but now has grown to include nearly 100,000 sq. ft. all under one roof.



How a Speaker Works
The key working components of a loudspeaker are shown in the diagram below. When an electrical current passes through a wire coil (the voice coil) in a magnetic field, it produces a force which varies with the current applied. The cone, connected to the voice coil, moves in and out, creating waves of high and low air pressure.

The coil and magnet assembly are the 'motor structure' of the loudspeaker. The movement is controlled by the loudspeaker's suspension which comprises the cone surround and the 'spider'. The surround and spider allow the coil to move freely along the axis of the magnet's core (or 'pole') without touching the sides of the magnetic gap.

Eminence technology and proprietary materials mean that age-old 'compromises' of durability against sensitivity, or power handling against precision of response, are more easily solved than you might imagine.



Heatsinks: In the quest for higher power density (more power and hence more sound from less space), Eminence has progressively introduced heatsink components to selected transducers e.g. cast frame neodymium products and Kilomax. The heatsinks pass through the pole of the transducer or are incorporated into the chassis of the loudspeaker to transfer heat away from the coil. The air currents caused by the cone movement cool the heatsink.

Product Specifications
Eminence Kappa 12A Specifications
  • Nominal Basket Diameter: 12 inches, 304.8mm
  • Nominal Impedance*: 8 ohms
  • Power Rating: 450 Watts
  • Music Program: 900W
  • Resonance: 45Hz
  • Usable Frequency Range: 62Hz-4.2kHz
  • Sensitivity***: 99.3
  • Magnet Weight: 80 oz.
  • Gap Height: 0.375", 9.53mm
  • Voice Coil Diameter: 3", 76.2mm


  • Thiele & Small Parameters
  • Resonant Frequency (fs): 45Hz
  • DC Resistance (Re): 5.41
  • Coil Inductance (Le): 0.77mH
  • Mechanical Q (Qms): 7.76
  • Electromagnetic Q (Qes): 0.28
  • Total Q (Qts): 0.27
  • Compliance Equivalent Volume (Vas): 112.1 liters / 4.0 cu. ft.
  • Peak Diaphragm Displacement Volume (Vd): 166cc
  • Mechanical Compliance of Suspension (Cms): 0.30mm/N
  • BL Product (BL): 15.2 T-M
  • Diaphram Mass including Airload (Mms): 42 grams
  • Efficiency Bandwidth Product (EBP): 161
  • Maximum Linear Excursion (Xmax): 3.2mm
  • Surface Area of Cone (Sd): 519.5 cm2
  • Maximum Mechanical Limit (Xlim): 11.5mm


  • Mounting Information
  • Recommended Enclosure (Vented): 34-62 liters/1.2-2.2 cu.ft.
  • Overall Diameter: 12.26 inches, 311.4mm
  • Baffle Hole Diameter: 11.0 inches, 279.5mm
  • Front Sealing Gasket: Fitted as standard
  • Rear Sealing Gasket: Fitted as standard
  • Mounting Holes Diameter: 0.25-inch, 6.4mm
  • Mounting Holes B.C. D.: 11.71 inches, 297.5mm
  • Depth: 5.63 inches, 143mm
  • Net Weight: 14.9 lbs., 6.8 kg
  • Shipping Weight: 17.9 lbs., 8.2 kg


  • Materials of Construction
  • Coil Construction: Aluminum voice coil
  • Coil Former: Polyimide former
  • Magnet Composition: Ferrite magnet
  • Core Details: Vented core
  • Basket Materials: Pressed steel basket
  • Cone Composition: Paper Cone
  • Cone Edge Composition: Cloth cone edge
  • Dustcap Composition: Solid composition paper dust cap
* Please consult www.eminence.com 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, non-temperature controlled environment.
*** The average output across the usable frequency range when applying 1W/1M into the nominal impedance. Ie: 2.83V/8ohms, 4V/16ohms. 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 | 2ft. X 2ft. 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™ CX2008 are coaxial speakers with tweeter sold separately. Published Usable Frequency response contingent upon use of APT 50 HF Driver.

Helpful Info about the Manufacturer
Phone:  502-845-5622 Warranty:  Warranty: 7 years
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