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Morel Voice Coil for CAT378Replacement voice coil for CAT378 tweeter.The R-37 voice coil will only repair your tweeter if it is in the three parts, horn, voice coil assembly and magnet. It cannot be used to repair an older version MDT27, MDT37 or older CAT378 tweeter that has the dome and terminals mounted to the horn.Please note this replacement voice coil does not include the horn.