System and method for a split-gap audio transducer

An electromotive motor for an audio transducer, the motor comprising:

• a housing comprised of a first spatial region and a second spatial region, the second spatial region being directionally opposite in spatial orientation from the first spatial region, each spatial region having a vertical side and a horizontal side;
• a first magnet placed in the first spatial region, the first magnet having a first side and a second side, the first magnet having a magnetic orientation in which a south-seeking pole on the first side is placed on the horizontal side in the first spatial region;
• a second magnet placed in the second spatial region, the second magnet having a first side and a second side, the second magnet having a magnetic orientation in which a south-seeking pole on the first side is placed on the horizontal side in the second spatial region;
• a pole piece placed on the first magnet, the pole piece having a vertical side, the pole piece placed on the second side of the first magnet in the first spatial region, the second side of the first magnet having a north-seeking pole of the magnetic orientation, the vertical side of the pole piece having at least one notch;
• a first voice coil wound upon a first voice coil former and suspended in a first air gap in the first spatial region, the first voice coil configured for translational movement within the first air gap in response to an electrical signal flowing in the first voice coil, the electrical signal generated from an audio amplifier;
• and
• a second voice coil wound upon a second voice coil former and suspended in a second air gap in the second spatial region, the second voice coil configured for translational movement within the second air gap in response to the electrical signal flowing in the second voice coil;
• wherein the first voice coil is coupled to a first diaphragm and the second voice coil is coupled to a second diaphragm, each voice coil being operative to vibrationally drive each coupled diaphragm with antiphase motion as the electrical signal flows in the voice coil while a magnetic field flows across the first voice coil in the first air gap and the second voice coil in the second air gap.

An electromotive motor for an audio transducer, the motor comprising:

• a housing comprised of a magnetically permeable material and having a vertical portion and a horizontal portion, the horizontal portion having a first surface and a second surface, the vertical portion and the horizontal portion defining a first spatial region and a second spatial region;
• a first permanent magnet placed in the first spatial portion and having a first side and a second side, the first permanent magnet having a magnetic orientation with a south-seeking pole on the first side, the first side placed upon the first surface of the horizontal portion of the housing;
• a second permanent magnet placed in the second spatial portion and having a first side and a second side, the second permanent magnet having a magnetic orientation with a north-seeking pole on the first side and a south-seeking pole on the second side, the first side placed upon the second surface of the horizontal portion of the housing;
• a first composite structure comprised of an inner pole piece, a first split-gap magnet, and an outer pole piece, the first split-gap magnet having a north-seeking pole on a first side and a south-seeking pole on a second side, the outer pole piece placed on the first side of the first split-gap magnet, the inner pole piece having a first surface and a second surface, the first surface of the inner pole piece placed on the second side of the first split-gap magnet, the second surface of the inner pole piece placed on the second side of the first permanent magnet;
• a second composite structure comprised of an inner pole piece, a second split-gap magnet, and an outer pole piece, the second split-gap magnet having a north-seeking pole on a first side and a south-seeking pole on a second side, the outer pole piece placed on the second side of the second split-gap magnet, the inner pole piece having a first surface and a second surface, the first surface of the inner pole piece placed on the first side of the second split-gap magnet, the second surface of the inner pole piece placed on the second side of the second permanent magnet;
• a first voice coil wound upon a first voice coil former, the first voice coil suspended in a first air gap defined between the first composite structure and the vertical portion of the housing, the first voice coil configured for translational movement within the first air gap in response to an electrical signal flowing in the first voice coil, the electrical signal generated from an audio amplifier;
• and
• a second voice coil wound upon a second voice coil former, the second voice coil suspended in a second air gap defined between the second composite structure and the vertical portion of the housing, the second voice coil configured for translational movement within the second air gap in response to the generated electrical signal flowing in the second voice coil;
• wherein the first voice coil is coupled to a first diaphragm and the second voice coil is coupled to a second diaphragm, the first voice coil being operative to vibrationally drive the first diaphragm for emission of an audio signal in a first direction in response to the electrical signal as a magnetic field flows across the first voice coil in the first air gap, the second voice coil being operative to vibrationally drive the second diaphragm for emission of the audio signal in a second direction in response to the electrical signal as the magnetic field flows across the second voice coil in the second air gap.