Dual compression driver with internal magnets and annular exit

A dual compression driver, comprising:

• a first driver assembly including a first motor assembly having a first internal disc magnet disposed about a central axis at a first end of the dual compression driver, and a first phasing plug disposed coaxially above the first motor assembly, the first phasing plug including an input side oriented toward the first motor assembly and an output side oriented away from the first motor assembly, the first phasing plug including a first plurality of apertures extending therethrough;
• a second driver assembly including a second motor assembly having a second internal disc magnet disposed about the central axis at a second end of the dual compression driver, and a second phasing plug disposed coaxially below the second motor assembly, the second phasing plug including an input side oriented toward the second motor assembly and an output side oriented away from the second motor assembly, the second phasing plug including a second plurality of apertures extending therethrough;
• an extension duct having a bottom end mounted to the first phasing plug and a top end extending toward the second end of the dual compression driver, wherein an inner surface of the extension duct and an outer surface of the second driver assembly form an annular pathway terminating at an annular exit at the second end of the dual compression driver, wherein acoustic signals from the first plurality of apertures merge with acoustic signals from the second plurality of apertures between the output side of the first phasing plug and the output side of the second phasing plug and radiate radially outward to the annular pathway and through the annular exit;
• and
• a shared acoustic path defined between the output side of the first phasing plug and the output side of the second phasing plug for the merged acoustic signals, wherein a minimum length of the shared acoustic path is determined by a position of an outer edge of the second internal disc magnet.

A transducer, comprising:

• a dual compression driver including
• a first driver assembly including a first motor assembly having a first internal disc magnet disposed about a central axis at a first end of the dual compression driver, and a first phasing plug disposed coaxially above the first motor assembly, the first phasing plug including an input side oriented toward the first motor assembly and an output side oriented away from the first motor assembly, the first phasing plug including a first plurality of apertures extending therethrough;
• a second driver assembly including a second motor assembly having a second internal disc magnet disposed about the central axis at a second end of the dual compression driver, and a second phasing plug disposed coaxially below the second motor assembly, the second phasing plug including an input side oriented toward the second motor assembly and an output side oriented away from the second motor assembly, the second phasing plug including a second plurality of apertures extending therethrough;
• and
• an extension duct having a bottom end mounted to the first phasing plug and a top end extending toward the second end of the dual compression driver, wherein an inner surface of the extension duct and an outer surface of the second driver assembly form an annular pathway terminating at an annular exit at the second end of the dual compression driver, wherein acoustic signals from the first plurality of apertures merge with acoustic signals from the second plurality of apertures between the output side of the first phasing plug and the output side of the second phasing plug and radiate radially outward to the annular pathway and through the annular exit;
• and
• a waveguide disposed on the top end of the extension duct, the waveguide having an annular inlet adjacent the annular exit of the dual compression driver.