Patent ID: RE41384

Claim:
A sound reproduction unit comprising a central, head receiving portion, opposite first and second ends, the first end having opposed front and back surfaces, the second end having opposed front and back surfaces, means for mounting within the first end a first acoustic transducer loudspeaker having opposed first front and second rear radiating surfaces , means for mounting within the second end a second acoustic transducer loudspeaker having opposed third front and fourth rear radiating surfaces , a first port connecting the first acoustic transducer loudspeaker and the front surface of the first end to provide a first acoustically substantially transparent pathway between the first front radiating surface and the front surface of the first end , a second port connecting the first acoustic transducer loudspeaker and the back surface of the first end to provide a second acoustically substantially transparent pathway between the second rear radiating surface and the back surface of the first end , a third port connecting the second acoustic transducer loudspeaker and the front surface of the second end to provide a third acoustically substantially transparent pathway between the third front radiating surface and the front surface of the second end , and a fourth port connecting the second acoustic transducer loudspeaker and the back surface of the second end to provide a fourth acoustically substantially transparent pathway between the fourth rear radiating surface and the rear surface of the second end .