Broad band dynamic loudspeaker

A loudspeaker comprising:

• a frame,
• a magnetic assembly supported by the frame, the magnetic assembly including a center pole and an outer pole disposed around the center pole to form an annular flux gap therebetween, the center pole having a free forward end,
• a radially flexible coil assembly, the coil assembly including a voice coil wound upon a tubular coil form and disposed for axial reciprocating movement in the annular flux gap,
• an acoustic radiating assembly coupled to the coil assembly for radiating acoustic energy in response to the reciprocating movement of the coil assembly, the acoustic radiating assembly including a centrally located dust cap disposed forward from the free forward end of the center pole, a generally frustoconical shaped speaker cone adjoining the dust cap and flaring radially outward and axially forward from the dust cap and a plurality of sound transmitting ribs rigidly secured to the forward surfaces of the speaker cone and dust cap by adhesive means capable of transmitting acoustic energy at frequencies above about 8,000 Hz, each rib extending radially along the forward surfaces of the dust cap and speaker cone whereby the presence of the ribs imparts mechanical stability to both the acoustic radiating assembly and the coil assembly, each rib being fabricated from thin rigid sheet material and having a dimension normal to the adjoining surfaces of the dust cap and speaker cone that is much greater than its thickness dimension, each rib being capable of axially transmitting acoustic vibrations in the range between 8,000 Hz and 16,000 Hz at a velocity that is substantially equal to the velocity of acoustic energy in air under standard conditions.