The last Bozak project that Rudy Bozak himself was an integral part of involved a thorough redesign of the B-200Y tweeter which had been a staple of Bozak loudspeakers since its introduction in 1962. The new design echoed earlier changes to the B-209 midrange: the standard tweeter cone shape was modified into a dished open horn shape that flattened out gradually from the center to the periphery. The new design became the B-200Z. Its basic curvilinear configuration was settled in 1974 but production didn't get underway until 1976 and early 1977. The new tweeter extended high frequency response to 16,000 Hz.