A different format, CD-4 (not to be confused with compact disc), by RCA, encoded the front-rear difference information on an ultrasonic carrier, which required a special wideband cartridge to capture it on carefully calibrated pickup arm/turntable combinations. CD-4 was even less successful than the two matrixed formats. (A further problem was that no cutting heads were available that could handle the HF information. That was remedied by cutting at half the speed. Later, the special half-speed cutting heads and equalization techniques were employed to get a wider frequency response in stereo with reduced distortion and greater headroom.) COUNT 5
QSN1 What was a major issue with CD-4 technology? ANS1 no cutting heads were available that could handle the HF information QSN2 How widespread was the success of CD-4 format?  ANS2 even less successful than the two matrixed formats QSN3 What format was less successful than quadraphonic? ANS3 CD-4 QSN4 What were potential benefits of the CD-4 format? ANS4 reduced distortion and greater headroom QSN5 Who created the CD-4 format? ANS5 RCA