If you play a matrix style quadraphonic record, (Stereo-4, SQ or QS), through your Dolby Pro-Logic II matrix decoder you will get 5.1 channels of sound. Actually, this works quite well. My experience is that the Dolby Pro-Logic II decoder works better at playing back matrix style quadraphonic records than the many of the purpose-built decoders of the quadraphonic era. Some records decode better than others. That is true whether one is playing back the quadraphonic records using the original matrix decoders or using a Dolby Pro-Logic II decoder. One can also us the Dolby Pro-Logic decoder to play back quadraphonic records. My experience is that the Dolby Pro-Logic II decoder is much superior.



A matrix encoded quadraphonic record will tend to open up more than compared to an ordinary two-channel stereo record because of the encoded information.



Yes, playing a matrix encoded record is a lot less hassle than playing a CD-4 (aka Quadradisc), however, the CD-4 record is much more discrete, has better channel separation, than any of the matrix formats.

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