4 Channel RM Sound

Series of records released in Japan during the 1970s on various labels. They all have the same logo 4 Channel RM Sound usually on a sash on the left side and / or the top right hand corner. RM stands for Regular Matrix which is basically the same as the Sansui QS quadraphonic format. Records encoded in the RM or QS format can be decoded best via a Sansui QS four channel decoder or a stereo with the QS or RM (Regular Matrix) setting.