Which Sansui did you have? The -001 series had their best decoders. I love my QRX-7001. Both the SQ and QS sound really really good. The synthesize surround mode does a fantastic job on many stereo recording, too. The earlier Sansui's, like most early decoders, didn't do much for front/rear separation.How does an SQ LP decode well ? My Monster Sansui receiver never decoded anything. There is "Decode" settings but did nothing, it still played in stereo. That should have had a Built-In Decoder. Sorry to revive an old thread.