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I've heard that QS (RM) encoded matrix quad discs decode moderately well with DPL-2, but SQ does not. With SQ encoded material, information placed in the center rear position will come out of the surrounds accurately, but material placed in left rear or right rear only will come out of all five speakers in DPL-2.
Decent sounding full-logic SQ decoders were hard to come by in quad's hay-day, let alone now. The all-time best SQ decoder was the Tate 101A, which was co-designed by Jim Fosgate. Lately, the 101A can sell up wards to a grand on eBay. Btw: Jim Fosgate designed the Dolby Pro-Logic II decoding system, bringing us full circle. (Pun intended!)
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