The down-mix on my AVR retains the stereo surround and the LFE.1 condensed into 2 channels but it’s hard to tell when the stereo surrounds are active and inactive or how soft or loud they are. LFE.1 plays at different level, when it’s played as Dolby discrete it can sound a bit damn loud and needs a leash on it, to hold it back or balance EQ the levels.

SR in the cinema is still the best analogue sound you could hear! Dolby type A is also good sounding, but not used anymore hence the term Dolby SR-D.

Lots of now and then Dolby type A and SR cards turn up on fleabay, but some are wanting you to bid, no thanks. Some, sale them off at practically give away prices.