As understand it;all the sacd players must be used from the analog outs, on sacd discs.The older pro logic receivers took a signal from the anolog inputs and convereted it to dig. to enable it to do signal processing. That is why you buy a processor in the first place.Yes,years ago Lazer discs were in analog (70's early 80s).The sound quality went up a bunch when the discs were pressed in dig. Then the ld players started coming out with a coax dig out. This allowed the use of a 2 ch outboard dac,before the signal went into your pro logic processor.---Also an improvment. Once DD & DTS came out, aLL digital processors accepted dig. input from the ld or dvd player-----Better yet! No, older analog lds aren't as good as their dig. counterparts.Ok, now what was the question?
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