if i would sy that Id get bombardied by *******..
fact of the matter is op amp and DA converters as well as circuity have a unique foot print. the science is there people just refuse to believe it.
i had a pioneer 840 and went to a kenwood x991. it instantly sounded more realistic. then i got a pair of lunar 40x2s on some cheap *** CDT CL62s it was straight up amazing how much more detail i heard. it was like going from 8 bit to 16 bit sound. the CDT tweeters where dull at first once i put the kenwood and lunars it the transient response was so much better it was like going from a cheap *** pair of pioneers to a competition worthy component set.