heh, engineers have different opinions and do not necessarily match what the "audiophile" thinks. I am not knocking the Kinki engineer. Engineers actually do a very good job in a lot of places because one of the things they have to combat is the overall cost of manufacturing. This is a place where op amps become a much cheaper alternative to fully discrete circuits. If you are designing with a $2200 end-point cost to the consumer, you have so many other challenges. Of course, the Kinki is not going to be fully discrete, but then if you wanted fully discrete integrated you are looking at $4-6k at a minimum.
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I have tested so many different op amps. Some are nice, some are not. All my testing is with very high end power supplies and I pay specific attention to compensation capacitors to reduce/remove oscillation that occurs on op amps with higher slew rates. However, all the monolothic op amps were compromised in some fashion or another. Not one of them matched the sound quality of the discrete op amps. Even the Sparkos which tend to push too hard the attack of the signal and become harsh will have a better overall sound quality than any other monolithic op amp.
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To give another view on the 5 op amps. I think the one "odd" op amp that is closest to the RCA inputs is there to convert the single-ended RCA to a fully balanced signal. The remaining 4 op amps in the middle of the board are your normal "preamp stage" and/or the amp board pre-driver circuits. So, if you are only running a balanced source, you probably don't need to replace that single "odd" op amp.
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I have tested so many different op amps. Some are nice, some are not. All my testing is with very high end power supplies and I pay specific attention to compensation capacitors to reduce/remove oscillation that occurs on op amps with higher slew rates. However, all the monolothic op amps were compromised in some fashion or another. Not one of them matched the sound quality of the discrete op amps. Even the Sparkos which tend to push too hard the attack of the signal and become harsh will have a better overall sound quality than any other monolithic op amp.
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To give another view on the 5 op amps. I think the one "odd" op amp that is closest to the RCA inputs is there to convert the single-ended RCA to a fully balanced signal. The remaining 4 op amps in the middle of the board are your normal "preamp stage" and/or the amp board pre-driver circuits. So, if you are only running a balanced source, you probably don't need to replace that single "odd" op amp.

