I didn't have time and I also had a birthday, but you forced me to get service manuals for AVRs and AV processors (8805, 7705, 4400, 4500, 6500, 8012 and others). Service manuals 4700 and 8015 are not available, but findings 4500 and 8012 can be applied to them without any problems. Due to the differences between 4400 and 4500, they will be the same and possibly better due to measurements and tests of 8015. So the 8805 is the best DAC 4490 and they all stay the same 4458. They all have the tragic JRC8080 as the DAC. Only the 8012 has a 30% faster op amp per DAC (not even the 8805). I dare say that if it had 8012 preamp mode, it would be better than 8805. Marantz uses HDAM, it's a few 80MHz transistors. Denon outputs a pair of 30MHz transistors. The preamplifier in Marantz is faster and regardless of the price, the best is the 8012. The Denon 4xxx series is the same, including power amplifiers, and they are quite simple (it doesn't matter now). The 6700 and 8012 have exactly the same amplifiers. From what I saw in the service manuals, I would choose the 8012. I repeat that I do not have the service manual 4700,6700 and 8015, but everything can be applied to newer models. In addition, 8015 does not need (but has) preamp mode. Interestingly, the owners of Marantz write that they have a more detailed and warmer sound, but those who have not heard of Denon do not write anything like that. From this I can deduce that Marantz is simply more faithful, it is also more expensive.
@peng is good that you have studied a few manuals and advise those who can not read that you know a few online calculations, including the slew rate, but if you do not understand why it is always better to have a higher slew rate than calculated, write to
@pma . He built a Hi-Fi preamplifier (maybe Hi-end) with a slew rate of 125V / us and try to explain to him that he is moron, because in your opinion 5V/us(JRC8080) is enough for him. Good luck and the end.