Taken from the Masimo clip posted few days ago. With all respect for the Marantz engineers i suggest taking few glasses of whiskey or vodka before listening this. Kinda hard to listen although
@PENG being EE he probably enjoys listening engineers talking. Especially the HDAM part!
I can tell you the HDAM part is still the same old bullshit, non sense!!
The HDAM's benefits are totally valid technically speaking, but the trouble is the logic. No one has ever, and I am surprised, thought not that surprised
@gene has not challenge their claims so far.
The logic is, as I have explained many times, when a signal chain involves multiple devices, the overall results are limited to the performance of the worse device, or parts.
For example, you can put 10 parts in series, and want to have the best final output resistance, i.e. lowest. If you however, only use one of the parts that have 0.0000 uohms, or even a 0 ohms, better than a straight copper wire, the circuit's final total impedance could still be 0.05 ohms if even just one of the 10 part's impedance is 0.05 ohms.
So how can the HDAM's slew rate matter if the opamps up and down stream of the HDAM itself is the same as those used in other AVRs or AVPs including those made of Marantz and Denon??
That's just one example, just think about the same logic for distortions, frequency response, noise and whatever, just about the only practical benefit might be the rated output voltage and impedance, assuming the HDAM's are the final part in terms of "buffering", but from what I could see in the service manuals, such as those of the SR6014, they do have an opamp placed after the HDAM, and just before the power amp input.
Any questions, challenge on the logic, prove me wrong please..
Having said that, I would love to trade in my AVM70 for the AV20. HDAMs at least would no longer hurt the preout SINAD measurements, as they seemed to have in the past, I guess thanks to ASR's measurements, they have improved since the SR8015.
