The A23+ and 2125v2 input sensitivity specs are clearly stated. My point was that some people seemed to think the 1 V, 28.28V, 8 ohms mean they only need 1 V pre out voltage from their AVR or AVP, and that is not the case.
1 V, for 28.28V at 8 ohms mean if you connect it to a pre out (preamp output) voltage of 1 V, you will get 28.28 V out of the power amp.
The power formula for a resistor load is P = VI, or P = I² X R, or = V² / R
so for 28.28 V, 8 ohm, Power output = 28.28X28.28/8 = about 100 W.
Using the A23+ as an example, the amp is rated 160 W into 8 ohms, that means an input of 1 V will not drive it to output 160 W, but only 100 W.
To reach the A23+ full rated 160 W output, you will need about 1.3 V. (see the spreadsheet table I attached in my earlier post on page 11)
2022 Denon av-receiver models leaked | Page 11 | Audioholics Home Theater Forums
The X4800H should perform about the same as the X3800H because it has the same preamp vol and dac ICs and the X3700H and X4700H did perform the same based on ASR's previous bench tests.
Those AVR's preamp/dac can output well above 3 V so any of them can drive your Parasound power amps to their rated output without any issues.
About your SINAD question, my suggestion is that people should not focus on just one single point, such as SINAD (or THD+N) at 2 V. That would be like saying your speaker's impedance is 8 ohm, when in fact such values are not one single fixed or constant value. They tend to always vary with another parameter.
So if you can find the curve, that's what you should focus on.
I posted the ASR provided curve before, here it is for you again:
If you have question about the curve, just ask..
View attachment 58462