I know you know it, but for those not familiar with the sensitivity spec, I would like to add a cautionary note that the Parasound A23+'s 1 V input sensitivity spec is the input voltage required for 28.28 V output, not for rated output. That means about 100 W into an 8 ohm load (28.28^2)/8 = 99.97 W.
The complete spec is clear about that, but one overlooked the first line by mistake, one might think incorrectly that 1 V unbalanced would drive the amp to its rated output when it won't.
https://parasound.com/a23+.php
"Input Sensitivity for 28.28 V Out (8 Ω Load)
Unbalanced: 1 V
Balanced: 1 V per leg"
"Power Output – Stereo Mode (0.06% THD)
160 watts x 2, 8 Ω both channels driven
240 watts x 2, 4 Ω both channels driven"
Again, 1 V will drive it to about 100 W. It will take about 1.27 V to drive it the rated 160 W output into an 8 ohm load. Other manufacturers, such as Monolith, Anthem for examples, would specified input sensitivity as the voltage required to drive their amp to their rated output.