Re; Dynamics, Class D vs tubes…

Maybe because I am more accustomed to push-pull tube amps. IME it is quite obvious when a tube amp begins to run out of steam because the dynamics suddenly go flat. 

@helomech Its really hard to generalize how tube amps clip. Some are quite graceful; typically having little or no feedback. But if the amp has a lot of feedback the clipping point will be a lot more obvious. Some in the middle WRT to feedback will seem to just compress a bit (if the power supply is adequate) before the onset of obvious clipping.

Most tube amps with feedback have a higher output impedance than a solid state amp, but if treated properly can behave as a Voltage source on most speakers. Because of the higher output impedance they generally don't like obtuse phase angles (highly reactive loads) and tend to make less power driving them on that account Since obtuse phase angles are usually a bass issue the amp might seem a bit bass shy.... But again we are talking generalizations since not all speakers are the same in that regard!

Not to forget, with a tube pre amp one would need a solid state amp with 100k input impedance to give that dull range .

@daytrader We make tube preamps that can drive 1000 Ohms no worries, with the output impedance being a straight line across the audio band, so no loss of bass impact. IOW not all tube preamps are the same.

 That is because tube amps tend to boost the “bass-slam” frequency range when mated to highly reactive loads.

@helomech This statement is false. Usually its the other way ’round. What tends to cause tube amps to seem to have more power than solid state amps of the same rating is the way they make distortion, particularly, as you alluded, near clipping.

So amp typology for the most part isn’t going to matter much?

@daytrader It better not. The dynamic contrast in any system should arise from the signal and nothing else. Its the system's job to convey this and do so without compression. Lower efficiency speakers do have a phenomena known as 'thermal compression' which is not an amplifier thing. This is one reason higher efficiency speakers are often cited for superior dynamic punch. 

@daytrader , @billstevenson has this right. Whatever dynamic contrast that exists in the system should come from the signal and not the amps. Some amps can 'sound' more dynamic than others but if you measure them you'll see no difference. That is because distortion can cause the ear to be fooled into the perception of dynamics.

A good class D amp can sound right, like an excellent tube amp, at low volume no worries.