Re; Dynamics, Class D vs tubes…


Class D amplification vs tube amplification, which is likely to be more dynamic at lower volume playback?   Assuming speakers that are more difficult to drive than average.  Let’s say, 4 ohms dipping to 3.2 ohms and running about 85 db efficient. 

daytrader

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. 

@dekay I learned that word from a master of pleasure:

“Beauty belongs to the sphere of the simple, the ordinary, whilst ugliness is something extraordinary, and there is no question but that every ardent imagination prefers in lubricity, the extraordinary to the commonplace”
― Marquis de Sade

I had to look lubricity up  

oily smoothness

As opposed to the extra meaning in lubricious

offensively displaying or intended to arouse sexual desire. "he probed the ladies for every lubricious detail of their interactions"

Really depends on the design, but generally speaking, I’d say tube amps. 

That is because tube amps tend to boost the “bass-slam” frequency range when mated to highly reactive loads. It’s the same reason for why listeners often say tube watts sound more powerful than SS watts. Tube amps also clip softly, but that’s not the reason they often sound more powerful than a SS counterpart. 

Another reason is that IME, most Class D amplifiers sound flat and lifeless in terms of bass dynamics (well most of their bandwidth actually). The notable exception I’ve encountered is the Axxess Forté 1 integrated—the only Class D amp I have ever felt was worth owning. Its distortion is second harmonic dominant, similar to a good SET amp in that regard.