Yeah that probably relates to higher cost class D amps. But mostly d amps are bargain basement variety and sound pretty bad.
@jumia That is true of some but not all. I have two customers that were quite surprised by the Nobsound class D amps which are less than $300.00! I’ve not heard one myself. As best I can make out some of these less expensive amps are bass response limited to avoid all their power being gobbled up but otherwise sound pretty decent.