oth, with no other information, i would read the plot the same way and come to the same conclusion. but claus and sputniks have relevant experience, and i don't, so i'm betting there is more to the story than that simple plot presents.

thinking about it, i'd expect someone could have developed that concept and come up with a way to make the same amplifier push only to thereby double the power of the amp with the same current drain, transistors, cost, etc.

it seems like an idea that could work... maybe?

 

I hate to beat this to death, and Claus and NS are very knowledgeable.
However, if class D amps really were push only, the web would be loaded
with descriptions of them as such, and yet I can't find any references to
that, but plenty of them producing a standard AC output. Their input
signal is AC, and that's what an amp is supposed to do - produce the
same output only magnified. In addition, it just doesn't pass the smell
test - you're reducing the speaker's ability to produce sound by 50%.
To quote "The Comprehensive Dictionary of Electrical Engineering"
by Phillip A. Laplante (p. 107): "Usually class D power amplifiers are
designed in a push-pull configuration to take advantage of both halves of
a cycle." I can't believe anyone would produce an audio amplifier that
would do differently. If anyone can provide a reference to a different
design, I'm certainly interested.

 

there are push-pull class Ds out there, but i think most main stream aren't.

http://www.extron.com/company/article.aspx?id=ts122001

 

lol, the one above is a pull only...

also, another thing to remember is that an AC signal can ride on top of a DC offset. Please remember, AC's reference point(0V) is subjective.

why i think most of them are push only? well, cuz most of the bass heads are only interested in the thump, not quality, thus more of a win-win for those manufacturers in most of the situation...

from the wiki page ACE123 posted, this is the better picture

 

Did you even look at the page you posted?
It clearly shows a circuit with two complementary output signals, producing
negative and positive output signals (AC) going into the filter and on to the
speaker.

And as for the image ace posted, it was from a discussion of PWM, not class D amps.
A single PWM signal will be DC, but I see no evidence anyone has ever designed
an actual audio amp that does this.
Your argument that you think the amps are push-only because bass heads only want
thump makes no sense, as the design would reduce thump.