Class A vs. AB vs. D... can you hear a difference?

I've owned excellent versions of all 3... I've owned a dozen or so amplifiers in my time and can tell a difference between every amp that I've owned, But I can't say that it because one was Class A... A/B or D... Great amps are available in every class output. I suspect that if you put 3 excellent examples of a Class A, Class A/B and a Class D in any system, most of us would be pretty happy campers.
I currently own a very highly modified Sumo Nine and an amp with Abletec Mono Modules that I built in a stereo case.
Both are very nice... By the way, anyone out there that would like to venture into Class A inexpensively, the Sumo dead stock is pretty good, but proper parts upgrade really make this amp come to like, incredible value.
Overall, I believe that you could make an easy enough argument for tube type or bipolar vs Mosfet or any other output device. Overall, its the design that matters.
I hope this helps, Tim

Bill, I'm very sorry that I wasn't objective and lost site of this question.
"Some Class A amps go to class AB after so many watts... is there an audible change?"

A short answer would be, don't worry, a good representation of Class A, A/B or D could do a good job in your home theater.
It is more how the design is implemented than the class of Amplifier. Check the forums and read a few reviews, you'll zone in on a few pieces very quickly. I'm sure that if you would like to advise if your are thinking a receiver or integrated or seperates, you will get some good advice.
Good Listening, Tim

M-db and Bill, I also apologize, I realized those remarks might or might not at all have been directed at me... I sometimes find this forum quite difficult, we are a bunch of arrogant audio heads, we all know it all. On occasion some new members or less active members find their courage to get involved and post, then out of nowhere they get shot down and that ends their involvement. I'm sure that I am guilty. I've been at this 35 years and have said DUMB things on this forum... I hope he doesn't mind, but the mighty Ralph Karsten once sent me a private email about a post, he was caring that I didn't look stupid... what a gentleman!.. I explained my position to him, he said I was correct and then I re explained correctly on the forum. This is what we need in this this forum.... Sorry for the rant here and M-db, I don't make any of this statement toward you, in fact your points were quite valid. I've seen others slapped several times in other threads just the within past few weeks and its been on my mind. Bill, didn't mean to steal your thread. Good luck. Tim