heres a great post by alan i dug up:

http://www.axiomaudio.com/boards/showthreaded.php?Cat=&Board=Advice&Number=4788&Search=true&Forum=All_Forums&Words=amplifier%20difference&Match=And&Searchpage=0&Limit=25&Old=allposts&Main=4718)http://www.axiomaudio.com/boards/showthreaded.php?Cat=&Board=Advice&Number=4788&Search=true&Forum=All_Forums&Words=amplifier%20difference&Match=And&Searchpage=0&Limit=25&Old=allposts&Main=4718