Doc-z
You are right. When you are competing with noise in a pub or a large crowd, of course you cannot use the Logitechs. As for 10" speakers, one of the top notch systems, d&b of Germany has to 10's in a pair of tops I heard here in Norway, and it was the best portable system I have ever heard. You cannot generally speak size and quality, too many other factors, driver size, type of driver, material etc.