I helped a friend set up an Onkyo HT-S790 HTiB 7.1 system. We checked it with Gladiator, the "Battle of Carthage" chapter. I was impressed with the dynamic sound of the speaker system that comes with this system. The sub is adequate, but the sats sounded very clear. The swords and noises seemed to jump out of the speakers. I have Polk R15 sats and a Polk C120 center making up a 7.1 system powered by a Kenwood KRF-X9090D AVR and they don't sound nearly as dynamic as the Onkyos. The Polks use a "3/4" silk/polymer dome tweeter", while the Onkyos have a "1" balanced-dome tweeter". The Onkyo tweeter appears to be made out of a brown plastic. They don't seem to be as expensive a speaker as the Onkyos. Can someone tell me why these speaker seem to sound more vivid? Am I being seduced by "cheap" speakers? And if so, are there better speakers for HT than for music and vice-versa? Thanks for your replies!