What is inside a sound bar?


and how do they work?
I know they are some type of speaker, but WHAT are they? (I have "GOOGLED" but could not find a cut-away view). Do they contain speaker cone drivers or are they electrostatic? Is anyone looking into these?Do these have HE potential? I like the idea of speakers that can hang on the wall and still produce high quality sound.
6550c
Do try before you buy. I bought a used Yamaha 1000 soundbar and can't get a realistic sound in our room. Maybe the Audioengine A5 powered speakers might be worth a try.
a pal of mine has a jvc soundbar + wireless sub + wireless rear setup and it sounds very decent for tv and movies--genuinely immersive surround. i think he paid around $450 online. obviously, a quality conventional wired ht system is gonna sound alot better, but if i was budget constrained, or didn't want to hassle with a seperate avr, cables, etc., i could live with something like this.