Hi
Soundbars are meant to enhance the TV experience in terms of the low outputs which nowadays Plasmas & LEDs have.....obviously cannot be compared to even an entry level 5.1 system....
There are powered speakers available in the combination of 2.0 or 2.1s.....check out Swans....
JBL, Harmon Kardon, Samsung and Yamaha have good soundbars...depending on your budget....audition and decide....