ANYONE GOT A TV SOUND BAR ?

hello , my speaker in my tv has gone so im thinking of one of these sound bars but have a few questions

Gotta be better then the standard speakers

I want to know if the volume changes off the tv remote , can't be ared with another remote . Also do they power off the USB port ?

What is one of these. Can u just but a multifunction remote!!
My multi remote control does loads.

Buy

Cant really say as to the remote.
Im using a bluetooth speaker thing that I just plug the tv into. Its far better and just uses the tv remote