I have read a few comments here about sound bars, but did not see much that is fairly new. We just bought an LG 75qned85t TV and would like to add an external sound bar. The reviews we have read so far are pretty discouraging until you get up over $500 or so. Are there any less expensive ones that will improve the sound significantly? It is a bit disappointing to spend this much on a TV and have sub-par sound. TIA. john