Seriously, the sound quality of old TV's has changed to those that are sold today. Just listen to this video I recorded, all from my Sega Genesis live on camera.
http://www.youtube.com/watch?v=krXjsuPIaz4
As far as I could tell, that is quite loud, and quite well in the bass and mid response, that new TV's just can't compete too. Most the new TV's have are just treble, and that's it.