So they do or don't require 150 hours of burn in? Your two posts say the complete opposite. I did let this thing burn in for about 10 or 12 hours straight (at least) and I still heard very little difference. It wasn't like I just pulled it out of the box and started testing. I kept it for a full 2 weeks and let it play all the time. Didn't seem to make that much of a difference.