On listening again, I think it's mostly the drums. They sound mono and a little muddy while there are some things (keyboards I think) that sound panned hard left and right and a little bright or thin. Any time you pan something hard to the sides they get a bit thin sounding when you sit close to the speakers. I don't know why. Anyhow, I think if you added some highs to the drums and panned the keys (or whatever they were) less extreme, it would sound thicker. Or I may need a straight jacket. Just don't give me an enema first!