I would have returned my XCs the first week I had them had I been able to. In also have TH-900 and I expected the heaven and the earth to part with the XC . Alas only the heavens did, the low earth nowhere to be seen. Lol
But after breaking in and times spent with the XC the bass is there in there just not overpowering. Now I love them.
The TH900 are my fave for heavy rock and metal no doubts .