Actually, for music, the REL T5 is more than capable. You just have to position it properly, ideally next to a corner. The reason why it's perfect for music is because it can provide you that bass punch wihout overwhelming you with that much LF. Those bass notes just disapear in the environment and integrates itself well with the music. It can be fast and accurate which not many subs can do. For HT purposes, it will lack the depth and SPL loudness that we crave for. I recommend the T5 for those bass-shy bookshelves.