Generally I would expect a 'musical' speaker to do HT well... however there are some things that might be lacking:

1) Room Shaking, Heart Attack Inducing Bass is not always a requirement of a musical speaker... which is why HT usually uses Sub-Woofers...

2) Personal Preference - some people prefer speakers with a less obvious high frequency response for music, but find 'bright' speakers ideal for hearing voices clearly in a HT/TV Show....