It is time to put an end to the ridiculous urban legend that Def Techs are "not good for music". Anyone who thinks that has obviously either not heard them at all or not heard them set up properly. In fact, they are at least as good for music as any comparably priced towers, whatever the brand.
The big problem is speaker placement and room acoustics.
Some rooms are great, while others are terrible. If you listen to DefTechs in a good setup/placement and acoustics, they will sound great. Otherwise, they will sound terrible - just like all speakers out there, including B&W 800 series.
For example, if you go to Audio Dimensions in Norman, OK, you would think that B&W speakers sound terrible. If you go to Audio Midwest in Edmond, OK, you would think Paradigm speakers sound terrible. Is it true? Well, in those rooms and with those setups, yes it is true. But in better rooms and setups, they will most likely sound excellent.
That's why some people say that DTs sound better in a bigger, better HT environment - probably because the speaker placement and acoustics are better.
Certain speakers will fit certain rooms better than others. The OP just needs to make sure it fits well with his room.