A musical sub is tight (doesn't blur the notes) and fast (doesn't sustain the notes longer than the program material). This would be more acceptable with explosions and the like than music.
A well designed sub can do both.
I agree with Dewd. The 8" Push/Pull M&K that I just sold was supposed to be a "musical sub" I did not know what I was missing til I got the 500. THe M&K was boomy no matter what sound it was reproducing - musical bass or volcanic eruptions. THe guy that bought it - when he contacted me said he was looking for a musical sub. I just smiled and took his money.
