Rock and roll speakers?

Buggtussel?

In an ideal world all speakers would play all kinds of music equally well. In the real world, it's sometimes a bit different.
The usual musical demands of Metal and typical chamber music can be quite different, and the same can be said for other musical genres as well.
When compromises need to made due to budget and/or space limitations, there are different speakers made with different balances of sonic assets and deficits . As no speaker at any price has yet to achieve perfect balance in all regards, it not surprising that at the lower end, the balances might be, well, less balanced. To ignore these differences can lead to less satisfaction for different purchasers with different priorities.

^Sure, there's no difference at all between listening to Barber Shop Quartets and Wagner. There's no difference listening to multimiked compressed pop music and Blumlein recorded symphonic music. Solo harp music and solo drum music. There's no point in trying to make better speakers, as all speakers already play everything well.
I think not.:-)

I agree with most that dynamic range and ultimate volume levels might be the biggest concern. Though as has been already pointed out, often times (though not always) proper amplification can go a long way in negating that concern. Another issue is frequency response, and whether the room can handle it. Yet another issue is how well a given loudspeaker can present a satisfying soundstage and imaging. Now this last item might be more of an issue to those that listen to music that is recorded in such a manner as to preserve it, and less so if the music is not recorded with much concern for these matters. IME, classical music is more often likely to be in first category and pop music more likely to be in the second category.