I think the music should dictate the frequencies - not your own judgement. In this case, the extension from the speakers should always be higher than that of the recordings. For good transient control, you need high system bandwidth - the higher the better.
But the thing you are forgetting is the room. It ultimately will dictate the extension regardless of what you think it should be or what your speakers are rated at. Typical in-room measurements using an averaging technique will show that most rooms start to roll off the treble around 9kHz (like my room). The amount of furniture and the texture of the materials will change it up or down - but generally down is much more likely.
Arthur
But the thing you are forgetting is the room. It ultimately will dictate the extension regardless of what you think it should be or what your speakers are rated at. Typical in-room measurements using an averaging technique will show that most rooms start to roll off the treble around 9kHz (like my room). The amount of furniture and the texture of the materials will change it up or down - but generally down is much more likely.
Arthur