'Natural' means nothing it is just a subjective term, qualify it with some specification, would a loudspeaker with a +- of .5dB from
20Hz to 20kHZ sound natural?
Keith
No, "natural" does mean something. As a descriptor, "natural" means that something does not seem artificial or man-made. Does telling someone that a rose looks "natural" mean anything? Of course it does.
Yes, "natural" is a subjective term, and it can tell one a great deal about how something sounds, looks, feels, smells, etc.
No, if that specification is the only thing you are telling me about a speaker, I have no way of knowing if it will sound natural. It might very well, but then it might not. I would need to know more about it and also to listen to it. Telling me a rose is a precise shade of red with a certain temperature and saturation does not tell me if the rose looks natural or, for that matter, what it smells like. I would have to look at it and smell it.
I think frequency responses are great for the speaker designers, and such a flat response may indeed help the designer to develop an excellent speaker. Room response measurements can also be very helpful to the listener when addressing certain issues with his room and system. I have read, though, that a frequency response which very gently rolls off in the highs does sound more natural to many listeners.
I don't think relying on such a definitive view leads to a better understanding of what is a very complex subject. We need both objective information and subjective experiences to better understand things.