The anechoic and/or quasi-anechoic measurements people are used to seeing are supposed to be flat.
In a room you should have a descending response from around 100-150 Hz. This is what all of the automated room-correction software tries to do, more or less. They don’t attempt a ruler flat response for exactly the reason stated by the OP.
There are some other things going on in tweeters I'd like to mention though.
B&W and some other "high end" speakers use a ragged tweeter response designed to elicit a sense of detail. This is a trait I blame Stereophile for hyping/promoting as "neutral." It isn't.
Brands which shy away from this kind of tweeter trickery are Magico, Vandersteen and YG Acoustics. However, that doesn't mean the rest of their response is ruler flat/accurate either. Just that they at least don't try this hyper-detail trickery. Of course, I call it trickery, you might call it a wonderful feature. :)
Having said all this, I also find that the floor area behind/between the speakers is an unexpected place for harshness in a speaker sound. If you have a solid floor or rack between the speakers, it’s worth experimenting with blankets/pillows in the area.
In a room you should have a descending response from around 100-150 Hz. This is what all of the automated room-correction software tries to do, more or less. They don’t attempt a ruler flat response for exactly the reason stated by the OP.
There are some other things going on in tweeters I'd like to mention though.
B&W and some other "high end" speakers use a ragged tweeter response designed to elicit a sense of detail. This is a trait I blame Stereophile for hyping/promoting as "neutral." It isn't.
Brands which shy away from this kind of tweeter trickery are Magico, Vandersteen and YG Acoustics. However, that doesn't mean the rest of their response is ruler flat/accurate either. Just that they at least don't try this hyper-detail trickery. Of course, I call it trickery, you might call it a wonderful feature. :)
Having said all this, I also find that the floor area behind/between the speakers is an unexpected place for harshness in a speaker sound. If you have a solid floor or rack between the speakers, it’s worth experimenting with blankets/pillows in the area.