True.For loudspeakers there isn't and can never be a single target as the response at the LP depends on the directivity of the loudspeakers, the reflectivity of the room and listening distance, the only reasonable target for loudspeakers above transition frequency is linear direct sound and smooth directivity, more about the topic here.
About below the schroeder frequency:
our eyes sees the room and expect it to sound with a certain bass tilt. Ultimately, one need to listen to the cello or electric bassguitarr and judge the bass quality and maybe change it with a dsp or the placement of the two speakers. Pink noise is unfortunately a very bad tool to judge how the pitch of a cello will sound.
Also - our inner sound reference are always colored by the speakers we normally listen to - so the circle of confusion is very real, starting with the owners loudspeaker that might lack bass below 70 Hz . This is good to know when you listen to a new speaker in a store , it will take about an hour of listening in the new room with the new speaker to be somewhat free from your own ”at home loudspeaker sound ” bias.
This is something that true for all of us.
To make it even more complicated, and if we go further than Toole/Olive:s research, - two stereo loudspeakers in a room can sound very different because of the setup in the room . As an example - If you have the same room and the same loudspeakers but change the distance between the speakers with 1 meter, you gonna have a massive change in tonality in the bass region and the stereo Illusion will be very different.
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