More treble also? Why do you say that? Any reference? Thanks in advance.
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No, just my own experience with a portable speaker (JBL Xtreme).
I found that inside, I needed to turn down the treble, but outside it sounded better w/o EQ. I would guess the loss of reflected sound is what makes the difference, but there are lots of other factors, including dispersion and placement in room and outdoors (relative to a ceiling or wall) which may be a bigger factor than I am giving them credit for. Outside, I usually have it on an outdoor furniture end table and >25' to the nearest wall (for use by a fire pit).
The treble that is too strong inside presents as providing a nice level of detail outside, to my ear.
The same is true of the bass. It is too heavy and gets boomy for inside use, but is nicely full outside (for a portable bluetooth unit).
Since it is JBL/Harman, I figure they know how to get the FR they want, so took this as a lesson that for a speaker to sound good outdoors, you'd want more bass and treble (the speaker is rugged and splash-proof, so I think "outside design").
However, this is far from a rigorous conclusion based on research, or evidence from a statistically valid sample size, so take it with a grain of salt (and please share if there is contradictory info)!
Thanks!