Besides the Harman target curve for IEMs, there exist others, like for example the USound1V1 target curve (https://www.usound.com/how-headphones-should-sound/). It is used by oratory as well. I would like to know how and when it was devised. Just by the reasoning given in the link provided, i.e. elevating the bass below 300Hz and lowering the mids and treble? Was there any empirical research used as for the Harman curve? it is stated 'Additional research performed by USound and IEM showed that in the presence of background noise (such as distant traffic), listeners tend to prefer more bass and slightly less treble compared to the original Harman Target.' So without backround noise it is not preferable? Is it pure conicidence that the Sony XBA-N3 adheres almost perfectly to it?
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