Basically these reviewer have asking for a more balanced planar sets since PLA13 is out. they note the driver is capable but the tuning ruining it. They also shared their EQ preset for Pla13 to make it closer to their prefered sound sig. among these reviewers are PaulWasabi and Practiphile.

PR1 Hifi later released with sound sig that was closer to the reviewer demand but still dig deep in fun v sound. So the reveiwer continue to ask for more balanced sound sig as well as sharing the EQ preset for it.

and now KZ finally released the more balanced PR1, the PR1 Pro who apparently straddles PaulWasabi and Practiphile prefered sound sig.

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One thing they lament is KZ have EDA-balance and EDA High-res which are quite the darling in their community. but their decision choose not to continue the balanced sound sig bloodline is beyond me.

this hits back to KZ as one of the new budget kings TangZu Wan'er is basically TangZu takes on Eda-Balance tuning. There is also SGOR Venus who apparently using the same driver but tried to improve the tuning of Eda-Balance who are also have their little hype.