About the Zs5 being balanced or neutral?
I found this on the internet, is a good read, here's a snippet.
"A truly neutral headphone or speaker would reproduce every frequency of sound across the whole range of hearing in equal measure, with nary a decibel of difference between them. The laws of physics make this pretty tough. Every speaker or headphone driver is going to have its own voicing depending on the design, just as every human voice sounds different."
Credit goes to
https://medium.com/@Xander51/audio-...ole-your-brain-plays-in-all-this-2ec761759f7b
This is what etymotic is trying to achieve with their iems and using the Harman curve to adjust to the sound coming from inside the ear and not being affected by the outer ear.
It's widely accepted that an Er4S is a neutralish iem.
Now compare that to the ZS5 and you have a polar opposite in my opinion.
Ety bass is impossibly tight and controlled, mids are in line and highs are in line also.
Zs5 bass is enhanced and boomy, mids get overshadowed by the huge bass and highs are bright, sibilant and peaky.
Would you call the ZS5 bright? If so it's not neutral it's bright.
Balanced is just a quick way to describe to someone else that nothing is too out of place.
If something sounds balanced it does not suffer from something like for example, a tuning that is the old consumer tuning with enhanced bass and hugely rolled off highs.
So in summary a neutral iem does not add any colour to the sound similar to an etymotic.
To my ears the ZS5 is very coloured and one of the most coloured I've ever heard so I don't consider it close to neutral.
And for balanced the ZS5 has more bass and highs than it has mids so to my ears it is not balanced.