[Nimweth]

A very good question.
I have some pieces of answers (partly subjective) - I will add them here tonight after a family trip.

*Updated:.
First, there is a difference between electronic/digital recordings and acoustic ones with live instruments.
For the former there are no frequency limits - deep sub-bass (below 30-50 Hz) and the last octave (10 to 20 kHz) can be plentiful and well-defined. For those, a neutral signature, like that of Crin's tuning oreferences (exemplified to me by Dioko or reasonably by Hola) will do best as transducers.
By contrast, acoustic tecordings of subbass require large oscilating structure and proper mics to capture it, as well for the last octave, not so much overtones are there, while sibilance present a lot of problems for mics to record cleanly.

Now, many good classical recordings present a more extreme case of acoustic recording made for older acoustic reproduction and vinyl, as nicely pointed out by @Nimweth here.
In the Science forum, I was once given a test file of the "epitome" of the golden recordings - revelationaly, nothing above 10 kHz, and very strongly tapered above 3-4 kHz. This was done to cut vinyl noise and to concentrate on mids, where the 'core information" is.
Correspondingly, transducers that enhance treble, largely so from 1 to 4 kHz (where there is something to enhance) work well; reproduction past 10 kHz is really needed. Translates to a seemingly crazy pina gains of above 12-15 dB *but works, IMHO).

(Now, there are definitely modern audiophile classical recordings that already enhance treble and use closer mics fir more overtones - so they will work better with different IEMs, I did not encounter too many of prominent cases though).

Then multiple transducers work well to separate abd reproduce more overtones, as pointed out below.

So all-BA work well. To me KZ AS16 is the epitome of an IEM for classical music.
BA10, a newer version of AS12 and AS16 pro are also great.

AS16 pro may be the one to try, if you did not experience it. If liked and leaner and more treble enhanced - AS16 original. If more eefinement is needed - more expensive all-BA may be the way to go (where I have little experience), I do like some roughness and granularity in IEMs - works well for me for violin recordings.

I am replying to answer your post and @requal earlier. I agree with what you wrote here in general although I would say that an extended treble response takes in harmonics produced by many instruments and results in a more accurate reproduction of timbre. It depends on your preference as you mentioned. I find large scale orchestral works sound more satisfying with an extended bass with natural decay. This is most often met with in dynamic drivers so in this case single DDs I would mention here would be Fiio FD3, Heart Mirror or Moondrop Aria.For the best of both worlds hybrid/Tribrid models such as TRI i3 Pro, Geek Wold GK10 or MT300 may be suitable. With smaller scale works BA types work well for me such as AS12, BA10, TRN BA5 and X7 or at a higher price, Hidizs MD4. All based on my tastes, of course, YMMV.

 

[requal]

Thank you for you both! @Nimweth @PhonoPhi

Roughness and granularity". - something like this is what I'm looking for. I couldn't exactly define what it is. Why were the ZS6 (probably the V1) then able to grab my attention and make these sounds flow to me?
I need probably some micro-detals boost, or iems with some higher frequency boost. That's why I thought it was worth asking someone who lives it.

For my electronic music, I'm chosing balanced tuning (for example Tripowin Olina SE) without a lot of boost at the bottom and top. However, classical music "doesn't grab me".
Indeed, this is less true of large-scale orchestral music. This one appeals to me.

 

[Podster]

Since all mine seem to be could we maybe have KZ Classics day today my back up portable rig today iPhone 6 w/KZ DT-5’s. Far better than one might think

 

[Nimweth]

Since all mine seem to be could we maybe have KZ Classics day today my back up portable rig today iPhone 6 w/KZ DT-5’s. Far better than one might think

Ha ha, I'm currently using AS12 with Hidizs AP80 Pro X.

 

[chinmie]

My D-Fi has arrived (that was quick!) and i did some tests with the switches and also try pairing it with AZ09 Pro.

I can confirm that the difference between switch 1, 2, or 3 up are so little that didn't see the point of it, and their effect don't seem to stack with each other. So i feel you could choose either one of them on.

The settings that i like are DDDU or UDDU for slight bass boost.
I don't like the DDDD, so i don't think i would like the non tuning D-Fi version

I'm using my Topping G5 for testing, and i also like it paired with the AZ09 Pro

 

[r31ya]

Oh lord, KZ PR2 is coming... as KZxHBB the sequel~!
https://www.kztws.com/products/kzxhbb-pr2
Ali store link
7 days Early bird discount at $46~48

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I wonder how the published graph looks like compared to PR1 Pro?
and "smoother and natural sounding", if they manage to smoothen PR1 Pro harsh-ish sounds... that would be killer

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KZ PR2 published graph compared to KZ Pr1 Pro with stock foams courtesy of PaulWasabi

 

[Podster]

That PR2 looks interesting

Little face plate swapping and cable upgrade really classes these 6's up imo Man, I really need to look at tip cleaning before posting! Seems to be a critter or something in that Starline Sorry, I'm stuck in classic (Time) mode

 

[Atek2019]

Oh lord, KZ PR2 is coming... as KZxHBB the sequel~!
https://www.kztws.com/products/kzxhbb-pr2
Ali store link
7 days Early bird discount at $46~48

---

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I wonder how the published graph looks like compared to PR1 Pro?
and "smoother and natural sounding", if they manage to smoothen PR1 Pro harsh-ish sounds... that would be killer

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KZ PR2 published graph compared to KZ Pr1 Pro with stock foams courtesy of PaulWasabi

Hopefully KZ PR2 has deep sub bass

 

[Carpet]

Hopefully KZ PR2 has deep sub bass

If you want more bass then the earlier PLA13 and regular PR1 have that that. PR2 graph shows slightly reduced mid bass, less pina gain and reduced treble. Sub bass should be more prominent due to treble reduction. Harmonics should be more prominent if upper treble 12-16kHz increase is accurate.

TL DR; wait and see, all from KZ supplied graph so far

 

[r31ya]

If you want more bass then the earlier PLA13 and regular PR1 have that that. PR2 graph shows slightly reduced mid bass, less pina gain and reduced treble. Sub bass should be more prominent due to treble reduction. Harmonics should be more prominent if upper treble 12-16kHz increase is accurate.

TL DR; wait and see, all from KZ supplied graph so far

Pla13 is the bassy, dynamic driver sounding Planar in KZ/CCA line up.
in retrospec, its kinda impressive that KZ/CCA have Planar that sounds smooth enough that people start wondering whether its Dynamic Driver.

KZ supplied graph will have wonky scaling presentation but usually pretty accurate.
One time it deviate so much is when KZ forgot to check/test on low power source and it cause some drama.
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[Hustler]

Hopefully KZ PR2 has deep sub bass

Hope so, but judging by the graph it will be possible to boost the low frequencies with silicone tips, while keeping the highs fairly safe. I'm not a fan of foam tips, so I'll change them anyway.

This graph someone posted on facebook group - it looks really nice and that peak at 15 kHz should give nice sense of space.

 

[r31ya]

Its confirmed by KZ Rep that KZ PR2 is mostly retune of KZ PR1 Pro.



There are minor alteration in the driver (possibly that included PCB board) to make the graph result a bit more consistent it seems.

 

[lushmelody]

Pla13 is the bassy, dynamic driver sounding Planar in KZ/CCA line up.
in retrospec, its kinda impressive that KZ/CCA have Planar that sounds smooth enough that people start wondering whether its Dynamic Driver.

KZ supplied graph will have wonky scaling presentation but usually pretty accurate.
One time it deviate so much is when KZ forgot to check/test on low power source and it cause some drama.
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Pla13 is so overlooked. Its a solid budget basshead set. I think it suffered of bad timing... If it was launched today would be more appreciated

 

[r31ya]

Pla13 is so overlooked. Its a solid budget basshead set. I think it suffered of bad timing... If it was launched today would be more appreciated

Yeah, with the current batch of basshead iem,
It should have better companion to be compared against. Pla13 unfortunately was compared to more balanced iems

 

[Atek2019]

no more foamtips ???