I've spent the last three hours listening to several of my metal KZ's (ZS6, BA10, ZSA, ED8, ED9 & ED10) and I can tell you that all of them sound fantastic. I really should have pulled out the ED3 "Perfection" and HDS3 as well.
I was mostly surprised at how well the ED10 held up (forward treble, forward midrange with tight, deep and well-judged bass). I do hope that KZ revisits the ED10 sound signature because it is very engaging. A new KZ with a further refined ED10 sound signature, CNC aluminum housing and detachable cables would certainly grab my attention.
Again, props to Igor for the graph.
One of the tracks that I sampled with all of the aforementioned IEMs is.......
Every one of them handled the chimes (recurring @ 38 seconds) with differing degrees of sparkle with the ED8 displaying the least amount of shimmer and the ZS6 displaying the most. Each IEM has its own strengths but in general the metal housings contribute to a "clean" and detail-oriented presentation.......and yes that includes the ED8's presentation with its deep reaching bass.
Plastic housings would have ruined the ED8 sound signature but those metal alloy housings lend to their clarity. They were shipped with wide-bore Whirlwind eartips. The combination of wide-bore eartips and metal housings give them both air and a good sense of depth for a relatively warm sound signature . I like them. Alot.
The ED9 and ED10 rendered 'Til Tuesday's "Coming Up Close" with a great sense of presence and air.
Really looking forward to the up and coming ZS7. Let's hope KZ includes their new silver & copper cable with the all metal ZS7.