Sonywalkmanuser
Headphoneus Supremus
I never heard it on my ZX2, ZX100, 1A, ZX300, and 1Z. The ZX1 kinda has that metallic treble.
I started on Sharp 1bit digital Minidisc player.. it was like the first class D portable player.. It had even more noticeable metalic treble and hissing.
I think Sony has improve the S-master HX amp alot.. It used to lack dynamics and treble back in the NWZ-X1060..
ZX2 doesn't have metalic treble for most part, but still does suffer from congestion/brittle treble if the amplifier is push very hard(think complex EDM or Dance music).
Speaking of Metalic Treble.. example of how it sounds like(yes, it's all Class D amps):
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