Sound is, very good I think, probably one of the best tuned set even in today standard. I personally have Viento-B and Viento-R, and I think each tuning especially A and B tuning were the most versatile. C and D can also work too if you like thicker midrange (and also accurate to B&K5128 standard) but for me it kinda too thick sounding. Viento as an IEM has it's subbass and highs as it's strong suit so I personally almost always using the B tuning. Bass is good for BA bass, and plenty enough even in A setting (but, again, more fun in B setting). Vocal is sweet and generally avoid shoutiness, and also come with smooth, airy treble. General tonal balance is pretty good assuming you get a pretty good fit. Layering is also strong suit in this set, where every instrument in the stage can be defined easily which is which and where it is coming from and playing on the stage.

9 year old since it release, Hidition Viento is an example where 'Good Sound Stays Good', proof that decently tuned IEM is still holding strong in time and ages, and still being one to consider for it's marvel tonality it brings to this date.

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