Conclusion
The HS1650 CU is an energetic sounding iem that is capable of producing impactful bass reproduction, lively midrange and extended treble. It boasts great details retrieval and provides an engaging listen. The treble presentation has nice sparkle which contributes to the overall vibrancy. In addition, its unique industrial design gives it a striking look. The packaging has a premium feel and it is very complete with an abundance of quality accessories. The Acoustune HS1650 CU provides a dynamic listen.
Audio123 Reviews 
how does this compare to ibasso it04? given that it04 has more drivers than hs1650?
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The HS1650 CU has a stronger bass impact and it is more lively.
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Thank you for the good pictures and a review.
Plz tell me, this thing can playing loud (without killing the driver)? I saw on the box 100mw is the max power. Some eims can handle just 25mw or less and they cant works on very loud level. (witout killing the driver) But for the street i need a loud thing. Now i use an iem with 50mw and its good on maximum level of my mp4 player. Very loud and i cannot hear the traffic. But its technikaly not a big thing.. I need a better one.
THX
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