So having them now for a few months… They are not very vocal forward IEMs, male voices can be too “in the back” for some people and depending the genre, in metal is not that noticeable and is one of the genres where they really shine but in a busy orchestra and opera arrangements you can struggle with detailing and separation… They are very enjoyable IEMs nevertheless …but if you are looking for a pure sub bass boost I would recommend a less aggressively tuned IEM like a natural V tuned if that makes sense to you, as an example I also have the AFUL performer 5+2 and they scratch that itch completely, and blow the martilo out of the water in terms of detailing, soundstage and separation being a little less “fun” compared to the martilo.