My new Shure SE425 sound awful. I just got them yesterday and have probably put in 8+ hours already. I just can't stand how they sound. The bass is extremely lacking compared to the SE215's I had. The mid range is not just forward but also sounds extremely unnatural. The treble is not particularly clear and it's laid back. They just sound bad. I've tried my LG V30, an iBasso D-Zero, my HiFimeDIY Sabre Optical Dac > Antique Sound Labs MG Head OTL MKIII tube amp and my friend's Fostex HPA4. Has anyone had experience with this? They are brand new, but I hear IEM's really don't need any burn in. I have tried all kinds of music and the source quality is fine. I side-by-sided them with my SE215's and while there is an improvement in mid-range clarity nothing else sounds as nice on the SE425. I think I will return them and try the SE315.