Yeah, I think it's because the filters roll up starting at like 3-5k (don't have a graph in front of me) To be honest, I've owned many Shure products, started with the first E5 like back in 2000, I've owned most of the e5 series since, also a few 215's for on the go phone IEM's. Shures have always excelled in mids, because they were first introduced as live performance IEM's and tailored for vocalist, all the pairs I've owned including the 846's have a bit of a "veiled" sound, it's just the "Shure" sound. I do feel the SE535's are the brightest model they made but lacked in low end...nothing that EQ couldn't fix though. I personally feel the 846's are a great fit for me, they are not the best at everything,,,I haven't demoed anything that is though, that's we we audiophile types spend too much money on gear...Options.
Cheers!