I thought this thread was dead when I bought my S-EM6's, but I decided to check in and I'm glad to see it's not!
Well, I think it depends on the treble you are looking for. These do have plenty of treble, but it's mostly located in the 6-9k region (stretching to 10k with silicone tips). Personally, I'm not a huge fan of it, so I do equalize these for a (relatively) flat response (frequency response of flat loudspeakers) but with a few extra dB in sub-bass and a touch extra in the upper treble. The mids are extremely close to flat in frequency response, from about 350Hz to 4kHz and it's obviously their strong point, so I'm happy to leave them as is. The biggest adjustment I make is a 6.7dB reduction at 8k, starting from 4.5k and finishing at 10k.
I think a screen shot will be much better, actually.
This is flat with foam tips and I have to say, it transforms these IEM's from great, to stellar. These IEM's do have the ability to extend low and retrieve tonnes of true detail (not faux-detail from brightness), but a lot of it is drowned out as they come.
Now, I know that EQ isn't for everybody, and a lot of this is simply my opinion, but it is worth giving it a try if you're up for some experimentation. I don't EQ for music, just for my headphones, as I want the best possible performance I can achieve. I don't see the point in going through a vast amount of equipment, just because it's a touch too dark/bright/warm/dry/thin/"insert adjective here" and leaving it all to luck/guessing, because even pairing dark headphones with a bright amp won't always match up the way you want it to. But, I appreciate that this can achieve good results with a lot of experimentation. Anyway, I digress. To bring it all home, I do adore these IEM's, just with the right configuration!