^ They do appear to roll-off, but in fact are quite extended and simply somewhat overpowered by thick mids. But let's face it, tastes differ. I didn't vote for the SM3, because I listen to a lot of acoustic and classical (just like the OP) and don't think their sound signature suits these genres. Yet to the OP they sound great. Recommendations can only do so much, whenever possible it's always better to try for yourself.
Btw @firoze, I somehow missed the fact that you got the 1601SB. Did you post your impressions? (sorry for OT)
Greetings James, nice to hear from you... Yes I got the 1601's in March last year and did post brief impressions here:
Maybe you missed it. I had intended to post more detailed impressions but then I got so busy with work that I could hardly visit here. Anyway, I have been thoroughly enjoying the SB's! But I also need earphones with very good isolation. Pity the FAD BA'a don't isolate well, else they would have been my first choice. So what would you recommend?