Help me make a choice! Ultimate Ears Triplefi 10 vs. Monster Pro Copper
I would look at the Westone 3 before I would look at the TF10. The TF10 have good bass and highs but their mid-range is not very good, they are not that comfortable (actually pretty uncomfortable) and their sound stage is only average. The Copper's have very nice bass, a nice midrange, and sparkly treble (almost to hot and sparkly), they are more comfortable than the TF10 but do have their own challenges in regards to level of insertion.
You also might want to consider the Sennheiser IE8 which also are quite nice and were in my experience more comfortable than the Copper's and TF10.
Totally agreed, the soundstage of the TF 10 is very tips dependent, with a proper fit and the right set of tips ( Monster Cables Super Tips - Foam ) the only other iem I have heard with a bigger soundstage is the IE 8. In terms of size of the soundstage my W4 is on par with the TF 10, the W4 has more depth, but the TF 10 has more width.
it is because the stock cable is crap and worth nothing. upgrade them into silver cable or something better and the mid range improves significantly