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Looks like I'm going against the norm with this post. I own both the UE700 and UE600 and I'm waiting on the Tri Fi10 to be delivered by Amazon. If plenty of bass is the overriding factor you're looking for the UE600 has a warmer sound and a thumpier bass. The UE700 is closer to a neutral signature (not truly neutral in my book but whatever) compared to the UE600 but it won't thump like the UE600. The UE700 will give you far better detail retrieval though with nice fluid mids to boot and it's general sound signature is more aggressive compared to the more laid back sounding UE600. Which of the two you decide on comes down to what compromises you're willing to accept. If you want a warmer bassier sound that's more mainstream and easy to gravitate to the UE600 might be the better choice.. If you want a technically better IEM which brings better detail retrieval and aggression to the table at the cost of a less thumpier bass then the UE700 might be the better choice. Personally I love my UE700 to death but I won't fudge the facts, the UE600 has the thumpier bass not the clearest bass mind you but it can thump. Good luck hope my post was helpful
Bless
D.F.