I use the iBasso T3 with Shure 530 and Cowon players. Works really well, the amp adds nice bass that sounds more natural than the mach3bass that cowon players have. So I only use the iBasso amp, no extra sounds enhancements from the Cowon players, and the EQ on flat. But I don't know about the HD650..
11/22/09 at 1:53pm