I now own the X5 and the Custom 3. The X5 seem to have a little more detail on the top end than the Custom 3. The Custom 3 is a little smoother overall and maybe sound a little warmer. I don't own the X10 but I did listen to them at CanJam 2008. They seemed to sound a little thinner than the X5 and didn't go as low. That was only after about 5 minutes of listening so take it as you will.
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Headpones: Senn HD212, Equation RP21, Future Sonics M5, Klipsch Custom 3, Denon AH-D1001, Ultrasone HFI-780 with 18AWG Cryo cable, Klipsch X5
Amps: Sugden Headmaster, Headroom Micro Stack, Fiio E5
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