As I said in my review above (more than three years ago!), Fostex T50RP’s analytical-ness can make em sound thin, even mechanical. I still agree with that. But I forgot to mention here that I got a Class A headphone amp last year and it changed everything. When you pair fast planars with a smooth Class A amplifier, IMO, it counter-balances, and therfore you get the best of both worlds: Detailed naturalness.
My T50RP’s are still rockin’. Still here to stay. Still the best headphones I got to enjoy both detailed and powerful drum kicks in energetic music. 
