The M50s feature emphasized upper mids and treble which became harsh and grating when used with the V2, at least with the stock tube. As I said in my review, it wasn't a problem of the amp or the headphones, themselves, they just didn't mate well together. I've been using my Fiio E9 as my primary amp for a while now and haven't yet tried the M50s on the Bravo V2 with an upgraded tube (eBay seller said it was an RCA Black plates tube but I honestly have no idea) that sounds smoother to my ears but once I do, I'll report back.
I've been listening to the Bravo V2 and the M50 for 3 hours straight now. My bravo has a 1950s RCA clear top tube and I can only say it sounds absolutely great.
The sound isn't harsh in anyway, bass is just great. Soundquality at work has drastically improved (I wonder why I didn't take it to work sooner)
