Yes, works fine with my Icon Audio HP8. What headphones are you using?

  I say go with the HD. For me the HP is more for on-go use. One small package that does not take up a lot room. USB power, you will be limited to headphones just because that. Concero scales up very well. The better amp use, the better Concero performs.

Just installed some TJ Full Music 6SN7's with Genalex Gold Lion 12AX7. Must say, even with no burn-in the Full Music's sound better that my Sylania's 6SN7GTB chrome dome and my Psvane 6SN7's (to my ears). I still have to do the cap upupgrades.

  'Nuff said.

  Thank you. I was going off on the previous poster. But, we know where the real stupidity lies.

http://www.macrumors.com/2014/04/10/high-definition-itunes-music-downloads/   I'm ready!

Never had that happened on my Mac Mini. What other devices do you have on USB bus?

I have K702, and the Pan Am drives them fine. I also used to have Bravo, the Pan Am is in a entirely different league.

  That's so nice.

It is not a big difference, more refining of the Graham Slee sound. Giving it a more tube-like sound with smooth, velvety midrange and subsumed treble and awesome bass. Yes, you can obtain more control of your sound using a tube amp like the Crack, Pan Am, or Lyr. But, if you want the best of...

You make a good selling point for the Crack. Maybe I will think over before I spend my money.

That's was I heard. Have not heard a comparison myself.

I've been thinking about Crack, but, heard the Pan Am beats it with 650's, so, was thinking going another step up for my next tube amp like a Woo WA2 or the Icon Audio HP8.

I guess I am gonna try the Lyr. When you say the Crack is a different story, what do you mean?

  I tell people this maybe the ultimate pairing for HD650, including the Crack. They don't believe me.