Listening to the HPA-01 through TH-900 and source A&K 240. Playing DSD albums right now it's JT beautiful vocals, bass and guitars playing against a black background makes me smile and tap my feet. Favorite track is Secret O' Life. On the best of Marvin Gaye What's Going On, the sax intro to Marvin's strong vocals. Brings me back to the good old days when life was simple. On the rock side, the Division Bell, Pink Floyd What Do You Want From Me, David's guitar work and vocals really shine. In my opinion the HPA-01 makes the vocals stand out. Used the TH-900 with the voltage output. Tried the current with my HiFiMan HE-500 it does make a difference in sound. Looks like the best of both worlds. I'm happy with this buy.
jonasTo my ears it just sounded way better with the voltage output vs. the current mode on the Fostex. I haven't tried the beyerdynamics or the Fostex TH-600 yet. Too many headphones so little time.
uruma72I see. Since I have TH900/T1 as well. I found this amp is super with current mode for T1. And I am using current mode for all phones... Your comments drive me to have a try with my TH900 on voltage output as well.