[moot11]

I recently picked up HE-400 and I've been using it in my home setup. I find that it isn't very loud, so I'm assuming I need a better AMP. Should I take the vali from my work setup and bring it home (so that I'm only using the DAC at work)? I'm reading that the P7s don't really need an AMP. 
 
I ask because my old 598s sound a lot "better" and are much louder with my home setup. Maybe this may be due to a personal preference? 
 
Thanks!
 
Home
Xonar STX
HE-400/598s
 
Work 
Modi + Vali Combo
B&W P7