The HA-1 shows the correct info with 3 other laptops, a MacBook Pro, a MacBook Air, and a Windows laptop. I haven't tried another coaxial source with 24bit files.
From what I remember when I owned the e17 it always displayed the incoming source as 24bit. This is a known quirk (if I remember correctly).
The HA-1 is a very capable amp and it's coaxial, optical, and AES/EBU inputs can all accept 24bit PCM.
EDIT: Human error!
Edited by x RELIC x - 5/15/14 at 4:03pm