My debug tends to make me lean forward to believe the unit has a fault ST jack:
As a matter fact, I tried the entire night and this morning, I finally
can hear audio under the following circumstances:
1) Can't secure twisted the ST cable into the 581, I have to pull the
cable out a little bit and after few tries, it's okay
2) Use a different cable (brand new) and result is the same (as a
matter fact I have 2 more ST cables, one will work and one will not
work whatsoever)
3) Using all the ST cables that I have and hook up to my older Wadia
860, no problem whatsoever with cable going in all the way
4) I make sure I use duster gas to blow out any dust in the Wadia 581
ST jack and clean all the cable with iso alcohol.