Q u o t e: The voice of Tyrael was heavily modified to sound "angelic" and whatnot, so the original actor could be easily replaced to sound just like the Tyrael we know. This is a non issue, c'mon guys.
Except they added a little bit of delay effect on it, the actor's voice was not changed at all, that is his real voice:
http://www.youtube.com/watch?v=TlnhPpxEW2k
- De Gustibus Non Est Disputandum -