The narrative voice was recorded differently to the character voices.
There are two people heard in that book.
Me on narrative, and an other guy on everything else.
My narrative was done with the sm7b in the real nice room, and the other guys stuff was done with
the sm7b in a very bad room.
His parts took a lot longer than mine so I couldn't really book the studio for him, plus his parts are almost always blended with music, sound effects, ambient reverbs etc. The bass is always cut back on character voices too.
I found it made the starting quality a lot less critical.
Funny, I made some rockwool panels last week and setting those up immediately reminded me of the uni narrative sessions.
Check this out.
http://www.steenaudio.com/rockwool1.wav
It'd be fair to say this roughly equates to the difference between character and narrative voices.