I love the work of Dr. David Griesinger of Harvard University as it concerns his work with Lexicon, Inc., in developing reverberators, simply the finest of their era, as exemplified by the 300L and the mighty 480L.
I also love female vocals when recorded with close-mic technique and the use of high-shelf equalization fed into said previously-mentioned reverberators, where the sibilants and open glottal vowels lead to the creation of a kind of “vocal frost.”