An unpublished Rolling Stone interview from 2014 has been published that is extremely revealing. To me, the quote below suggests he wasn't entirely happy with the sound of Studio A. I do think that some of his most recent recordings have a dryer and clearer sound, so I'm wondering if he changed the room or went elsewhere to record vocals. If anyone has thoughts or insights, please let me know.

"This room was built in '87, and the first record I did in here was Lovesexy," he says. "We never really got this room clickin' like any of my home studios or the hot-rodded boards I used in Los Angeles when I had a record deal. It's real cozy and private – I just kinda wished it sounded like what goes on in my head."

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The RS story was previously discussed here http://prince.org/msg/7/424686

Just in case there's anything there that might answer your question.

Are you the Alex Hahn who wrote a book about Prince?

Also specifically, I think Prince was referring to the mixing board which an engineer recently said was new and didn't have the same sound with the way Prince was used to quickly working in his home studio ways on an older board he was used to.