Electronic Musician, Keyboard, and Eq are good magazines, those are my top choices. Recording is pretty good. Mix usually gets really technical. I subscribe to:
Keyboard, Home recording, Recording, Mix, EQ. The only downside is they all have reviews of the same products pretty much. A couple Times I've seen the same exact review word for word in 2 different magazines
I can't tell you how much time I spend reading these at work, I read that shit front to back. I'm always tryin' to keep up on new technologies, Plus t's great to hear about other techniques that other Engineers and Producers are using