Bryan,
I would greatly recommend you buy the Yamaha Sound Reinforcement Handbook (Second Edition, or whichever is the newest). It covers much of the basics of audio. A lot of answers to "why does this do that" can be found there.
I come here for audio-for-video type answers/insight and it has been a great help in that area. But I would recommend joining a forum that deals primarily with live sound/sound reinforcement. The
ProSoundWeb Sound Reinforcement forum(s) are a great choice; many industry professionals frequent the site. You would want to post in the "LAB Lounge" so you can work on your chops.
Feel free to contact me via my e-mail in my profile. (If it's not there, let me know).
Best of luck and keep on experimenting!
Wolf
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