>>so far he has remained coiled under his log, but he just ate when i picked him up. is this normal for the digesting period or could he be stressed from his change of environment?
Do you mean he ate when you picked him up, or you picked him up, then he ate, or he ate, then you picked him up? Most balls won't eat while you're holding them (I've never met one that did), and some get too stressed out by handling to eat immediately after. You should wait 24-48 hours after the snake eats to handle it again, because like PHLadyPayne said, the stress will likely make the snake throw up the food.
>>would it have any effect to change out some of his accessories or can pythons grow accustomed to the items they were raised with?
Go ahead and change the accessories, but when you change the accessories, don't handle the snake. Limit the changes/stressful things in his life to one thing at a time. So a week after you rearrange his cage, AND he eats again, then once his stomach has settled, handling him should be fine.
>>also i have large speakers. do i need to worry about the proximity of his tank to these when they are in use?
Yes. If there's too much vibrating, like from the bass, the snake will actually become visibly agitated. I've been at a friend's house who had really loud speakers and a snake, and the second he started playing music, the snake came out and went as ballistic as a snake can get. The music even hurt MY ears, so I can't even imagine what the snake was going through.
Snakes 'hear' through vibrations, not sound like we know it, so the louder the music, the worse it seems for the snake. This is the same reason why it's so bad to tap on the glass of cages 
Also, just in case (I dono if you smoke or not) - avoid any kind of smoke in the snake's room. It'll likely lead to an upper respiratory infection.
Hope this helps!
~jenny
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"Polysyllabism in no way insures that what you're saying is actually worth being heard." - Blake (an e-friend of mine)
"I have never made but one prayer to god, a very short one: "O lord, make my enemies ridiculous." And he granted it." - Voltaire