Some of these tasks were already done, still for future shows, it's good to have a list of required tasks ready.
For the media player, I was able to get the WD HD Element Play at the end, it functions well. I heard a lot of bad reviews about iomega, even though every other store here sells iomega and it was harder to find a Western Digital.
Tip for the future 1: Regarding the speakers and every other electronic, always test the product either in store or directly after you reach the house; Speakers weren't functioning, and the exchange was valid for a period of 10 days, the guy was nice enough to accept to exchange these.
Tip 2: Indoors speakers won't do a good job for outdoors, especially if we are working in a public space.