Your iPhone 4 does not have 5 gig capability so it will only be in 2.4 gig band. This may be the cause of your dropouts. IPhone 5 is the first working 5 gig unit, yes 4S has it but it's useless for the most part. Check all the channels being used in your area and their strengths and maybe you can switch to a cleaner channel or get a iPhone 5. Your Mini iPad should be able to give you all the answers. This tells me that your iPad mini is setup for 2.4 gig. Are you also tied in with the school network for Internet access ? You only need it for updates or if you are downloading Music. Both can be done without constant internet connection. I would disconnect wire access from school net WAN port for performances.
I wanted to address this one specifically. First off, thank you for clarifying the 5 Gig limitations. I spoke with Apple, and even with the router being in a metal cabinet with the door open, it should reach up to 100ft. with no issue, so even on the 2.4 gig network, we should be able to narrow it down to what might be causing the drops. I'll work on that. I did want to emphasize that was ONLY with music streaming from my iPhone 4, and the MasterFader and MyFader apps worked flawlessly with my Mini and Iphone 4 from even the back of the 70 ft. Auditorium.
The other issue is, the school has blocked their network from being able to download from iTunes. Found that one out the hard way. The Asst. Principal logged into the school network with the iPad 2 we are using. We logged into her iTunes account. BUT...as we quickly found out, we were not able to download anything on the school's network, even if it was only to pull up her library, much less even download a free app.
I understand that there is a work around for that involving gift cards and special passwords from the Tech team, and I'm going to investigate that option today. Ultimately, we will need to have that iPad to at least have access to the MasterFader app for updates, so I might as well cross that bridge now.
Now..keep in mind, we ARE NOT reliant on that network...we have our own AE router, which is working well non-broadcast SSID. So, we've gotten over that hurdle to at least run the system from FOH.
The next step, in a perfect world, is to have the ability to log into the Asst. Principal's iTunes account through the school's network when needed, and have the PTO give her iTunes gift cards to cover whatever expense there may be associated with downloading whatever they need. I just have to get over that hurdle with the Tech Support group, and I'm hopeful we can make that happen.
I'm chipping away at the logistical hurdles. I don't want to lose sight of the fact that the system is really working well, and sounds magnificent.