Can I set up wireless without utilizing the internet? I want to connect my Macbook to my sound system & connect my i-phone (remote app) & control

I have attempted utilizing my airport extreme as a closed network for live music presentations. Wiring my MacBook to my BOSE L-1 system for background music and having the ability to use the set-up WiFi (without internet) as a closed network to give my i-phone the ability to control my laptop with the Remote App.

I have not found a way to set this up, every configuration seams to demand the internet connection.

QA AirPort Extreme Base Station

QA AirPort Extreme Base Station

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