First, welcome to the forum.
Secondly, if you want help with designing stuff, a one-liner doesn't really go well with engineers.
You way wireless... ok, is that Bluetooth, Wifi, will you make your own wireless protocol ?
For headphones AND speakers.... what kind of speakers? What power levels are we talking about?
How will the audio be stremed to the hub ?
And more importantly, what do you actually need help with?