Need help (including purchase advice) to amplify the signal from a tablet

Please see the attached Picture of the project

What i would like to do (in our kitchen)
1 Take the stereo signal from our Tablet
2 Do some amplifying (the amplifying unit (or units) has to be small)
3 send the whole (both left and right) signal to two independent speakers 4 Ohm
4 The ability to control volume via two independent pots at each end of the room
(the only things you see of the system is the two pots - built into some closets and the Tablet/phone


I have some knowledge but have never done anything like this before