play music from HDD to active speakers controlled by mobile

Hello guys. i don't know the name of this or what device i need to make this happend.

i'v got active spekres. (toslink, coaxial and rca input)
i'v got music library on HDD.
i'v got android box unused ( toslink output, maybe i can use this?)
and i'v got my mobile phone.

so i want to play the music from the HDD to active speakers, i don't know how. maybe raspberry or minipc?

and i want to manage the library and play the music from the hdd with my mobile

max budget - 150€. ideal budget <100€

anyone know how i can do that? is the posible with that budget?

thanks
 
Raspberry + hifiberry Digi+ (or digi2) + volumio + USB HDD enclosure will do the trick if your speakers do not require separate toslink cables. You can check volumio's site to decide if it fulfills your requirements for library management.