Audiophiles hifi appreciation thread old and new

I've got a mix of really old Amp/CD/Cassette/Record deck cobbled together years ago with some floor standing speakers. All decent stuff in its day.

The whole set up takes up loads of space and has cables/phono ins/outs 'round the back' that spiders have visited more often than me.
I'm looking for a simple 'up to date' replacement solution

Sorry - my question was not very clear
I don't necessarily need the Cromecast thingies that allow you to wirelessly use your existing speakers for playing web based stuff.
I want to use my existing (old) HiFi separates and existing (old) speakers without all the cables.
So what I understand would be some form of 'converter' - analogue >gadget>speakers

Does such a thing exist ?

bear with me