Can't advise you about speakers but can suggest that the quality of the Recording, by how much it has been compressed, can make a considerable difference to the Reproduction.
No speakers in the world can make an MP4 file, or DAB Player, sound like a CD, or an LP, on a real HiFi Player. I doubt that this matters much if you are listening to Pop but for the rest of the music spectrum, the sky's the limit, and when you have your £50 Speaker Set, you will start thinking about what you could hear if you had a £100.00 set.
The definitive tests are, in my opinion are the Female Voice, the Acoustic Guitar and the Piano. All become flat if you are replaying using a lossy storage format.