Good source will sound better on mediocre speakers than mediocre source
I consider my CD player and TT mediocre and they sound great with good speakers and bad with OK speakers. So I guess it depends on the definition of mediocre. To translate this to numbers:
$200 CD player - $1000 speaker or
$800 CD player - $400 speaker?
(as speakers budget shouldn't be 1:1)
Note, I didn't forget one "0" from each number - that's what I meant 😊