Can any ice sifu explain what is the usage of this?

does it really make the sound better than the one without the preout?

if yes, what brand or model to consider? budget not more than 800

thanks in advance

ic....
so in order to get better sq, 4v preout is important

any recommendation?

just installed eclipse cd3000.
far different from my stock blaupunt cd player with stock cheapo speakers.

damage 870 with installation

next project, the component set.