There is a way to make your music sound better. Well, OK, there are LOTS of ways to make your music sound better. If you're looking to improve your digital music, beyond new speakers, amps, and so on is a bit of technological wonder called the DAC, or Digital/Analog Converter. This is what turns your music files into something analog you can actually hear.
Receivers these days tend to have built in DACs, but just because they're there doesn't necessarily mean they're any good. A great sounding DAC can smooth out your digital audio, making it sound more natural and realistic.
Firestone Audio's tiny ILTW packs a lot into a tiny frame, for not a lot of money.