It’ll work but it’ll suck, save up for new speakers quick, you don’t need studio monitors any old hifi speakers + amp setup is fine. Music really isn’t designed for 5.1 systems. Especially cheap ones.
if you plan to use the 5.1 setup until you can afford a better speaker setup, youll need at least a 3.5mm jack to dual rca out (red and white male) connections. there, you can invest in two 1/4 tls adapters and hook it up that way. then you’ll get full stereo sound, but it isnt ideal. something like this:
Just use your computer’s internal sound card. Plug it into your headphone jack and bypass the S4’s sound card entirely. You won’t be able to cue tracks… but you’re at home so you don’t need to.
You really don’t need to buy studio monitors for at-home practice… Use your limited budget towards other controllers, PA gear, more music, or really anything else.