hi there
i think 5 inch monitors like krk rokit5 is something good for the bedroom, studio, these guys are loud enough to work with, and they also have a good bass,
however, you cant expect a 5 inch krk speaker to have deep bass like a 10 inch one, or subwoofer, it has a small box, it cant have too much deep bass
a subwoofer is the king of the bass,
but when you have experience you can also mix on headphones, because you know what you doing,
and even with no bass at all you have the spectrum, visual analysers that you are not extreme depended on monitors
i think a 5 inch pair of krk, with a krk sub would be extreme good for a bedroom, but you can also work without sub
if you have like a giant room maybe you need bigger speakers for more loudness without distortion, like 8 inch or maybe even 10 if room is too big , but small rooms can be filled good enough with a 5 inch pair
if you only make beats and mixing, you can use rca unbalanced cables
if you also want to record , it means you have to get an audio interface and you use that for speakers as well with balanced cables or xlr