I'm looking for an audio system for my room. Was looking to get a pair of speakers, a sub, and possibly an amp. I have the Fiio E7 which will at least be my DAC but not sure if it alone has enough to power a specific setup. Any suggestions? I am looking for <$300 for the whole package. Doesn't have to be super nice as this is very budget (and I know subs are expensive as hell) but would like to get down to the 20hz range if possible with the sub even if I sacrifice a bit of audio quality. I have a nice pair of cans to use but typically if I am playing through speakers I probably won't be super picky/paying attention to all the detail.