theres no way your 300watt 6x9 are actually 300 watt. You should always have a more powerful amp than speakers, the reason for this is you can draw too much out of an amp and although it may sound good you get clipping. this is very bad for the speaker. You want the biggest amp you can afford. a decent set of components, no need for any back door speakers either. If you turn the volume up too much, it will sound shit and distort, this is where you turn the volume back slighty. For bassed you need a sub, and may as well just use a class d amp to power the sub.