as far as a sub goes i recomend a 10 inch alpine type r sub in a ported box. hook this to a 500 watt rms alpine amp and you have a great system. im running this in my truck and i have more bass then one of my friends who has two 12s, and it sounds better. it doesn't matter the size of your sub if its not set up correctly with the right power going to it. i picked up my sub and box brand new never mounted for $100 off craigslist and bought the amp new for $150.