I don't mean to disappoint you, but you got pretty low end stuff and I think you may have expected too much out of it. A friend of mine just installed Pioneer TS-D1702C in his car, they were only $100 shipped and rated at only 60W per side. Given they are being powered by a better amp, but I can guarantee they will be loud enough for you. Sony makes pretty bad car audio products and that's why they're never recommended. I wouldn't get better speakers with that amp and I wouldn't get a better amp for those speakers. If you want louder and better sounding, I'd get other equipment.