Yes, you have 6.5 speakers and I think you have tweeters too. You can make cheap speakers sound good, but most of the time they don't end up that way. I would suggest component speakers and placing the woofer in the door. Then put foam soundproofing behind it. Soundproofing will make the speaker sound better because the door acts like an enclosure. Ever see a speaker that wasn't in a box? Same with the speaker in your door.
Don't buy the mat soundproofing at the store because it is a rip off. Read this and you will learn a lot about soundproofing. I can't make a writeup on speakers since there is already a lot of informatinon out there and they are constantly changing speaker models. http://www.myturbodiesel.com/1000q_how_to/multi/soundproofing.htm
Yes, better speakers sound better, but I would rather spend the money on the enclosure. Otherwise, the better speaker will still sound muddy and you still won't be able to hear it without turning it up really loud.
VW TDI forum, Audi, Porsche, and Chevy Cruze Diesel forum
A forum community dedicated to Audi, Volkswagen, Porsche, and all turbo diesel owners and enthusiasts. Come join the discussion about performance, modifications, troubleshooting, TDI, maintenance, and more!