I just finished making my speaker mounts for the my SC300, I'm going to be using Polk DB521 http://www.circuitcity.com/ssm/Polk-...oductDetail.do

As you can tell from the link these speakers have the Tweeter already, so my question is can or should I use the stock Pioneer tweeters with these speakers?

 

I'm still using my stock nakamichi tweeters with my alpine coaxiles up front. They still sound fine and i'll just replace them when I upgrade again to components...Apline SPR-17S!!!!

 

So it does not sound bad using both?

 

I went with components for better imaging but I may be wrong here when I say there is a good chance you will blow the factory tweeter if you skip a crossover.