I am planning on Alpine 9856, JL 300/2 to power either MB Quart PCE 216 or Infinity Perfect 6.1???

Both about same price, I like the midrange, and wants some strong midbass. Will also later add 10inch woofer with prob punch amp.

Dont know which to go with MB quart or Infinity?

 

You should go to a store and give them a listen. That's the best way to find out.

 

The Infinitys are MUCH better than the PCEs. If you were talking about the QSDs, then its a different story, but I dont think the PCEs are as good, and as clean sounding as the Perfects. Give them a listen, but I can bet money youll like the Perfects more.