I have had the JL C5-570CSI and ZR-650 and they are both very nice sounding components.
C5-570 are 5X7 with 3/4 silk tweeters. These are as good as they come for a 5X7 component.
ZR-650 are 6-1/2" with 1" aluminum tweeters and they are more accurate then the C5 set. The highs are much brighter and crisp and don't roll off on the highs like a silk tweeter.
Both sound great but if you want a more accurate precise sound go ZR.
Today I have Dynaudio components in my doors. Still have my ZR-650 speakers they are keepers for sure. Will use them again somewhere

JL makes nice drivers.......