Don't do Infinity 6.5s unless you listen to them first. I've owned the latest generation of Infinity Kappa and the MMD tweeters are harsh enough to release the hounds from the pits of hell! They weren't bad off of Head Unit power when I lied to myself by saying I wouldn't do another system but when they received 100 watts RMS, the tweeter managed to outbright the dang mid:verymad: