I just put four of them in my Focus S. They fit easily and the volume is about the same as the OE speakers. I like Infinity because the mids and highs are very clear. I have Infinity in my 2008 Taurus and my home system. I think the bass is good for 6-1/2" speakers and for the music I listen to--classical, jazz, and rock. The bass is very tight and controlled compared to the OE speakers, which I thought were very boomy.
(I just noticed that you already installed them.)