I replaced the front speakers with JBL 601CF, https://www.crutchfield.com/p_109CT601C/JBL-601CF.html.
I've also ordered JBL 621F to replace the rear speakers, https://www.crutchfield.com/p_109CT601C/JBL-601CF.html.
What do you think of this Kicker amp? I'm intrigued that it has the automatic...