I have just ordered the Klipsch RP-8000F and the RP-600C upgrades from GR Research. Before I orders I called in and had to leave a message. It wasn't even 1 hour later, he called me back and answered all my questions. I am very excited to go through this Upgrade process and make these budget speakers come alive. My order will have to wait for the tube connectors to come in and then it will be shipped out. I will try and document as much as I can during the upgrade. Maybe a YouTube Video too.
For now its time to keep listening to my music and making more notes about what I hear and then after the upgrade do it again with those same songs. I am hoping for more detail and a full body in the midrange. We will see????