Hi RL1,
I have owned both. I currently have the Cornwall IV's. Two important things. While I do agree with the person who said the the RF7's were made for electronic music, remember these are a 2-WAY speaker (or 2.5) as opposed to a 3-WAY.
So...
If you want hard hitting punch and slam, go with the RF7's. They are a blast and a great speaker.
But...
If you want a truer window into ANY recording, and a more seamless speaker, top to bottom, go with the Cornwall IV's. They are, in the end, where I put my money.
Kind regards,
Tad