A few good videos, including this one, at Suncoast Audio on the Diablo 300.
https://www.youtube.com/watch?v=oeQXNimsvqk
And here's the website for Suncoast
https://suncoastaudio.com/product/diablo-300/
https://www.youtube.com/watch?v=oeQXNimsvqk
And here's the website for Suncoast
https://suncoastaudio.com/product/diablo-300/