Purchase of used Quatro wood ct. Looking for set up advice.

Try using the procedure in the Vandersteen manual first, p.7.
https://www.vandersteen.com//media/files/Manuals/Quatro%20CT%20Manual%202018%20copy%20030621(1).pdf

If you need additional help, consider stopping by the Vandersteen web site  forums, where you will find other owners with vast experience, and Richard steps in as well to add any additional information, input, and suggestions.

Great speakers, congrats.

You should either PM John Rutan (audioconnection) here on 
Audiogon, or call him directly.
+1 on joining the Vandersteen Forum. We'd love to see you there.
Bob