I just went thru both the Treo and and Quattro manuals.
the setup differs only in the setting up of the low frequency equalization/ level set of the built in subwoofer in the Quattro. The Quattro would do better w 22 wpc as they have a built in amp for bass that takes a tremendous load off your main amp HOWEVER!!!!! You must use the Vandersteen hi pass filters between your amp and preamp sections - sometimes impossible with an integrated, sometimes not.
you have at least three fantastic So Cal Vandersteen dealers between San Diego and Santa Monica
from my experience having bought gear from 2 out of 3 they will all welcome bringing your amp for a demo.
they all display the Treo. two have the 7 so you can hear how close they come.
my Winter place in Carlsbad. Any way I can help you I will
GDNR yes, lucky bastard....