you have learned the hard way about system matching
did you listen to the combo or did you order everything and are now listening to the system
the nad m33 is an excellent amplifier but it is too clean for the sopras you need a warmer amplifier
you have two options
1 sell the m33 and move into a warmer integrated amplifier
We are a focal dealer the Unision research unico 150 sounds amazing with them
or keep the M33 and use it as a streamer/preamp and use a warmer power amp
dave and Troy
audio intellect NJ
Focal, nad, unison dealer