i expect the effect of any resonance resulting from your set up would probably be imperceptable. that said, i would still err on the side of caution (or, would that be retentitiveness?) and not set the integrated atop the d/a converter. if you've got the time, why not experiment and see if you can hear any difference?
Vibration/Resonance
I am in the process of moving some equipment and was concerned about putting my integrated (NAD 317) on top of my D/A converter (Wadia 32). Are there any issues with resonance from the integrated or am I being over cautious? I want to take this opportunity to wish everyone a happy New Year...and thank everyone for your advice. I really enjoy reading the threads and learning about hifi. Thanks.