I emailed NAD a few days ago, but unlike Polk who returns your emails within 24 hours, NAD has yet to respond. My question was, is the sub-out on the 763 filtered or unfiltered? I didn't see it in the manual either. Does anyone know the answer? Thank you in advance.
I don't know the answer to your question but I also own an NAD receiver and have had the need to contact their support. They always answered my queries within a few days. My guess is you'll receive a reply soon. Good luck.