You probably tried already... Does the 770 cut out no matter what channel you connect from the 950 to the 770? For example: try connecting a different output from the 950( say the front right) to the offending channel on the 770.
It would be nice if it was just the 950 and not the amp.


M80's VP150 QS8's Earthquake SuperNova MKV-15
Integra DTR-7.4 Outlaw 755 Outlaw M200's Outlaw ICBM