Self-EQ generates the test tone and pipes it directly to the sub output - so the sub output at least works. Manual mode generates the test tone, sends it to the EQ output, and then gets it back through the input. Do your main speakers make any noise (above the crossover point of your 970) when running the manual mode? If not, that would suggest a problem at the EQ output or with the input setup at the 970. If you do get noise from the main speakers, then the problem might be at the connection into the SMS-1.