I just got a 970 it wont turn on my BW asw 650 subwoofer. I just replace my adcom gtp600 with this unit so I know my sub is connected properly it always powered up when unit was turned on. The sub doesn't have a trigger input. I switch the bass management switch to all spots no help. Is this a setup problem speakers are set to small crossover is set to 80HZ any help would be great.