Channels 1 and 2 show no voltage when trying to set gain with multimeter. Both channels 1&2 have output, but show no voltage. Channels 3 and 4 do. There's 2 level knobs so I set 3 and 4. Is it safe to assume that I can eyeball it or will it be way off. It's hard to listen for it toe because channel 1 is skar super tweeters and channel 2 are skar fsx 6.5 so neither sound good separate but sound fine together. I don't know shit is annoying me, don't wanna blow my speakers
