Thanks gonk, I have a 1M balanced cable arriving this week, so I'll go XLR out on the AVM to the SMS XLR LFE input. I may just then use unbalanced outs on the SMS to feed the subs. I wish they had included dual XLR outs on the SMS. (prob in the next release)

I did try to turn off the SMS Low Pass XO during one of my tuning sessions, but I got better results with it on, go figure? I'll give it another try this week after my cable arrives.