The sms lets one attach the left and right out puts of your fronts from the pre/pro (990 in my case) to the sms, the out put to your amp with a built in 80hz crossover. Not a bad feature if you ask me.

Question, do you loose the lfe of the dedicated sub out line if you connect this fashion. Is the sub out line from the 990 which you would usually connect to the sms the only place where the LFE reside or are they duplicated in the main left right out.

thanks