I can connect my celestion S8 sub via the LFE on my amp or L&R speaker outputs. However my sub has an active cross over only down to 80HZ!!! (From a sat combi) My amp cuts of the crossover to the sub on the LFE at 90hz, so my floor standers play all the notes higher. However if i connect the sub via the L&R outputs, the sub plays from 80HZ downwards and the fronts play down to their 50hz. There will be an overlap from 80hz to 50hz, but will this matter. Plus do i connect the L&R outputs from my amp into the low or high input?