Turlu, have you considered adding a second 410 rather than a 115? That way you would have an 810 for those really big gigs and would not have to risk blowing the 115. That 410 must be something really special to handle the 300 watts of the Super Bassman easily. I love my 610 but I did get it in part to move a little extra air to compensate for the 100 watts of the 100T.