Hey much appreciated. No need for your PB10-NSD's to feel insufficient. I know as I use to own one myself. Two would have really kicked some serious butt. I must say that the Grammas are honestly making a significant difference. One way to describe it would be for me to say the bass sounds much cleaner. It seems to sound a bit tighter and punchier as well. Not much, if any, overhang at all. I am convinced that the best place to put my Pluses is right behind my love-seat. If, any of you Outlaw owners are thinking about getting a Gramma or even a SubDude be sure to do it. It will be worth your time and money. I am so glad I did.