2 weeks ago I upgraded my Velodyne Ct100e to a Velodyne DD15. I was over the moon watching all the great movies again, until 30min ago when my neighbour came banging on the door while we were watching Jurassic Park Superbit japan DVD(that just arrived in the post today

) and said my system was shaking the S..t out of his house and said he couldnt put up with it anymore!. So what did I do? I invited him in for a movie night, obviously

, he said he'll bring the beer

. So it didnt go to badly. But I need to do something to keep the peace, and NO I'M NOT TURNING IT DOWN, because I didnt spend $25,000 on a setup to listen to it softly(BTW I always turn it down after 10:30pm). I need another fix, a cheap easy fix that dosnt involve ripping the walls apart because we are renting.
Now, both houses are solid brick construction and are about 8meters apart. When I started the setup about a year ago I used plastic and heavy fabric on the windows of the HT/lounge room and weatherstrips on the doors to try and stop the sound traveling, but now I need to stop the bass traveling.
Would those Subwoofer mats help? Is there anything I can stick on the walls to deaden the bass?
Any help appreciated, cheers