My Pr is fixed and the system sounds very nice. I am having a problem with my Shiva bottoming out though. I was running a gain of +5db on my Denon 3801 but I changed this to +0Db and that did not change anything. Should I lower the sub all the way down to -12DB and turn up the amp? I am using a AVA250 from Adire BTW. This was happening at 30% power on the amp originally and now that I lowered the gain about 40% on the amp. This is only producing sound between 85-90 DB. The shiva is bottoming out at 25HZ. I did some low volume level 200HZ to 20HZ sweeps and the shiva kept up all the way down to 20hz. This was only at 65DB though. Thoughts?