There are times when I would like double bass. I know that might sound crazy to some but, since the bass channel is mono and low frequency it has never bothered be to have more than what may be considered appropriate. With the 950 even if you had 20 to 20K speakers they would only get 40Hz at the lowest. Although rare, there where times when I wanted more bass from the system, which I new was there, and could not get it out of the 950. There have been a few occasions where I was playing a cd and noticed no output from the subs, when I switched to 5 channel stereo, the subs would start working. Just was hoping the 990 would provide more control over this.