I am also having this problem (see my post regarding 990 recording). It seems any analog signal I send has greatly increased bass. I called Outlaw and they stated that in the stereo mode, using an analog signal, the subwoofers are fed a full range signal. I guess bass mangement is different for the analog signal. One solution is to activate the crossovers in your subs, if you have them. However the problem with that is that you now have two sets of crossovers (990 and sub) interacting. One change begets another. However, I was able to get a "useful" compromise doing this. However I am going to try something different. I have speaker level inputs on the subs. I can run speaker wire from the 990 to the sub and use the subs crossovers to pick off the bass and then send the rest of the signal via speaker wire to the mains (I have def tech bp 20's and two def tech subs). On the 990 I am going to set the fromt speakers to large. In effect the subs/main are running as one. Hopefully this way I can obtain proper equalization from both analog and digital signals. I asked outlaw if this issue was something that might be fixed in a firmware update and the response was no. It was hardware related. This is a complicated issue and hopefully I did not mistate anything regarding my conversation with Outlaw. If anyone has a different understanding of how the system works please post.