Yes, it was the PA3X. I don't know if it is the same as the 900. Uncle Dave will know.

As for the MAXX settings, I did play around with them a lot, but I pretty much leave it the way they are now, with occasional slight adjustments for extreme rooms, such as a room with a lot of glass, or the other extreme, a lot of carpet and wall covers.

On the E.Q. section, everything is flat except for a slight boost about 7k. On the audio section, I have boosted bass, treble, and stereo all about halfway up. I have boosted volume to 75%. The PA3X seems come with a reduced volume level out of the box, and boosting this setting brings it up to a more normal level of "hotness".
Hope this helps.