Hi Gary,
Again many many thanks for your help with details about your settings. It will certainly be very useful. Curiously my own seetings do not differ too much from yours. I'm also using preset #57, and both L and L/R Tyros' outputs go straight to channels 1 and 2. The global equalizer has almost the same "shape" that you use, and mic settings are not that different (I boost low freqs a little bit more, but it's difficult to compare as we utilize different mics). Interesting how you position the subwoofer relative to the tower. I just put it beside the tower, the main reason being the standard cable (that comes with the sub package) length. If the position influences the sound that much, I should then think about getting a longer cable and perform some tests...
I suspect that I have to retry the gain setting process. Although I have done it in a way that the red light never blinks - only the green (thus assuring that the gain is not too high), I notice the following curious thing happening: starting with a high volume and slightly less well balanced sound, and slowly fading out, I get better and better balanced sound (bass is better defined and overall sound improves). You use "6" as trim gain in the base unit; I'm setting it at "9" and the other gains (Tyros volume and remote control volume) are typically like yours'. Although the output signals from the PSR3000 and Tyros can be different, an hypothesis to test would be that the signal that enters the base unit is too hot... Humm...
Gary, I just printed your great message and will go through it in the next test opportunity I have. It's so great to count on your help and advice! I'll post some pics soon, too.

-- José.