Hi Lynda
I am surprised you do not hear a difference to the sound by adjusting the bass woofer,mine is turned up to maximum,as it was when I had a Tyros 5 and sounds OK ,have you tried adjusting the EQ and Gain settings in the mixer section,you should definitely hear some difference by making changes there.Do not be afraid to make some changes in the mixer,it can always be reversed,it can make a lot of diference to the sound,room acoustics also affect the sound.I use the Genos sound system and find it is OK for my needs ,the room where I have my Genos is quite small,so no need for a large powerful sound system.
Best wishes
Alan