Herge,I went to the Bose web site and found the specs for your system. It shows 500 watt draw at either 50/60 Hz 120V (US)or 50/60Hz 230V (Eur). A single 20 amp outlet will be all you will need for power. Be sure to use a heavy enough extension cord (minimum 12gauge wire) from the generator to your system. The specs showed a 32amp maximum inrush current. This will be only momentary when you switch on so you dont want to lose ampacity with too small or too long an extension cord.
If any other power using device is on the same circuit make sure it is off when you switch on. BTW the above specs are on page 21 of your user manual.

How do you like the Bose system? Everything I've read about them point to an awesome PA system.

rr