This is our fairly quiet Honda generator. The generator is not as good as 'real' electricity, but still, not bad. Sound is VERY acceptable and the Honda stays quiet enough to hear well at lower dB levels. Runs 8-9 hours on one tank of gasoline.
Outdoor audio presents many unique challenges.
Modern electronics can perform miracles but acoustics depend upon space - the space your event occurs in. Adding in people complicates matters as each body in or out of the 'space' changes the overall effect and sound. It's subtle, but it's there. They have that special something that you never quite can put a finger on but audio really happens. Nothing compares to a fine performance delivered via a fine sound reinforcement system run by fine engineers in such a space.