Here's a link that has a video of various Honda generators with the db levels so you can hear them at low power levels and full power levels.
http://www.hondapowerequipment.com/products/models.aspx?page=models§ion=P2GG&category=sq
Click on Generator sound level comparison in the lower left gray box
http://www.hondapowerequipment.com/products/models.aspx?page=models§ion=P2GG&category=sq
Click on Generator sound level comparison in the lower left gray box