As the owner of three large parrots I know that birds really like loud noises to fit in with the flock(you) The more noise you make the noisier they get. I have an Amazon,an African Grey,and a macaw.They love the vacuum cleaner running in their room.They get up close to it and scream their heads off.That is the reason your birdies are chirpy,they just want to fit in.
Peace
Lounatik