My dad is a musician (my mum is too) and he 'discovered' the Euphonium a few years ago. Its quite loud. But then he used to play the trombone which is rather loud too. Me and my sister would get woken up in the morning by cheerful fanfares. It was very effective. One of my dads trombone colleagues once had a student who primarily used his trombone to scare small birds and insects on the island he lived on.