One thing that annoys me (okay, okay… one of the many things) is when people confuse “acoustic” with “acoustical”. These are not interchangeable – in the same way that “electric” is not the same as “electrical”.
An electric engineer is an engineer that runs on electricity (in other words, a robot) – in the same way that an electric train is a train that runs on electricity.
An electrical engineer is an engineer that works on things that involve electricity. For example, this is a person (who runs on food) who looks at wiring diagrams.
A person who develops loudspeakers or designs concert halls is an acoustical engineer. This is a person (who also runs on food) and works on projects involving sound and acoustics.
An acoustic engineer is an engineer that makes funny noises when struck – which is something different.
Then again, I guess if you hit any acoustical engineer hard enough, you would make that person an acoustic acoustical engineer.