Hi nicksync.
I own a Companion 2 since a few months. Describing noise is always a bit tricky so i hope my answer will help you.
If the library is completely quiet, nobody talks, not many people woalk around, the answer would most likely be yes. The fan is fairly loud for a device this size and the fans are necessary because the companion 2 produces a relatively high amount of heat.
If there are some people talking, walking around, ... it would be ok as long as you donΒ΄t do very complex things that lead to more heat. If the fans are on max it would definitely annoy people.
Hope this is useful to you!