[Jedi Padawan]

In order to hook up a siren or horn powerful enough it would have to have a hookup to the main system and that would end up making the "decoration" "functional" and so it wouldn't be allowed. But unless your planning on reaching over the field and sticking it right behind the operator stand chances are your opponents (or the audience) won't be able to hear it. I've been to about 4 regionals and at least that many non-official events (between scrimages and stuff like lego tournaments (trust me after having that many kids scream you lose hearing just as well)) That I know for a fact when it was stated that there would be seismic consequences for a siren that loud that it is true.