In search of a directional speaker

Factual Questions
1

I am trying to find a directional speaker for a museum exhibit to play a short but annoying (especially upon repeated listening) piece of music. The speaker would be ceiling mounted directly above the listener.

This is just what I am looking for, but seems rather expensive, judging from a used speaker currently going for $900 on ebay. Our budget is probably in the $200-300 range: what might we do for that amount of money?

2

This is still out of your price range, though there have to be other parabolic speakers out there. For that matter, you might get lucky by putting a speaker at the far end of a long tube.

The floor will also have to be carpeted under the speaker to keep reflected sound. from filling the room.

3

Soundtube is another company that makes these. The cheapest is the FP6020 which googling will turn up in the 400 buck range.