WOW! This system is so loud and under $20 you can't go wrong. I started the pump. "not connected to horn" and it was using a lot of amp so I put a few drops of oil on the input side. This seemed to allow the pump to run at higher RPMs and faster. Can solve the pump issues some of the reviews are talking about. Might help him last longer too, we'll see. I think a small foam filter (chainsaw air filter) glued in place would be a good idea for any air pump. For less than $20 I can get a few more. We could try setting up a cell phone to answer protesters' questions about the megaphone.
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