I recently purchased this mini siren off of ebay, and it is has a pretty good sound output but there is one problem, all of the sound output seems to be directed out of the front of the siren, even though the ports are on the side and exposed & you easily feel the air blowing out of them. If I try to force more air into the front of the siren it actually seems to bog down, unlike my hand siren which gets louder when it has "forced induction". Does anybody have any idea why it is doing this? Is the rotor design?