Bazooka is used to shoot external sound to as far as 1km. So that birds can be attracted from far. But did anyone verify the bazooka really can shoot so far? Is the sound still good and clear? I did check in Wikipedia about "Horn Loudspeaker".
http://en.wikipedia.org/wiki/Horn_loudspeaker
According to the Wikipedia definition, horn can be divided into throat and mouth. Throat is the narrow part right after the horn driver and mouth is the external diameter of horn. Normally is exponential shape. But non of the current Bazooka in the market have this criteria. Either the throat diameter is too big or the horn shape is cone or cylinder shape by using PVC pipe. I really wonder whether those bazooka can perform as what they claim.
Recently, I found a website in US that sell good bullet horn driver which is likes CTS quality that can deliver 100 watt RMS power and can go together with 10" exponential horn. Since I am going to US next week, I planning to buy some back to try. For those who interested, please let me know.
* Similar to KSN1142A * Power handling: 100 watts RMS. * Frequency response: 1800-30000 Hz * SPL: 92 dB 1W/1m * Mounts to any 1-3/8", 18TPI horn * Dimensions: diameter: 2-7/16", depth: 1-1/2".
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