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13) Use the 4 meters by 4 meters room size rule.
Most people do not take any notice of this 4 meters by 4 meters rule.
The birds when turning need enough space to turn. If those rooms are too small they have difficulties to maneuver and might hit the walls.
Once they hit the walls they will hurt themselves and normally will die. In the wild you cannot effort to be sick or injured.
So when you design your BH make sure the 4 meters by 4 meters rule is adhered to all the time unless not possible.
14) The size of your BH main entrance hole.
The entrance size do play a major role in enticing those birds to enter your new BH.
When designing the entrance hole you need to allow not only three birds to enter at one time but you need additional room for those tweeters.
If you placed two tweeter, one each at the sides, the space taken will make the hole very small.
Too big will land you with to much air flow and to much light.
My recommendation is to use the 2.5 feet wide and 3 feet long. This should be the minimum size.
15) External Sound Playing time.
How long should the external sound to be played?
I came to the conclusion that you need to start the external sound as early as the dawn breaks and you may want to add one to one and the half hour after sundown to shut it off.
In Peninsular Malaysia you should start somewhere at around 6.45 am and shut at about 8.30pm.
It seem that there are always late comers who happened to know that in the last hour of sunlight there are lots of insects in the air.
16) Be precise on what sound to play at what time of the day.
This is something that I discovered. If you wanted to extend the effectiveness of your precious sound, you need to use them only at the peak time.
What is a peak time? Well the answer is just observe the crowd at the entrance hole and you will get the answer.
All that you need is to schedule the sound to be played at those peak hours and the rest of the time play other sounds that you consider as pretty good but not as powerful as the main sound.
17) All Sounds Must Be Profiled and lengthen to 1 hour duration.
To ensure a smooth transition from one sound to the other you need to profile all sounds that you collected and keep in your sound library.
If you profile them, using suitable software, you can assured yourself that every time you change those sounds there is no sudden volume variation at those tweeters.
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