Birdcall sound is a must for any new Birdhouse (BH). The moment your sound system fails or not functioning to the required specification, your BH is bound to fail.
I have seen many BHs which used to have streams of birds entering the house and when the sound system fail to operate, the birds were no longer there.
Sound failure might be due to a few reasons but more often then not is due to no electrical supply because the owner have lost interest in the house. I have seen this in Port Klang and Kuala Selangor recently.
The lesson we learn from these events is that you must ensure that your sound system are running perfectly all the time.
For a BH to be successful you need to plan to choose the right type of sound system which comprise of the sound medium (CD or thumbdrive), the sound players, the amplifiers, the tweeters, the type of wires, timers, and the best method of installation.
What you need is a resonably good system that will produce a high quality sound to entice those wild birds to enter your BH and to feel that you BH is full of other birds with lots of babies crying for food.
To do this I would like to focus on the various types of tweeters that I feel essential to a new BH.
To me every BH must have a minimum of three sets of bird call tweeters.
1) First set is the external call tweeters. These tweeters must have the ability to travel at least 500 meters away from the tweeters towards the flight path of those wild birds. There are many choices available in the market. Some can reach a range of 1,000 meters.
2) Second is a set of tweeters that you use to lure the birds into the house the moment they enter the entrance hole into your tunnel and into the roving cum nesting areas.
3) Third are those tweeters that you use to mimic baby birds chips plus those love making sound that you placed on the nesting planks. These set of tweeters should be properly install and I do recommend that each tweeter be wrap with mesh wires for those birds to cling to.
Some BH that I visited put in additional tweeters outside the house, mount on a pole just next to the entrance hole. They looks likes an arrays of cone tweeters that have the ability to provide a 360* birdcall sound area. The are ussually term as Hexagon Tweeters.
I am not an expert in these sound equipment but from what I have learned and experienced, one of the most important criteria in choosing these tweeters is to ensure that they will provide a crystal clear sound mimicing the birds that will attract them into your BH.
There are two types that are very common. The Piezo and Magnet. Piezo are much lighter while the magnet are heavy and larger in size. Both are acceptable but for your nesting plank area I recommend the use of piezo while those area where you draw the bird into the BH you use the magnet typer.
For your external call you have to be carefull in selecting the right type since you might expose the tweeters to the hot sun and those heavy rains.
These are some pictures that I have download for your view and further investigation.
Double Horn tweeter using piezo type drive (external and tunnel)
A set of Piezo Internal Tweeters (good for your nesting rooms)
Magnet Square tweeter (suitable for tunnel and external sound)
Magnet square tweeter (for tunnel, external and nesting rooms)
Piezo Internal Tweeter (lightweight for your nesting area)
Bullet Horn Tweeter (suitable for your tunnel and external).
Double Horn Tweeter with grating ( suitable for external sound and tunnel)
Medium Range External Tweeter ( 500 meter's range)
Long Range External Tweeter (1,000 meter's range)
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