Further Improvement

Last week two improvements were made:

On April 31st, my partner wanted to add a partition to facilitate the birds flying into second floor.
Two days after the change there is no adverse effect on the rate of incoming birds. They still came around the house three rounds a day, morning, noon and one o'clock. The problem was the amount of birds outside the house, in front of the entry hole were so plenty, but only less than 10% flew inside the house, and even worse, less than 10% flew into nesting room!
On the third day after the change, the noon and afternoon birds were disappeared and they came around 6.00-6.30 pm instead. Same symptom, plenty on the outside, very few inside!

So on May 4th, my partner went in again to increase two more tweeters inside the nesting room facing to the nesting entry hole. My observation was once birds were inside the house, they flew into the nesting room more smoothly, less flocking outside of the entrance hole.

This video showed that they flew into the nesting room faster than before with the help of two more tweeters inside.



On May7th, my partner went to installed three more tweeters on the roving room to help pull down the birds. But I guessed they weren't effective enough, the same problem of very few birds fly inside the house is still there. The majority of birds were circling inside the BH behind the entry hole a few seconds and then flew out. What a heartache!
Watch this video to see what I meant.