Tweeter Testing - part 1

Of late I have been reading what people in swiftlet farming community said about tweeter performance & tests. At best are some comparative tests using a certain bird sound played over a few tweeters, record the sound and use software to plot its frequency spectrum. Some published test charts but could not even explain them properly. These are not proper tests which shall be evident later.

There is a lack of discussions on how tweeter should be tested.

The coming weeks I will be testing a series of tweeters. In the process I'll work on a DIY kit so you can perform tests on your tweeters too.

To begin with, the sound source should be a pure sine wave of constant amplitude (volume). It's frequency changes gradually over the test range. I've found a video clip to illustrate this. The sweep frequencies are from 20Hz to 20KHz. The waves are of constant amplitude throughout; however it does not appear so at higher frequencies. You will see the amplitude fade off at some stage and later wave patterns develop due to sampling effects. This is because the computer display is not fast enough to cope. Only an instrument like an oscilloscope will show it properly. It is the same when I played my test signals on the Windows media player.