If you read my earlier blog, I did buy a few tweeters from US which according to the review is good and cheap. I did not have change to test them until recently. I run a simple test to verify which tweeter have better performance.
The tweeter on the Bottom-left is the current tweeter I use in my BH. Can't remember what is the brand. Is made in China. The tweeter on the Top-Left is tweeter from Orian KP307M bought in Jakarta. The tweeter on the Bottom-right is tweeter bought from US (GT-1025) and the tweeter on the Top-right is tweeter bought from US (GT-1005).
Orion KP307M, Tweeter bought in Jakarta.
I opened out all the tweeter and checked the inside. The tweeter that I use has coil (copper) below the diaphragm.
The tweeters that bought from US and Jakarta do not have coil.
I not very sure the use of coil. When I compare the sound played by those tweeters, the tweeter with coil can play louder. After checked the tweeters, I start run the sound test. I used Sony digital Recorder to record the same sound from the Amplifier at the same distance. I used wool to cover my recorder mic to reduce the wind sound.
After recorded, I try to listen the sound quality from each tweeter. Maybe my listening skill is not good enough, all the tweeters almost same quality except the tweeter that I use the pitch seem to be higher. You can here the sound by click the link below
I then used Audacity software to analyse the frequency response of each tweeter. Good Tweeter will able to reproduce the same frequency waveform as compare to the original sound below.