Use of a super tweeter worth the investement ?

There are two types of super tweeter implementations.

1. In audible spectrum from 11-13KHz

2. Ultrasound 20KHz and up.

I don't have experience with Ultrasound implementation. But people say it works.

The first one is needed when speakers are not extended on top (like some vintage and full-range speakers). And it works and improves sound a lot. Makes sound more refined, improves soundstage and adds air. I did 1st order and 4th order crossovers for my Fostex T90a super tweeters and 4th order is superior by far. 1st order adds distortions to the upper midrange that makes sound harsh. No wonder such famous companies like Tannoy, Harbeth, JBL do 3rd order crossovers for super tweeters. 

That's interesting information Alex.

@alexberger, +1

chorus, I will give them a try soon, and I let you know for sure, thank you .

roxy54, do you have to search before finding the right placement on top of your main speaker, do you have to move them more in front or back or in line of your main speaker tweeter ?