In the first article about the original Kalrson tube, I was able to develop the BEM models and investigate the acoustic properties of this special type of horn/waveguide. I made no secret of the fact that I particularly disliked the directivity control. A few days ago, I had an exciting idea about how to modify the Karlson tube to achieve better results. The implementation wasn’t that complicated, and in the end I was quite surprised at how good the results were.

However, I will not reveal exactly what has been changed. Nevertheless, here is a view of the new model:

DrBA K-Tube BEM model.

This special Karlson tube was designed for a 2-inch driver, and the overall length is about 29cm. Here are the results:

DrBA K-Tube tube radiation impedance.

DrBA K-Tube tube hrz polar.

DrBA K-Tube tube vrt polar.

I will call this DrBA K-Tube (a Karlson tube inspired design). A major improvement compared to the original design. Anyway, the acoustic loading characteristics remain limited in comparison to a horn of similar length. Maybe I will try to design a longer DrBA K-Tube in the future for better loading.