SEAS DXT Tweeter

[Pete Basel]

I see that there's a lot of interest in the SEAS DXT tweeter and this page came up in a search from 2008:

Seas DXT Tweeter

I'm interested in the effect of the mods but would not plan to do them other than to fill the screw holes.

AI tells me that there's no technical paper on the design other than:

• The core principles for this Finite Element Analysis (FEA) waveguide design are detailed in a Norwegian university Master's Thesis on Waveguide Design.

AI also points to these measurements: https://heissmann-acoustics.de/en/test-seas-dxt-27tbcd-g/

More: https://www.audioexcite.com/?page_id=2242

While constant directivity (CD) is mentioned, it is good to only about 3 KHz, not bad for such a small guide.

SEAS data sheet: https://www.seas.no/images/stories/prestige/pdfdatasheet/H1499_27TBCD_GB-DXT_Datasheet.pdf

It is out of stock in the US and I'm wondering if anyone has made a 3D print of the faceplate. It would be interesting to have the option for the Dayton RST28, and the low cost SB tweeters.
Also, does this design have an advantage over a simple, small waveguide - is it smaller for comparable CD control?

 

[Pete Basel]

The Norwegian university Master's Thesis you are referring to was written by Jonas Grønlund in 2011. [1, 2]
His graduate research focused on designing and analyzing the wide dispersion waveguides for SEAS—the acoustic lens and phase-plug technology utilized in the SEAS DXT (Diffraction eXpansion Technology) tweeters. [1, 2, 3, 4]

• • Author: Jonas Grønlund
  • University: Norwegian University of Science and Technology (NTNU), Trondheim
  • Department: Department of Electronics and Telecommunication
  • Thesis Title: "A Method of Designing Wide Dispersion Waveguides Using Finite Element Analysis"

AI provides a dead link to the paper, anyone have it?

 

[benchmarkmannen]

@Pete Basel : Use Wayback Machine (paste https://core.ac.uk/download/pdf/30805848.pdf in its search field), then find a date where the file exists and download the file.
I just successfully did this (using 12 June, 2024), press 'open' on this to download the pdf.

 

[Pete Basel]

Thanks very much, I did try it before posting and it didn't work for me. Got it with your link.