Tag Archives: mk3b2

++ Announcement (23.09.2025) ++ Revoke of permission for the free use of my Calculators and Designs and IP

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Unfortunately, I no longer see any way to continue making my intellectual property available free of charge. After more than five years of giving so much to the community, my own benefit is not even close to zero, but far into the negative.

For this reason, I hereby revoke permission for the free use of all spreadsheet horn calculators and designs provided by me anywhere and, overall, the use of my intellectual property with immediate effect as of 23.09.2025!

For those who have already downloaded my calculators in the past (there have been thousands of downloads already!), I expect at least that you make a donation if you want to continue using them to support my work and to keep this blog alive. Otherwise, please delete all the corresponding files that are related to my intellectual property. Keeping any copies is not permitted. Please contact me by email if you would like to continue using my work to discuss conditions.

If you would like to use my calculators and designs in the future to build your own horns, please feel free to contact me by email. A license must now be purchased in order to manufacture any horn loudspeakers based on my intellectual property. In this case, please contact me by email and just shortly describe your project, and we can discuss conditions.

If you have already built any horn speakers based on my work, I would really appreciate it if you consider making a donation. Please also contact me by email in this case.

If you simply enjoy reading my blog and would like to support my work, please consider supporting me with a donation by contacting me via email to discuss the details.

Any commercial use of my intellectual property for the software, results, designs, CAD files, or documentation provided here remain strictly prohibited! But I am open for discussion about special conditions.

The First Build of the mk3b2 Radial Fin Horn

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Much faster than I initially thought when writing the original article and providing the corresponding sample CAD files, my mk3b2 radial fin horn was already built using my  sample CAD files intended to use for a high-end 2-way speaker project. Of course, I feel  honored when someone trusts that the theoretical investigations will prove useful in practice and invests a lot of time and financial investment in such a project. The genesis of the entire speaker project has already been documented and discussed here:

https://www.diyaudio.com/community/threads/2-way-horn-system-based-on-the-mk3b2.400627/

I was thankfully given permission by the owner of the new speaker system to use his own photos to write an article about the build of the speaker. But I’m essentially limiting my focus to the phase of building the mk3b2 fin horn. I would like to take the interested reader on a little mk3b2 picture journey.

Milling the parts…

The side flare elements are separate parts.

Everything complete to start assembling?

The fins as close-up.

Glueing the radial base element layers.

Glueing the side elements to the radial base elements.

A step that needs high attention and accuracy is to align the fins. Great idea!

Painting and glueing the fins and radial base elements before assembling the whole horn.

Painting and assembling of the horn.

mk3b2 fin horn.

mk3b2 fin horn.

mk3b2 fin horn.

Horn adapter glueing the layers around the 3D printed inlay. I like this idea!

Finished horn adapter.

mk3b2 in action.

mk3b2 in action.

mk3b2 with front loaded bass reflex unit.

mk3b2 with front loaded bass reflex unit.

mk3b2 with front loaded bass reflex unit.

high end 2-way speaker system.

high end 2-way speaker system.

What a beautiful and awesome speaker system! I would like to congratulate the designers and builders on this great speaker project.

A personal comment from my side about the mk3b2 fin horn based on the previous simulations and the initial sound descriptions. I am convinced that from now on the quite well known fin horns like TH4001 and Yuichi are obsolete. They neither load sufficiently being way too short to be able to load down to their designated cut-off values nor they cannot completely avoid waist banding and especially finger printing at HF. In my opinion the mk3b2 radial fin horn is the new reference.