Mellow Monsters

[maloner]

Does anyone have detailed plans for building either the MM8 or MM12 speaker cabinets all old threads have missing plans and photos.

 

[freddi]

start on page 47 http://www.americanradiohistory.com/Archive-Poptronics/60s/62/Pop-1962-10.pdf

I talked to a guy about 50 years ago who built one - would be a fun project and nice HF Olson tribute---

 

[freddi]

those scans, while not so great, are readable - you should be able to go through the article and illustrations to make a plan. I'd love to hear this horn - maybe with FE206EN

planet10 made a nice drawing - its in "this" thread http://www.audiocircle.com/index.php?topic=105900.0

here are the main images from the article

MM8 Popular Electronics, October 1962

 

[EricAuer]

Very cool design, I wonder if it scales well. A 5" driver in a downscaled version could be interesting.

Eric

 

[freddi]

its derived directly from Harry F. Olson's 1937 compound horn patent

https://www.google.com/patents/US2224919

for a smaller speaker, it would have to retain enough 1/4 wave path length to function -- some of the idea might be retained. Only so much can be done in a given bulk.

 

[freddi]

The Internet Archive has what I assume are the original resolution scans

https://ia802705.us.archive.org/Boo...-10_jp2/Pop-1962-10_0044.jp2&scale=2&rotate=0

https://ia802705.us.archive.org/Boo...-10_jp2/Pop-1962-10_0045.jp2&scale=2&rotate=0

https://ia802705.us.archive.org/Boo...-10_jp2/Pop-1962-10_0046.jp2&scale=2&rotate=0

https://ia802705.us.archive.org/Boo...-10_jp2/Pop-1962-10_0047.jp2&scale=2&rotate=0

 

[GM]

Cool! Had totally forgotten about these. I'd wanted to build one, but events led me to DIYing a pair of Altec A7 cabs instead. I'm guessing the BOFU's or Betsy-K's specs would be close enough.

Do you still have RCAfan's build, measurement pics of his clone of the original?

GM