MT121 revisited, revised

As many know, MT122 plans on the main site are bit misleading and confusing.

Also I think this type of midtop doesn't necessarily need 18mm outer shell, since that's just what it is, shell or rack where real acoustic pieces are bolted into.

To kill some time I redrew the horn, this time completely from 15mm ply. This thickness will be enough for outer panels and at the same time will make tricky horn assembly a bit easier with its larger joint surfaces. It should also theoretically dampen the horn a bit more. I also removed mitre angles of over 45 degrees. To do this, I needed to make the whole thing few cm taller. This makes back chamber slightly larger. Other alteration that may have slight acoustic difference to the original is that I also replaced speaker baffle and horn throat baffle with 15mm ply, so there is sliiiightly more volume in compression chamber.

I hope I got all important dimensions covered in these pictures. Missing information can be measured from Sketchup file. Please let me know if something importand cannot be derived from dimensions already given in pictures.

I also hope this will make it easier to build more MT's as I believe these are very very nice basic mid horns for the price, only put off by their build difficulty.

Here is a ZIP file with pictures with measurements and .SKP file for Sketchup
http://dl.dropbox.com/u/9726318/mt121/mt121_15mm.zip






Have fun
-Mikko


Edited by pfly - 14 March 2011 at 2:28am

Thanks. The revised version is easier.

Is it possible to create a phase plug for the MT121 ? 


Edited by Aztor - 06 May 2013 at 12:01pm

It's a ZIP file, Windows XP, Vista and 7 should be able to open them by themself, but you can also use WinZip or WinRar to open zip files.

If you mean the .skp file inside .zip, it is Google Sketchup 8 file.

Do you have The Hr data for this with the altered rear chamber and front chamber..

thanx for your reply, ( and i could always put a little piece of extra wood in the chamber...)

graftak wrote: is there any chance you could save this as an  Sketchup 7 file. Cant find a free version of sketchup8.. Cheers

Looks free to me!

You only have to pay for the "pro" version... which is bound to be on any number of 'warez' sites in the next couple of days.