MT121 revisited, revised |
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pfly
Old Croc Joined: 25 October 2007 Location: Helsinki, Fin Status: Offline Points: 2828 |
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Posted: 14 March 2011 at 2:23am |
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 |
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mikey bear
Old Croc Joined: 29 October 2007 Status: Offline Points: 2379 |
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cracking work! much appreciated
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Aztor
Registered User Joined: 22 September 2010 Location: Norway Status: Offline Points: 381 |
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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 |
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t.geessounds
Young Croc Joined: 10 May 2010 Location: US... New york Status: Offline Points: 908 |
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am tryin to open the file but it dont want to open???
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pfly
Old Croc Joined: 25 October 2007 Location: Helsinki, Fin Status: Offline Points: 2828 |
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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. |
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MarjanM
Old Croc Joined: 10 February 2005 Location: Macedonia Status: Offline Points: 7816 |
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You need to have Sketchup installed to be able to open it.
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Marjan Milosevic
MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
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graftak
Registered User Joined: 01 February 2011 Location: Netherlands Status: Offline Points: 39 |
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Do you have The Hr data for this with the altered rear chamber and front chamber..
Cheers, Graftak
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pfly
Old Croc Joined: 25 October 2007 Location: Helsinki, Fin Status: Offline Points: 2828 |
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To be honest the differences are so small that HR can't show anything relevant. Difference in back chamber size is about the same as choosing between ferrite and nd magnet.
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graftak
Registered User Joined: 01 February 2011 Location: Netherlands Status: Offline Points: 39 |
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thanx for your reply, ( and i could always put a little piece of extra wood in the chamber...)
anyway bloody nice job making the cab eazier to build. Cheers, Graftak
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graftak
Registered User Joined: 01 February 2011 Location: Netherlands Status: Offline Points: 39 |
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is there any chance you could save this as an Sketchup 7 file.
Cant find a free version of sketchup8.. Cheers
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djeddie
Old Croc Joined: 26 April 2004 Location: Bristol Status: Offline Points: 4125 |
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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. |
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Chas n Dave : it's like Drum and Bass but with beards. E=mc² ±3dB
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Tibor23
Registered User Joined: 02 September 2010 Location: Holland Status: Offline Points: 62 |
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Thanks man, greta job. this is realy usefull:D
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S.O.K.
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