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Simplified MT121 Plans
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levyte357 View Drop Down
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    Posted: 16 April 2008 at 10:44pm
For those of us who weren't aware they were here.

Originally posted by Three-Bee Three-Bee wrote:




img218/8403/tdamt121gk5.jpg


Originally posted by TDA-Audio TDA-Audio wrote:

mt121 my version








Edited by levyte357 - 16 April 2008 at 11:02pm
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Well done lev, it took me a while to find that plan when i was looking for it the other day actually.
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Where did it go three-bee?
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levyte357 View Drop Down
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Next question.
 
Can someone put up hornresp data for this? 
 
Plans say it will go upto 1.6khz, but I'm sure its starts falling off sharply at approx 900hz.
 
My initial guestimations,
 
Horn length=47.8cm, Vrc = approx 11 litres,  S1=360 sqcm,  S2=1911cm2.
 
 
 
 
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Mark James View Drop Down
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horn response wont model well after about 400hz iirc. 800hz seems to be the usual crossover point according to users. maybey the mods would make it play heigher??? I doubt it that much though to be honest.
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levyte357 View Drop Down
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Originally posted by Markk James Markk James wrote:

horn response wont model well after about 400hz iirc. 800hz seems to be the usual crossover point according to users. maybey the mods would make it play heigher??? I doubt it that much though to be honest.
 
OK.. Just what I was thinking...
 
Gonna be a bit cheeky here Wink, and ask peeps to estimate what size chamber, throat, horn length would be needed for 15" straight horn to fit below MT121 section in same cab?
 
The 15" section would ideally handle 90-160.
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Mark James View Drop Down
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could maybey extend the selenium horns from the pas series??? they only do 120hz though...
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levyte357 View Drop Down
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Originally posted by Markk James Markk James wrote:

could maybey extend the selenium horns from the pas series??? they only do 120hz though...
 
No pulling the wool over your eyes mate, thats exactly what and why I'm asking!!!!
 
The Selenium plan alledges 120-300hz, I guess it would require larger chamber/throat and longer horn to drop top 80hz. 


Edited by levyte357 - 28 April 2008 at 2:55pm
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Mark James View Drop Down
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I cant see why what your asking cant be done, might end up a bit bigger than youd have hoped for but I cant see any reason it couldnt be done lol.
markk
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why not start from scratch?
 
you have moved away from the original design anyway
Produce a killer sound. Take no prisoners.
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levyte357 View Drop Down
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Originally posted by Heathrow_B_line Heathrow_B_line wrote:

why not start from scratch?
 
you have moved away from the original design anyway


Yes, but I guess it will stil be compromise on the 15" section; 25cm deep rear chamber + 60cm horn, and we are already talking cab depth over 80cm. 

If I knew exactly how to sim the Selenium 15+12 trap, it would be much easier design from there.
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TDA-Audio View Drop Down
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\\\\\\\The 15" section would ideally handle 90-160.\\\\\\\

yez (60-80 -- 140-160)

\\\\Selenium 15\\\\\\

no - not work 60-80 hz...
smoll mouth. and short  horn...

hd-15  may be...
horns plans http://photofile.ru/users/tda-audio/
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