Hello,
i'm going to start with a new diy project. This time i would like to try to build a transmission line. I already searched a lot and i visited martin king's site about TL's, but i still don't understand how to design a TL properly.
Could somebody tell me how to design a Transmission Line?
regards
i'm going to start with a new diy project. This time i would like to try to build a transmission line. I already searched a lot and i visited martin king's site about TL's, but i still don't understand how to design a TL properly.
Could somebody tell me how to design a Transmission Line?
regards
The first thing I do is pick out a speaker or speakers that I would like to be in a TL. I then get the T/S parameters for it. With the FS parameter I then apply this formula to find out how long the pipe is going to be;
(1128/Fs)/4 = 1/4 wave in feet
Feet x 12 = length in inchs.
Let's say the driver has an FS of 40 hz.
1128/40 = 28 28/4 = 7 x12 = 84.6 inches
I then apply this to MJK's worksheet and start entering the numbers.
I massage the numbers until I match the speaker (red line) with the infinite baffle (blue line)...
I then get some chart paper and design the box.
My latest creation;
http://img.photobucket.com/albums/v641/rjakubin/My_Labyrinth.jpg
and the front;
http://img.photobucket.com/albums/v641/rjakubin/DaytonClassic5sSeasH1212.jpg
I haven't charted the frequency response so I can post it yet, but they sound great. Unbelievable bass out of the 2 - 5 " Dayton Classics;
http://www.partsexpress.com/pe/pshowdetl.cfm?&DID=7&Partnumber=295-300
They sounded so good I removed the 3/4 " Dayton Neo's and gave them a Seas tweeter (H1212) and crossed them over at 1400 hz.
(1128/Fs)/4 = 1/4 wave in feet
Feet x 12 = length in inchs.
Let's say the driver has an FS of 40 hz.
1128/40 = 28 28/4 = 7 x12 = 84.6 inches
I then apply this to MJK's worksheet and start entering the numbers.
I massage the numbers until I match the speaker (red line) with the infinite baffle (blue line)...
I then get some chart paper and design the box.
My latest creation;
http://img.photobucket.com/albums/v641/rjakubin/My_Labyrinth.jpg
and the front;
http://img.photobucket.com/albums/v641/rjakubin/DaytonClassic5sSeasH1212.jpg
I haven't charted the frequency response so I can post it yet, but they sound great. Unbelievable bass out of the 2 - 5 " Dayton Classics;
http://www.partsexpress.com/pe/pshowdetl.cfm?&DID=7&Partnumber=295-300
They sounded so good I removed the 3/4 " Dayton Neo's and gave them a Seas tweeter (H1212) and crossed them over at 1400 hz.
thanks, i also tried to use MJK's worksheet, but i don't know how to use it. The graphs are colored red, so there's probably an error or something: qtd can't be measured because it isn't possible to divide by 0 [qed], while qed is 0.44
but even if i change the numbers, there are still no graphs...
but even if i change the numbers, there are still no graphs...
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