Thanks, Dave
I don't have drawing software so I have to scan in pencil drawings for emailing or posting. I really like the way you made the taper from side-to-side which allows easily locating the driver at the exact center of the line's length.
Per your suggestion on the optimum number of bits and colors to use for posting modeling graphs, I'll have to investigate further with my new software to see how to change that (I'm reallllllly slow in learning new computer stuff).
Edit: You have my permission to post this cabinet drawing on your site as virtual design and you can name it anything you want.
planet10 said:
I don't have drawing software so I have to scan in pencil drawings for emailing or posting. I really like the way you made the taper from side-to-side which allows easily locating the driver at the exact center of the line's length.
Per your suggestion on the optimum number of bits and colors to use for posting modeling graphs, I'll have to investigate further with my new software to see how to change that (I'm reallllllly slow in learning new computer stuff).
Edit: You have my permission to post this cabinet drawing on your site as virtual design and you can name it anything you want.
Hey planet 10 have you done any t-lines with the Fostex drivers you modified? If so like to know your impressions. I did mini t-line with Sony 2 1/2" cube drivers. I found cleaner sound then closed box but had to cross over to sub due to increased cone excursion that were too much for the drivers. Had to put inductor on drivers to eliminate 12.5khz peak so I added tweeter.
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A few. In the case of the Fostex, the best were Mileva for the FE127eN and Demetri for FE207. Both can be pigeon holed into the subset of TLs called Mass Loaded Voigts. We haven't done any Metronomes but they are broadly similar. The diyRef ML-TLs we did weren't bad, but we'll probably end up repurposing those boxes.
dave
In an effort to shape a body of knowledge on what to watch and how to decide on a b139b enclosure, I ended up in here, staring at this drawing. It makes me wonder what is the reason behind, leaving a "blind" room before the driver? how one comes about its volume? since I have never seen the driver being positioned almost midway to the open end of the TL, I would like to hear you enlighten me a little, and possibly direct me to literature?! Is there any other reason for having positioned the baffle almost in the middle of the magnet of the driver? And lastly could you suggest a box for a TL enclosure? or should I just go for a sealed box much like a CS7? given that I have the drivers, a set of b110b and a set o t27s...as well
thank you for your time..
regards
angelo e
Not sure what you mean.
Not my design, but you do the sims, and iterate the volume until you get the response you like.
An offset helps kill some of the unwanted ripple allowing for less damping and more terminus support at the bottom end of th epassband. Well documented by Martin King.
Are you talking about the driver holey brace? This helps to tightly couple the drivers to macimize the advantages of push-push drivers.
For the B139?
dave
re
q how does one do the sims?
also, I was asking about your opinion on wich would be a nice balanced enclosure for b139 and a b110 along with a t27 or perhaps a newer one. Would it be pro 9tl or MKII or even a cs7(?) or atkinson's SOTA...this kinda speaker. I am looking for a design to "house" the drivers I have, and I have very little knowledge of the technicalities involved in the "choosing" of a design. Thank you much for the time.
q how does one do the sims?
also, I was asking about your opinion on wich would be a nice balanced enclosure for b139 and a b110 along with a t27 or perhaps a newer one. Would it be pro 9tl or MKII or even a cs7(?) or atkinson's SOTA...this kinda speaker. I am looking for a design to "house" the drivers I have, and I have very little knowledge of the technicalities involved in the "choosing" of a design. Thank you much for the time.
you mean you would go for something like this one below?
http://homepage.mac.com/tlinespeakers/FAL/box-plans/classicTL-revisited-WD.pdf
also, you mean one driver from b139 all the way to 20k or so?
which one would that be? some focals?
and I most likely would have to use two of them ? for more db pressure?
The WD one is for a specific SEAs unit not the B139. The 3 B139 ones are at the top. Pretty easy to mutate the design if none of those suit.
Yes a single driver from baffle-stap up. Top of my list would likely be Fostex FF85wk. Something along these lines but with the big TL on the bottom.
http://www.diyaudio.com/forums/full-range/144099-thread-tysen-variations-fast.html
dave
Yes a single driver from baffle-stap up. Top of my list would likely be Fostex FF85wk. Something along these lines but with the big TL on the bottom.
http://www.diyaudio.com/forums/full-range/144099-thread-tysen-variations-fast.html
dave
Thank you so much Mr Moderator Man!
I guess I asked for it! hahahaha... anyways, there is a ton of info I will have to dig into!
As it seems for now, I will try compromising drives wise and stay with the base units I have, and so choose and possibly rearrange one of those designs. The major differences with the older designs seem to be the dividors, the positioning of the driver in the path of the line...etc
As for the b110 and the t27, since I have 'em along with the crossovers, I might as well put it together for the time being.
Thank you very much for sharing all this with me.
best regards
angelo e.
I guess I asked for it! hahahaha... anyways, there is a ton of info I will have to dig into!
As it seems for now, I will try compromising drives wise and stay with the base units I have, and so choose and possibly rearrange one of those designs. The major differences with the older designs seem to be the dividors, the positioning of the driver in the path of the line...etc
As for the b110 and the t27, since I have 'em along with the crossovers, I might as well put it together for the time being.
Thank you very much for sharing all this with me.
best regards
angelo e.
Hello Dave, hello everyone,
I have modeled this speaker and I would like to have a comment or two about it.
It is gonna be a b139b (since I already have those drivers). I followed some of the concepts you have put forth in this and other threads, about not too many folds, about slope around 6 degrees, about placing the driver 1/3 or so from the closed end...etc
Any input would be appreciated greatly.
BTW I started with a TL50 that id was way too "foldy" and it was too "accommodating" as a design and gave me the idea that I could come up with a little simpler and thus better config.
In this, the mid a b110b and a t27, will be sitting on separate box on top of it.
Do you think that 2.7m long tunnel is way too much?
do you think that 220 litters is also too much?
I have modeled this speaker and I would like to have a comment or two about it.
It is gonna be a b139b (since I already have those drivers). I followed some of the concepts you have put forth in this and other threads, about not too many folds, about slope around 6 degrees, about placing the driver 1/3 or so from the closed end...etc
Any input would be appreciated greatly.
BTW I started with a TL50 that id was way too "foldy" and it was too "accommodating" as a design and gave me the idea that I could come up with a little simpler and thus better config.
In this, the mid a b110b and a t27, will be sitting on separate box on top of it.
Do you think that 2.7m long tunnel is way too much?
do you think that 220 litters is also too much?
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