T-Line for 1508'? - Realm of Excursion



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Old 10-08-2008   #1 (permalink)
 
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Default T-Line for 1508'?

I have been trying to decide what to put in the Diamante next(selling the 15" Q) and i've narrowed it down to either 2 1508's or 4 E8's.

Now if i get the 1508's I kinda wanna try to make a t-line because... well... it looks fun. I do have a USAmps XT2000D that they will be running on.

I'm looking for any kind of start off help. For the chamber do I still stick to the recommended size? and what tuning should I try?

Any other help would be greatly appreciated
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Old 10-08-2008   #2 (permalink)
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By the sounds of it, you probably don't know much about T-lines (no offense). Secondly, and more commonly, T-lines are mostly built incorrectly, and a properly built vented enclosure, a horn, or a higher order bandpass will be much louder. Finally, T-lines are known to reduce the Power handling capabilities, both thermally and mechanically.
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By the sounds of it, you probably don't know much about T-lines (no offense). Secondly, and more commonly, T-lines are mostly built incorrectly, and a properly built vented enclosure, a horn, or a higher order bandpass will be much louder. Finally, T-lines are known to reduce the Power handling capabilities, both thermally and mechanically.
Ya i know nothing about them except the general design and the response is usually flatter than a vent. Didn't know if i would get the overall output i wanted for lows and highs out of a vented box. Bandpass boxes I am pretty much clueless to but i'm always willing to learn. Just trying to get the best output i can from some 8's
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Old 10-08-2008   #4 (permalink)
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Originally Posted by MikeWilson View Post
By the sounds of it, you probably don't know much about T-lines (no offense). Secondly, and more commonly, T-lines are mostly built incorrectly, and a properly built vented enclosure, a horn, or a higher order bandpass will be much louder. Finally, T-lines are known to reduce the Power handling capabilities, both thermally and mechanically.
reduce thermal power handling??? NO

Mechanical??? Yes
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reduce thermal power handling??? NO

Mechanical??? Yes
So you guys seem to know what you're talkin bout so do I still make it the same size for the chamber. Like i was thinking 1.75-1.5 after displacement. I can't find a site to calculate the size or length of tuning.
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Old 10-08-2008   #6 (permalink)
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Originally Posted by Toad420 View Post
I have been trying to decide what to put in the Diamante next(selling the 15" Q) and i've narrowed it down to either 2 1508's or 4 E8's.

Now if i get the 1508's I kinda wanna try to make a t-line because... well... it looks fun. I do have a USAmps XT2000D that they will be running on.

I'm looking for any kind of start off help. For the chamber do I still stick to the recommended size? and what tuning should I try?

Any other help would be greatly appreciated
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Originally Posted by MikeWilson View Post
By the sounds of it, you probably don't know much about T-lines (no offense). Secondly, and more commonly, T-lines are mostly built incorrectly, and a properly built vented enclosure, a horn, or a higher order bandpass will be much louder. Finally, T-lines are known to reduce the power handling capabilities, both thermally and mechanically.


I suggest you both learn more. An improperly designed and built enclosure in any order will affect a driver significantly. Go here and read if you are interested in tlines.

You get a few people that try to design and build a higher order enclosure or quarter wave resonator. They choose ill-suited drivers along with the fact that the design is wrong from the getgo, due to posted half truths and walkthroughs. End up with horrid results, then just label the order inefficient and others quote them. Or on the other end of the spectrum they get lucky, label them godlike... then once again others quote them, unfortunately others dont share the same experience then. Learn theory and design, then practice... happy building.
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It has been remarked that if one selects his own components, builds his own enclosure, and is convinced he has made a wise choice of design, then his own loudspeaker sounds better to him than does anyone else's loudspeaker. In this case, the frequency response of the loudspeaker seems to play only a minor part in forming a person's opinion.

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Old 10-08-2008   #7 (permalink)
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I suggest you both learn more. An improperly designed and built enclosure in any order will affect a driver significantly. Go here and read if you are interested in tlines.

You get a few people that try to design and build a higher order enclosure or quarter wave resonator. They choose ill-suited drivers along with the fact that the design is wrong from the getgo, due to posted half truths and walkthroughs. End up with horrid results, then just label the order inefficient and others quote them. Or on the other end of the spectrum they get lucky, label them godlike... then once again others quote them, unfortunately others dont share the same experience then. Learn theory and design, then practice... happy building.
agreed.
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Old 10-09-2008   #8 (permalink)
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You get a few people that try to design and build a higher order enclosure or quarter wave resonator. They choose ill-suited drivers along with the fact that the design is wrong from the getgo, due to posted half truths and walkthroughs. End up with horrid results, then just label the order inefficient and others quote them. Or on the other end of the spectrum they get lucky, label them godlike... then once again others quote them, unfortunately others dont share the same experience then. Learn theory and design, then practice... happy building.
Agreed as well.

I will admit, I made a goof in saying that it comprimises the power handling thermally...more typing than thinking there.

Moving on, it should be considered that almost any enclosure type can almost replicate the sound of another enclosure type with a set orientation. Also, some people may like to spend their time, resources, and money wisely, and would benefit from knowing their idea is, without any doubt, a gamble. I told him what has the highest guarantee of a success, not an absolute, as I always will. On the other hand, if this person wishes to experiment, then amen, and "happy building".

On a side note, the link you provided is very technical, very thorough, and not for the average basshead. I've read every page on that site at least 2 or 4 times previously to this post, and will still say that the original poster of this thread should consider a ported or bandpass design.
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Old 10-09-2008   #9 (permalink)
 
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After reading(more trying than actual reading) of that T-Line website I've decided to give a bandpass box a try instead. Any ideas on tuning for 2 1508's in a bandpass? Also which order?
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Old 10-09-2008   #10 (permalink)
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After reading(more trying than actual reading) of that T-Line website I've decided to give a bandpass box a try instead. Any ideas on tuning for 2 1508's in a bandpass? Also which order?


Keep reading...
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Old 10-09-2008   #11 (permalink)
 
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So this is what i've come up with today...





But i can't find anywhere to calculate internal volume, tuning, or volume for the opening where the subs are faced at each other. Any help?

O and ports will be faced up or back....
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Old 10-09-2008   #12 (permalink)
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That appears to essentially be a ported enclosure with the subs aimed at each other. Im not sure if it would necessarily be classified as a bandpass.

I could be wrong, though...
This is a 4th order bandpass:
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Old 10-09-2008   #13 (permalink)
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So this is what i've come up with today...





But i can't find anywhere to calculate internal volume, tuning, or volume for the opening where the subs are faced at each other. Any help?

O and ports will be faced up or back....
So, you just randomly drew something up?!
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Thats like a isolobaric 4th order bandpass lol
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Old 10-09-2008   #15 (permalink)
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Thats like a isolobaric 4th order bandpass lol
Blah blah blah. I want to see your design! And get back to work!!!

6th order bandpass:
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Old 10-10-2008   #16 (permalink)
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Originally Posted by Toad420 View Post
So this is what i've come up with today...





But i can't find anywhere to calculate internal volume, tuning, or volume for the opening where the subs are faced at each other. Any help?

O and ports will be faced up or back....
Random drawing of a 4th order bandpass...if designed correctly it will have no where near the dimensions of that.
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Random drawing of a 4th order bandpass...if designed correctly it will have no where near the dimensions of that.
Duh there were no dimensions used on that just trying to get an idea of where i'm going... Both sides of that sketch aren't even identical. I want the subs to be visible when the middle of my back seat is flipped down. I'd prefer to keep it open but i will plexi the opening to make it a isobaric 4th order if needed.

I've been asking where to go to find calculations for figuring out how to get box volumes and tuning. But so far the posters just tell me to read more or that i know nothing... so please enlighten me.
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Old 10-11-2008   #18 (permalink)
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If you've never had any experience with designing and building a bandpass of any order than I wouldn't try unless you have time and money to build a few boxes.
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Old 10-13-2008   #19 (permalink)
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if I were you I would do alot more reading no offense but if you cant find out the internal volume with out a calculator then you should pay somebody for a design
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Old 10-13-2008   #20 (permalink)
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google winisd it should help alot
but ya alot of trial and error
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