t line enclosure

[juanmgarza26 10+ year member]

I want to experiment with a t line, I have really no definite answer, perhaps there is none, I know it requires quite a bit of space for a properly designed t line, what exactly are the advantages of a t line?

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[Jeffdachef 5,000+ posts]

wide bandwidth and great efficiency... IF done right lol.

 

[juanmgarza26 10+ year member]

I got a pair of rf p1's and I wanna see how these suckers will do in a t line with low power, I came across t lines and want to experiment with them

 

[black05alti]

like jeff said... really, really efficient and wide bandwidth. there's quite a few threads about t lines on diyma

 

[bbeljefe]

Another advantage of ¼ wave transmission lines is that they're super easy to calculate. Of course, that's offset by the difficulty in designing the box to fit in your vehicle but on balance, I think it's well worth the difficulty.

They play well throughout the sub bass region and normally extend to about one octave below driver Fs before going -3dB... which is super low compared with the response of a conventional ported enclosure tuned in the low 30s.

Drivers with a Qts above 7 and a Qes below 4 are best suited for them but any sub will perform its best in a t-line.

Here are some resources on them:

Transmission Line Speakers

Quarter Wavelength Loudspeaker Design

Here are a few I've built:

http://www.caraudio.com/forums/car-audio-build-logs-cars-trucks-suvs/587392-jbl-gto-10-%BC-wave-t-line.html

 

[UsAmpsFreak]

Another advantage of ¼ wave transmission lines is that they're super easy to calculate. Of course, that's offset by the difficulty in designing the box to fit in your vehicle but on balance, I think it's well worth the difficulty.
They play well throughout the sub bass region and normally extend to about one octave below driver Fs before going -3dB... which is super low compared with the response of a conventional ported enclosure tuned in the low 30s.

Drivers with a Qts above 7 and a Qes below 4 are best suited for them but any sub will perform its best in a t-line.

Here are some resources on them:

Transmission Line Speakers

Quarter Wavelength Loudspeaker Design

Here are a few I've built:

http://www.caraudio.com/forums/car-audio-build-logs-cars-trucks-suvs/587392-jbl-gto-10-%BC-wave-t-line.html

I've always heard that T-lines usually will give you far and away the highest output, it's just a pain in the *** to build them lol

 

[bbeljefe]

I've always heard that T-lines usually will give you far and away the highest output, it's just a pain in the *** to build them lol

Depends on what you mean by build. The actual build process is no more difficult than a properly constructed ported box but, designing them to fit in a vehicle can be a challenge, given that a line for a small sub with an Fs of 30Hz will be about 9' long.

And calculating one can be done with a simple, garden variety calculator... no software needed.

 

[juanmgarza26 10+ year member]

Wow the math is really not hard at all, dam a t line for a skar I have laying around would be quite a massive enclosure for one 12

 

[jrdnhsnbrg 10+ year member]

I wonder how long a t line for 4 8's would be... Brb gonna go try to figure this out lol

 

[juanmgarza26 10+ year member]

Which 8 are we talkin here?

 

[jrdnhsnbrg 10+ year member]

Not sure yet, either sundown sa8, IA I series 8, or cadence s2w8.

 

[juanmgarza26 10+ year member]

Divide 1120 by the fs of your choice of sub and divide that by 4

(1128/fs)/4 and that will be the length of your t line

 

[jrdnhsnbrg 10+ year member]

Divide 1120 by the fs of your choice of sub and divide that by 4(1128/fs)/4 and that will be the length of your t line

I'm getting 8.09 feet, would it make a difference with 4 subs over 1?

 

[Dub7sonoma Premium Member]

I'm getting 8.09 feet, would it make a difference with 4 subs over 1?

No. The length stays the same. Your line volume will be x4. The length of the line has to do with the fs of the sub. The diameter of the line increases with more cone area

 

[des343 10+ year member]

can you sacrifice length for depth in any way? and i see the 8 inch type r has a T-line box alpine created for it..i heard amazing things of that type r in that box..