T-Line Pick up bed

[kmastl 10+ year member]

Im interested in possibly building a TL box for my T212D2.. i was reading around and it looks suited to work well... "Usually, only drivers which have low Qts (0.25 - 0.4) , Qes (0.3 - 0.4) and Fs values are suitable for transmission line systems." It has a Qts of .38 and a Qes of .41.. and the Fs is 28 Hz Quarter wave length is what people appear to be doing.. "if your designing a transmission line, then you need to do a little more math. in transmission line design, you take speed of sound / frequency / 4. you divide by 4 for the quarter wavelength. so 1130/28/4=10.1 feet" here is where i have a question.. what if i were to do a TL line on both the front and back of the speaker and do a blow thought to the cab? would they cancel each other out.. each line comes out to be under 8 Cuft and i have about 22 to work with. also i would be powering it @1 ohm with 600 watts off my nine.5

Im open to all suggestions. Im looking to get the most output out of 600 watts with a blow through install. also im going to wait about 9 month to build sorry for the long post.

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[BrianChia 10+ year member]

A TL on both the front and rear of a speaker would just result in peaks and dips from the pipe resonance, but each pipe would be out of phase with the other. So essentially it is like listening to a T-line only through the rear of the line but then having another one next to it that was out of phase (peaky resonances and shitty phasing and cancellation problems). There is a reason why no one does a TL on both sides.

Now a tapped horn might be a better idea, do some research on that...

 

[mjf 10+ year member]

yeah taking from steve meades site.

there are enough flaws in that design that it shouldnt be used.

 

[kmastl 10+ year member]

are you saying there are too many flaws with using a T-Line? and i should decide on another type of enclosure?