TL vs vented: transient issues - diyAudio
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Old 2nd May 2013, 08:15 PM   #1
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Default TL vs vented: transient issues

Hi,

I read that TL give better transients than vented, apparently due to their shallower roll-off...But vented can also be tuned low...Now what real theorical advantages do TL offer?
Thanks.
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Old 2nd May 2013, 08:30 PM   #2
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Vented can be designed with good transient response if one designs the low frequency rolloff to be more gradual, like a Bessel function, instead of a sharp knee. In my experience this does take a larger box than other approaches. The trick is to play around in WinISD (or whatever) to get the gradual rolloff.
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Old 2nd May 2013, 10:23 PM   #3
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There is a huge range of performance differences available to a TL designer, much broader than with a BR. This makes your qustion more or less menaingless.

dave
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Old 4th May 2013, 08:00 PM   #4
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What I understand from your responses is that TLs don't necessary possess advantages vs other loading principles and that in this loading field designer's choices are more a matter of goals and drivers adaptation possibilities...Am I right?
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Old 5th May 2013, 03:12 AM   #5
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My intuitive understanding of a TL cabinet design is that it reduces the spill of music streaming out of the porting. Imagine that you stand deep inside of a labyrinth and scream. The person in the door way to the labyrinth will not hear you, but if he has an instrument that measures air pressure he will read a fluctuation in the door way. Music streaming out from a traditional porting pipe is a problem because makes the music experience muddy, ghost sounds.

A closed box design gives a better transience because of the air pressure speeding up the reset of the cone. If you imagine an infinite TL design where the sound "never" reaches the air gap, to the driver the cabinet is closed, which gives better transience. A TL cabinet doesn't need an air gap if the path of the sound is muffled by dressed walls and the volume is big enough to produce the sought roll off of the low bass. That is my understanding.

Last edited by strawberry; 5th May 2013 at 03:26 AM.
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Old 6th May 2013, 05:01 PM   #6
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There is a huge range of enclosures we call TLs (in the large sense). They range from designs with 4th order rolloff like a BR, to heavily damped aperiodic designs that approach sealed.

dave
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Old 6th May 2013, 07:08 PM   #7
PLB is offline PLB  United Kingdom
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Hi Crazyhub,

Here is an interesting review of the differences between the TL and VB --

http://www.linearx.com/files/pdf/EncShopApp_01.pdf

Peter
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Old 6th May 2013, 07:22 PM   #8
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That is a very dated paper (pre 2K from the approach) so only of historical interest. It is applicable to "classic TLs" which no designer who knows his stuff would design now a days.

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Old 6th May 2013, 07:57 PM   #9
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So what I understand from all this stuff is that TL cannot be stated to possess better transients than vented boxes because on both types we can choose different volumes, stuffing, areas, tuning fr and roll-off slopes...A matter of design choices, more than something else...
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Old 6th May 2013, 08:06 PM   #10
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Yes, but i'd say TL has the design breadth to be able to come up with something that does have better transient reponse than any BR box.

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