Closed/sealed box design strategy - diyAudio
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Old 27th February 2005, 10:49 AM   #1
Tyimo is offline Tyimo  Hungary
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Default Closed/sealed box design strategy

Hi!
I would like ask the experts about closed/sealed box design technics. What is the most prefered way:
-Butterworth (Qtc: 0.707)
-Bessel (Qtc: 0.577)
-Critically damped (Qtc:0.5)
What are the advantages of the closed ended TML boxes? (Like the Nautilus?)
What is the "best" closed box laudspeaker on Earth? :-)
Nowadays I can see most of time only vented designs. Why?

Greets:

Tyimo
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Old 27th February 2005, 11:17 AM   #2
Did it Himself
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There is no best design, it's all a matter of individual taste.

Lower Q sealed gives better transient response and group delay/phase at the expense of larger box and earlier roll-off.

Vented is popular because it gets lower cut-off and better efficiency, at the expense of transient response and group delay/phase. Box size is larger than closed, but not terribly so.

Different applications (sub, only main speaker, satellite etc.) require different approaches.
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Old 27th February 2005, 03:29 PM   #3
RJ is offline RJ  United States
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A test done on several Q points;
http://www.geocities.com/kreskovs/Box-Q.html

Watch out for room gain at a Q of 1.0....
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Old 28th February 2005, 10:50 PM   #4
mike.e is offline mike.e  New Zealand
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Quote:
Originally posted by RJ
A test done on several Q points;
http://www.geocities.com/kreskovs/Box-Q.html

Watch out for room gain at a Q of 1.0....
Hey that is rather interesting


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Old 1st March 2005, 04:29 PM   #5
Tyimo is offline Tyimo  Hungary
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Hi!
RJ thanks!
Interesting site!

Is there any rule of thumbs how to design a good closed end TML speaker?
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Old 2nd March 2005, 07:59 PM   #6
RJ is offline RJ  United States
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Is there any rule of thumbs how to design a good closed end TML speaker?

I'm guessing the L in TML stands for Transmission Line.
Here's a site that can explain it.
http://www.t-linespeakers.org/design/classic.html
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Old 3rd March 2005, 04:57 PM   #7
Tyimo is offline Tyimo  Hungary
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Hi RJ!

Thanks, I know this site already and there is nothing about closed end TML speaker design. :-(
I know that the closed box geometry need to absorb the back waves, but what about the TML 1/4 frequencies? It will be stronger?

Tyimo
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