Basic Q about port diameter(s)

joensd · 29th April 2004, 01:09 PM

Hi,
I´m in the process building a ML-TL and I love to use what I have on hand.
I´ve got two 2.36in diameter ports lying around which are angled and end after a lenght of 3.78in with a diameter of 2.165in.

The only literature I have around is the german translation from Vance Dickason (not so cool BTW) and I wondered there is not one comment about angled ports.

Which diameter do I have to calculate with?
Or is it rather worth buying or finding a "straight" port for maybe easier and more successful tuning of the ML-TL.

TIA
Regards
Jens

Ron E · 29th April 2004, 02:12 PM

If they are tapered (like a truncated cone - or frustum) I wouldn't use them - but it sounds like there isn't much of a taper, so it probably wouldn't matter much. If you must use them, I would go with the average diameter for port calculations.

joensd · 29th April 2004, 06:19 PM

Thanks for the advice.
I´ll have a look what mathcad says about the average diameter but will check if I can get another straight port just in case.
Don´t want to get into trouble once the port-hole in the baffle is cut.

Regards
Jens

29th April 2004, 01:09 PM	#1
joensd diyAudio Member Join Date: Dec 2001 Location: Germany	Basic Q about port diameter(s) Hi, I´m in the process building a ML-TL and I love to use what I have on hand. I´ve got two 2.36in diameter ports lying around which are angled and end after a lenght of 3.78in with a diameter of 2.165in. The only literature I have around is the german translation from Vance Dickason (not so cool BTW) and I wondered there is not one comment about angled ports. Which diameter do I have to calculate with? Or is it rather worth buying or finding a "straight" port for maybe easier and more successful tuning of the ML-TL. TIA Regards Jens

29th April 2004, 02:12 PM	#2
Ron E diyAudio Member Join Date: Jun 2002 Location: USA, MN	If they are tapered (like a truncated cone - or frustum) I wouldn't use them - but it sounds like there isn't much of a taper, so it probably wouldn't matter much. If you must use them, I would go with the average diameter for port calculations. __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Science is a way of thinking much more than it is a body of knowledge. --Carl Sagan

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29th April 2004, 06:19 PM	#3
joensd diyAudio Member Join Date: Dec 2001 Location: Germany	Thanks for the advice. I´ll have a look what mathcad says about the average diameter but will check if I can get another straight port just in case. Don´t want to get into trouble once the port-hole in the baffle is cut. Regards Jens

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