slot port design |
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Elliot Thompson
Old Croc Joined: 02 April 2004 Location: United States Status: Offline Points: 5175 |
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Actually, I put more trust in Eminence that has made loudspeakers for nearly 60 years, in addition to my own measured results through LIMP. However, if you can show me a measured result of an Le response from 100 Hz down I will stand corrected. Are you game? Best Regards,
Edited by Elliot Thompson - 19 August 2022 at 11:48am |
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Elliot Thompson
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Elliot Thompson
Old Croc Joined: 02 April 2004 Location: United States Status: Offline Points: 5175 |
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That is a Reflex. Best Regards,
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Elliot Thompson
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fatfreddiescat
Young Croc Joined: 15 October 2010 Location: N.E.Wales Status: Offline Points: 1083 |
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Eminence, a company that put THEIR trust in Klippel
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Elliot Thompson
Old Croc Joined: 02 April 2004 Location: United States Status: Offline Points: 5175 |
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Yet, no one is debating...
In which, I stated...
Continue....
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Elliot Thompson
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fatfreddiescat
Young Croc Joined: 15 October 2010 Location: N.E.Wales Status: Offline Points: 1083 |
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The info from Eminence is correct but it isn't the whole story re motor behaviour as explained in the info Toasty has linked to. It appears it becomes relevant when Le is of a similar or higher value than Re as is the case in some large VC drivers.
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Elliot Thompson
Old Croc Joined: 02 April 2004 Location: United States Status: Offline Points: 5175 |
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That does not play a factor when you are using a tuned port at 40 Hz - 50 Hz as snowflake is considering. The port is going to activate at the tuning frequency. I understand where you are coming from. However, you are still looking at things from a Horn's perspective. Reflex follows a different principal. Once you port a horn to extend the low frequency response, you are essentially using a combination of a horn and reflex box. By doing so, any frequencies that falls within the port's tuning needs to follow the reflex topology in order to achieve optimum results. Hence VAS, fs and, Qts are the vital numbers. Best Regards, |
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Elliot Thompson
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snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3122 |
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Fs Qts and Vas can be used to determine reflex alignments that have a desired response. But take the horn away from my design and sim it as a vented rear chamber and you get a huge peak at the port frequency - it's not any recognised alignment. So what use are t/s parameters selecting a driver for a ported horn? |
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toastyghost
The 10,000 Points Club Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10919 |
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All of Klippel’s work is based on sealed and ported enclosures you might realise that if you read any of it Edited by toastyghost - 20 August 2022 at 6:33pm |
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Contour
Young Croc Joined: 03 March 2004 Status: Offline Points: 624 |
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Slot ports mostly have an advantage above round ports because they are using the cabinet walls and often have larger cross section (and length). For equal cross section I personally prefer round ports with large flares. For example the Intertechnik Jetset series.
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snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3122 |
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I've never seen a flared port bigger than 100mm though and with these drivers need more than that. |
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Contour
Young Croc Joined: 03 March 2004 Status: Offline Points: 624 |
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You can use more, but I agree, with large drivers the advantage is shifting to slot port, also much cheaper.
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