Portsize with different port diameter help |
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0krizia
Registered User Joined: 15 February 2016 Location: norway Status: Offline Points: 79 |
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Posted: 31 January 2018 at 6:29am |
Hello. I got a pair of wharfedale impact 15 top speakers im planning to re-tune. The port are 8 cm tall, 45cm wide in the front and 26cm at the rear end. How does this shape impact tuning frequency? Does an ever increasing surface area give a lower or higher tuning than a constant surface area?
The reason why I am asking is because I am curious about how i will extend the port. Shall i continue the decrease of the surface area or increase it for lowering the tuning frequency efficiently. Edited by 0krizia - 31 January 2018 at 6:36am |
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stevie
Registered User Joined: 16 March 2008 Location: Dorchester Status: Offline Points: 425 |
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As far as I know, port shape doesn't really affect the tuning frequency. To lower the tuning frequency, increase the depth of the shelf. Making a port longer tunes it lower.
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JonB67
Young Croc Joined: 22 April 2016 Location: UK Status: Offline Points: 1376 |
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Id extend it at the same size as its narrow point then test for port noise as well as retuned frequency.
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mobiele eenheid
Old Croc Joined: 15 August 2004 Location: Netherlands Status: Offline Points: 1568 |
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Increasing port area over length, increases the tuning frequency.
If you increase port length or port area at the inside of the cabinet, this will lower the tuning frequency. However any decrease in cabinet volume, will partially counteract this, by raising the tuning frequency. Easiest would be to simulate this in Hornresp. Regards |
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airbell
Registered User Joined: 11 June 2009 Location: Berlin, Germany Status: Offline Points: 284 |
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You would lower the tuning frequency most efficiently if you would continue decreasing the surface area, but on the other Hand maybe the surface area at the port beginning would be too small then and cause air noises so, I would keep it the same area and just extend it.
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