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Old 20th August 2013, 06:40 AM   #1021
Kjeldsen is offline Kjeldsen  Denmark
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There is a "tunnel" behind the fostex. It should be chamfered
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Old 20th August 2013, 03:42 PM   #1022
ScottG is offline ScottG  United States
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There is a "tunnel" behind the fostex. It should be chamfered
Yup!
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Old 20th August 2013, 04:37 PM   #1023
4Torr is offline 4Torr  United States
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Maybe a felt or foam lining inside the tunnel would reduce the standing wave and edge diffraction.
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Old 20th August 2013, 05:59 PM   #1024
planet10 is offline planet10  Canada
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Maybe a felt or foam lining inside the tunnel would reduce the standing wave and edge diffraction.
There is not enuff room to get a thick enuff chunk of either to be effective.

dave
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Old 20th August 2013, 11:45 PM   #1025
repeddler is offline repeddler  United States
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Actually I did chamfer..... but maybe not enough??

I painted that part brown because I couldn't figure out how to veneer that angle. Do I need to go deeper and/or wider? That is 2 pieces 3/4" ply glued together.
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Old 21st August 2013, 12:16 AM   #1026
planet10 is offline planet10  Canada
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Ideally the champher starts where the basket opens up.

Your baffle looks pretty thick, and would benefit from more champher.

dave
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Old 21st August 2013, 01:55 AM   #1027
gainphile is offline gainphile  Australia
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Celestion System 6000 loudspeaker system

Monopole Mid-High with dipole subwoofers. Circa 1996

www.stereophile.com/floorloudspeakers/892/index.html

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Old 21st August 2013, 04:16 AM   #1028
ScottG is offline ScottG  United States
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Originally Posted by repeddler View Post
Actually I did chamfer..... but maybe not enough??

Do I need to go deeper and/or wider?
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Ideally the champher starts where the basket opens up.

dave
Yes, exactly.

This is a good thing to know, especially with low mass full-range drivers where the resulting resonance can seriously disturb both the linear behavior of the driver, and its non-linear behavior (..and always in a negative fashion). Even most woofers should have this feature, but particularly full-range drivers and mids or dipole planar tweeters.

Sometimes the best method is a "lay-up" of 1/4 panels rather than one thick board so you can move the next successive layer of 1/4" board an inch or more away from the driver - increasing the opening (..and continue the "expansion" from there). Then you can use a router to angle those edges of each board. (..visually sort of an inversion of a Mayan Pyramid's "steps" with the rear opening getting wider and wider.)
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Old 21st August 2013, 04:21 AM   #1029
ScottG is offline ScottG  United States
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Old 21st August 2013, 05:50 AM   #1030
4Torr is offline 4Torr  United States
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Quote:
Originally Posted by repeddler View Post
Actually I did chamfer..... but maybe not enough??

I painted that part brown because I couldn't figure out how to veneer that angle. Do I need to go deeper and/or wider? That is 2 pieces 3/4" ply glued together.
It's probably fine as is. You chamfered. These guys will have you going for years with suggestions and opinions.
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