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Old 30th June 2013, 02:30 AM   #1
zman01 is offline zman01  Bangladesh
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Default Difference in port depth?

Dave,

Would like to draw your attention to the CGR dCHR-Ken plans.

There are 2 versions - one wide and shallow, and the other narrow and deep. Though box dimensions are same, I see a difference in port size. Screenshots from plans attached for your reference.

Can you explain please?

Also see something like a "divider" in the port for the narrow-deep plan (I have drawn a red arrow indciating it) - but no measurements.

- Zia
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File Type: jpg dCHRKen1.jpg (50.0 KB, 142 views)

Last edited by zman01; 30th June 2013 at 02:33 AM.
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Old 30th June 2013, 03:05 AM   #2
Jsixis is offline Jsixis  United States
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port depth sizes vary according to the size of the whole and round vs square, the sound is the same although some people can claim to hear a difference.
As a amateur speaker builder I always aim for the least complicated port
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Old 30th June 2013, 04:15 AM   #3
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I'll have to do some checking, i suspect that the narrow/deep should not have a vent spacer.

dave
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Old 30th June 2013, 05:27 AM   #4
zman01 is offline zman01  Bangladesh
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Quote:
Originally Posted by planet10 View Post
I'll have to do some checking, i suspect that the narrow/deep should not have a vent spacer.

dave
Thanks Dave.

Appreciate if you can come back on the port depth also - 204 mm vs 226 mm as per the drawings.

Regards,
Zia
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Old 2nd July 2013, 05:39 AM   #5
zman01 is offline zman01  Bangladesh
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Dave, gentle reminder on checking the port size.
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Old 2nd July 2013, 06:13 AM   #6
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I'm on slow right now... it is in the queue.

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Old 2nd July 2013, 06:28 AM   #7
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Just checked. They are both correct. You will note that the wide has a lomger vent so needs nore x-section. If you wanted you could exchange the vents -- they are equivalent

dave
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Old 2nd July 2013, 08:35 AM   #8
zman01 is offline zman01  Bangladesh
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Thank you Dave.
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Old 28th September 2013, 07:55 PM   #9
glemmy is offline glemmy  Sweden
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Quote:
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Just checked. They are both correct. You will note that the wide has a lomger vent so needs more x-section. If you wanted you could exchange the vents -- they are equivalent

dave
Hi Dave,
sorry but I did not quite catch the explanation in your post.
I'm in the middle of a build of the narrow ones and I have made a mistake making the port a half cm too long (I am using thicker panels).

But looking at the drawing the wide speaker's port is 15x142x226mm and the narrow should be 15x142x204.
So should there be a divider in the middle of the narrow speakers's port as the drawing suggests? (although there are no length-dimension for this divider and it can only be seen in front view).

Thank you

Last edited by glemmy; 28th September 2013 at 08:03 PM.
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Old 29th September 2013, 05:05 AM   #10
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The speacer runs all the way to the back. If you made the shelf too long the width of the spacer will need to decrease. I can recalc (but not tonite i'm knackered). The vent is exactly 1 cm too long?

dave
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