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Alter cabinet dimensions for a Classix II build?
Alter cabinet dimensions for a Classix II build?
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Old 1st September 2016, 02:24 AM   #1
klingstrom is offline klingstrom  United States
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Join Date: May 2016
Default Alter cabinet dimensions for a Classix II build?

Hey,

I'm new to Speaker building and about to put together my second pair of speakers. I've set my mind on Paul Carmody's Classix II. I like the simplicity of the cabinet bu would like to change the dimensions slightly. I trow together some rough blueprints in sketchup to make sure I would stick to about the same volume. It's no huge changes but the baffle is slightly more narrow and the drivers have been moved. Would this change (decrease) the intended sound for the speakers?

Original
Click the image to open in full size.



Narrow Baffle
Click the image to open in full size.

Thanks!
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Old 1st September 2016, 03:18 AM   #2
zman01 is offline zman01  Bangladesh
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Location: Dhaka
Alter cabinet dimensions for a Classix II build?
Hi,

My understanding is that the cabinet width should not be changed - it should remain 8.5" as the designer has specified. Change in cabinet width might affect the lower frequency performance, as the baffle step compensation in XO has been calculated for 8.5". Increasing the distance between drivers will increase their center-to-center distance, and that can affect the integration between the woofer and tweeter, so better to keep distance between drivers and tweeter distance from the top the same as the original design.

If you do change, it should be ok to change the height by a couple of inches and adjust the depth accordingly or vice versa.
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Old 1st September 2016, 03:23 AM   #3
PeteMcK is offline PeteMcK
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the change in baffle width will change the baffle step freq from 532Hz to 566Hz,
hardly any practical difference
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Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency
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Old 1st September 2016, 11:03 AM   #4
sreten is offline sreten  United Kingdom
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Hi,

Leave the drivers where they are. Add the 1" below them.
Losing 1/2" in width will be fine, only a very little difference.

rgds, sreten
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Old 7th September 2016, 03:47 AM   #5
klingstrom is offline klingstrom  United States
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Ok thanks everyone. So 1/2 inch narrower baffle seems fine then. Do I need too add the 1" bellow or can I add say half on each side or on the top of the baffle?

Thanks,
T
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Old 8th September 2016, 08:39 AM   #6
giralfino is offline giralfino  Italy
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Maybe sreten's comment wasn't clear enough, so I'll rephrase it.
If you want to increment the baffle height, do it under the woofer, and leave tweeter position in respect to the above boundaries the same as before. If you add 1" above the tweeter you will significantly change the diffraction effect, and since this is a "well thought" design I bet the change won't be for the best.

Ralf
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Old 9th September 2016, 04:48 AM   #7
klingstrom is offline klingstrom  United States
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Got it! Thanks!
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