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Old 7th May 2011, 07:43 AM   #1
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Default rectangular - round port?

as per this rough drawing.

will this effect tuning much/at all? should I be worried? has anyone actually done something like this?!

its drawn with one side missing so you can see whats going on, area of the rectangular section is the same as the round section

Click the image to open in full size.
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Old 7th May 2011, 01:05 PM   #2
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it will be unpredictable, but nothing what a DMM and a bit of effort can not sort out.
search a bit around, you will find how to mesure the tuned freqvency once the box is done and speaker is installed, then you can make your changes to alter the tuning (cut the lenght a bit, re-mesure, and repeat until its good).

any wierdoo formation can be used, it just takes more time and effort.
not sure about rezonances in a setup such as that, but i would figure it does not realy count in this case.
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Old 7th May 2011, 02:19 PM   #3
Ron E is offline Ron E  United States
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where does the round part go? why make it round at all?
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Old 7th May 2011, 02:22 PM   #4
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Quote:
Originally Posted by Ron E View Post
where does the round part go? why make it round at all?
Click the image to open in full size.
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Old 7th May 2011, 05:53 PM   #5
Ron E is offline Ron E  United States
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That port is probably big enough that you won't have issues with chuffing Best to run a sim, though.
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Old 8th May 2011, 01:46 AM   #6
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its 280mm diameter, 616cm^ for four 12inch subs.

4th order bandpass.

but now I've realised that in my intended box design, the port only needs to be 9.8cm long...
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Old 26th August 2011, 12:53 AM   #7
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so much has happened since I started this thread

maybe I'll some (a lot) of pics...

actually, I might start a new thread in the correct area...
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Old 26th August 2011, 12:57 AM   #8
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Toyota Aristo sedan, seats that don't fold, 4th order bandpass pics!
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