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-   -   rectangular - round port? (http://www.diyaudio.com/forums/subwoofers/188553-rectangular-round-port.html)

ThyDntWntMusic 7th May 2011 06:43 AM

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 ;)

http://img215.imageshack.us/img215/8...horderport.png

Arty 7th May 2011 12:05 PM

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.

Ron E 7th May 2011 01:19 PM

where does the round part go? why make it round at all?

ThyDntWntMusic 7th May 2011 01:22 PM

Quote:

Originally Posted by Ron E (Post 2564469)
where does the round part go? why make it round at all?

http://img827.imageshack.us/img827/7408/subhole.jpg

Ron E 7th May 2011 04:53 PM

That port is probably big enough that you won't have issues with chuffing ;) Best to run a sim, though.

ThyDntWntMusic 8th May 2011 12:46 AM

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...

ThyDntWntMusic 25th August 2011 11:53 PM

so much has happened since I started this thread :p

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

actually, I might start a new thread in the correct area...

ThyDntWntMusic 25th August 2011 11:57 PM

http://www.diyaudio.com/forums/car-a...ml#post2686302


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