I don't have the pleasure at the moment of doing a build, but am kind of figuring out the process for executing one successfully for when I do have the opportunity.
When you are calculating or subtracting volume from an enclosure, how do you account for the roundovers on a port? Is it the volume of the port plus 1/3 of volume of roundover on each end or something like that, or do you just ignore the volume of the roundovers?
I have never heard of factoring in roundovers in volume calculations. I think the volume difference would be negligible and have no impact on your results.
You should definitely be measuring port length to include the length to the end of the roundovers, though.
So ignore the volume of the roundovers and calculate volume from port length, or ignore roundover volume and calculate volume from port length plus the axial length of the roundovers? By ignoring the volume from to the ends of the port, with say a 1/2" roundover, I'd be losing 1" of port length essentially. Is the enclosure volume really not that critical to do that? :huh: Sorry for being confused on the point.
Sure, make it easy and calculate port volume based on total length and outter diameter. You will only be leaving out the flare itself. When you build your box, making one dimension 1/16" too long or short (how many boxes get built to a much tighter tolerance than that?) will have a bigger impact than factoring in port flare volume!
That's very true, thanks for putting it that way onder:. You would be looking at much larger magnitudes of volume change with inaccurate enclosure dimensions vs the roundover volumes.
Oh... Now I feel like a moron. I have messed around with WinISD, but I guess I haven't noticed that feature before. Sorry, the engineer in me had to ask about including or excluding even something so trivial as the volume of the roundover.
There is always the half radius of the round over that can be measured. All you need to do for that method is to add one full radius length to the overall port length. Cant find the link right now, but that is the general way to account for flared ports.
Don't forget that WinISD does not subtract port volume, the volume you enter is the net usable volume to the driver and nothing more.
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