I think more of a simple math question but I can't seem to get it straight. I am working on the recommended FE126E enclosure which is a hybrid back loaded horn / bass reflex design. Anyway I want to convert the port to english units from millimeters (don't have an 30 mm pipe!)
I know the port is 30mm diameter and 115 mm in length and Fb is 55 Hz
Due to the design I don't know what to include to calculate the enclosure volume.
What would the length need to be to use 1.5" port?
Thanks in advance,
Tim
Here is a link to the design:
http://www.madisound.com/pdf/fostexcabs/fe126e_encl.pdf
😕
I know the port is 30mm diameter and 115 mm in length and Fb is 55 Hz
Due to the design I don't know what to include to calculate the enclosure volume.
What would the length need to be to use 1.5" port?
Thanks in advance,
Tim
Here is a link to the design:
http://www.madisound.com/pdf/fostexcabs/fe126e_encl.pdf
😕
If you use the ratio 1"=25.4mm that's close enough for most applications. I've started a thread on the enclosure you want to build here, where I think a few of us are considering it:
Fostex FE126E reference design opinions
Feel free to join us and let us know how you get on.
Good luck,
Steve
Fostex FE126E reference design opinions
Feel free to join us and let us know how you get on.
Good luck,
Steve
Thanks for the reply and I will keep an eye on that thread to see what others are trying out.
I don't have any issue converting the mm to inches but the port comes out to 1.18" in diameter and 4.5" long. I don't have any material that is that diameter and wondered how to calculate the new length if I change the diameter to 1.5"..
Maybe I'm not making sense...
(wouldn't be the first time)
Tim
I don't have any issue converting the mm to inches but the port comes out to 1.18" in diameter and 4.5" long. I don't have any material that is that diameter and wondered how to calculate the new length if I change the diameter to 1.5"..
Maybe I'm not making sense...
(wouldn't be the first time)
Tim
Greets!
Ron E's take on scaling vents:
.........L1/L2 = A1/A2, where L1, A1 are the original length and area, and L2,A2 are the new length and area... rearranging again, and Realizing that area is proportional to diameter squared:
L2 = L1*(D2^2/D1^2), where D2 is new diameter and D1 is the original diameter.
FWIW, *in sims* using MJK's WSs I found that accounting for the end correction difference was more accurate, probably audibly so if a big change in diameter was made, but as always YMMV:
L2 = L1*(D2^2/D1^2)+(D2-D1)^2
GM
Ron E's take on scaling vents:
.........L1/L2 = A1/A2, where L1, A1 are the original length and area, and L2,A2 are the new length and area... rearranging again, and Realizing that area is proportional to diameter squared:
L2 = L1*(D2^2/D1^2), where D2 is new diameter and D1 is the original diameter.
FWIW, *in sims* using MJK's WSs I found that accounting for the end correction difference was more accurate, probably audibly so if a big change in diameter was made, but as always YMMV:
L2 = L1*(D2^2/D1^2)+(D2-D1)^2
GM
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