Yes
Thank you!
I see many people don't consider the volume of e.g. HF horn.
Moreover, what about driver itself? I'm trying to design vented cabinet for Fostex FF225WK and it has a big magnet. Calculated volume is 29L, magnet is somewhere around a half liter.
Make it bigger to benefit from LF extension, this only if you are interested. Size was mentioned in paper Fostex link as a 28L tuned to 39Hz with a 65x190 duct for 34-100W.
A 35L tuned to 38-39Hz and shorter port (14cm) will do the trick.
OK. What about vent port? Port is also included in total volume or it needs to be added to volume?
And also if vent is made of one inch plywood?
And also if vent is made of one inch plywood?
An externally hosted image should be here but it was not working when we last tested it.
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So I have to add this volume extra to calculated volume, right?
It becomes now a lot harder, because I'm going to calculate dimensions using golden ratio.
It becomes now a lot harder, because I'm going to calculate dimensions using golden ratio.
An externally hosted image should be here but it was not working when we last tested it.
To complicate matters further: the calculated vent length is usually too long, so once the speaker is finished, you will have to adjust it on the basis of measurements.
To make things easier: it doesn't really make a lot of difference if your volume is off by 10 percent or even more. Your drivers will be off by even more, so whatever you calculate is wrong to begin with.
If anything, it is better to be on the safe side, and build your enclosure a bit larger than calculated. If you decide it is too big, you can put a brick in it. The other way around is more difficult.
To make things easier: it doesn't really make a lot of difference if your volume is off by 10 percent or even more. Your drivers will be off by even more, so whatever you calculate is wrong to begin with.
If anything, it is better to be on the safe side, and build your enclosure a bit larger than calculated. If you decide it is too big, you can put a brick in it. The other way around is more difficult.
Well said!
Calculated imentions are as follows so far:
x~~196.1861492297573, y~~317.4358575756879, z~~513.6220068054039,
I guess you mention external dimensions? (Am I right?!)Well said!
Calculated imentions are as follows so far:
x~~196.1861492297573, y~~317.4358575756879, z~~513.6220068054039,
(port/speaker one inch plywood, from your notes)
Some prop that work:
Attachments
No, internal. I will share my drawing later. But first I have a question, which dimension is considered to be the port length? L1 or L2?
An externally hosted image should be here but it was not working when we last tested it.
L2 (material thickness of the cabinet makes no difference to the length of the port)
Add volume of internal parts to total cabinet volume.
The trouble with being so accurate is that you will have to keep the temperature of your room to + or - 0.000001 degrees C or expansion or contraction will ruin it.
Well said!
Calculated imentions are as follows so far:
x~~196.1861492297573, y~~317.4358575756879, z~~513.6220068054039,
The trouble with being so accurate is that you will have to keep the temperature of your room to + or - 0.000001 degrees C or expansion or contraction will ruin it.
Hehe
Yeah, I agree with you. It was only an equation result.x^3*phi^3-4*t^2*x-4*t^2*(phi*x-2*t)-4*t^2*(phi^2*x-2*t)-0.545*10^6-2*0.963*10^6=28*10^6, t=20, phi=1.6180339887498, y=x
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