well
the driver is 80mm/3.15" does it fit in?
maybe whe just make it square to make things easy.
i think i got it now,its time to sketch something.
the driver is 80mm/3.15" does it fit in?
maybe whe just make it square to make things easy.
i think i got it now,its time to sketch something.
Hi Nathenry,
Cal Weldon's suggestion in Post #217 sounds just fine too. Don't take this step too seriously, most commercial PA subwoofer enclosures will not have any stuffing at all. Just keep it away from the ports, and make sure it will stay in place where you put it. The ports have to be open to interact properly with the enclosure volume.
Regards,
Cal Weldon's suggestion in Post #217 sounds just fine too. Don't take this step too seriously, most commercial PA subwoofer enclosures will not have any stuffing at all. Just keep it away from the ports, and make sure it will stay in place where you put it. The ports have to be open to interact properly with the enclosure volume.
Regards,
Hi epa,
Post #218: "... was thinking of this one..."
The Dayton H10RW looks a little large to me, wouldn't it block the Beta-12A-2 mid-horn too much if mounted inside the grill? I still like the HM25-25, but I've heard neither one of them. The H10RW is definitely a lot less expensive.
Regards,
Post #218: "... was thinking of this one..."
The Dayton H10RW looks a little large to me, wouldn't it block the Beta-12A-2 mid-horn too much if mounted inside the grill? I still like the HM25-25, but I've heard neither one of them. The H10RW is definitely a lot less expensive.
Regards,
So if we want to add stuffing, add it to only 3 internal sides or all 4 internal sides
Both bass box are now completed
Thanks a milion Oliver and the entire diyaudio forum.
Both bass box are now completed
Thanks a milion Oliver and the entire diyaudio forum.
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The amount of stuffing and what kind depends a lot on what the XO point is. tb46 alluded to the fact that some commercial units use none at all. I can't really think this is the best way but I do know that he is right. I also know that every unit I have owned like that did itself proud with a little or even a full dose of rockwool insulation. The other thing I have noted is that partial blocking of the ports is not necessarily a bad thing, it all depends on what you are trying to achieve. In some cases I have had to block the ports to a point where you might want to call it aperiodic before I was happy. To each their own, have fun experimenting and don't be afraid to "make your ears happy" even though the books say it's not right. I haven't followed this thread enough to know whether the advice I have given is accurate but I suggest you find out for yourself, and always in the environment intended.
Also, poly-fil, while easy to work with is not my favourite, especially while trying to tame the lion.
Good luck, make your soldier proud. 🙂
Also, poly-fil, while easy to work with is not my favourite, especially while trying to tame the lion.
Good luck, make your soldier proud. 🙂
still tryning to find a suitable horn.
ill look into the hm25-25
tnx
edit/ lets stick with the hm 25-25
grtz
ill look into the hm25-25
tnx
edit/ lets stick with the hm 25-25
grtz
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ok here it is,im sure not all is clear in the beginnig,but feel free to ask.
outside boards are 3/4"(18mm)
all inside boards are 1/2"(12mm)
outside boards are 3/4"(18mm)
all inside boards are 1/2"(12mm)
epa
Thanks for the drawing can you change the background color of the drawing so it can be more viewable when printed out.
Also can you detail the plan like how Oliver done his with a cut sheet and showing where all the pieces should go. That way we understand the drawing much better when cutting and assembling the box.
thanks
Thanks for the drawing can you change the background color of the drawing so it can be more viewable when printed out.
Also can you detail the plan like how Oliver done his with a cut sheet and showing where all the pieces should go. That way we understand the drawing much better when cutting and assembling the box.
thanks
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Hi Nathenry,
Post #231: "... stuffing, add it to only 3 internal sides or all 4 internal sides..."
My way of doing this has usually been: bottom, back and one side. Once upon a time I used to use fiberglass insulation, today I prefer polyfill batting (mainly from a handling standpoint). Cal is right in Post #232 "..make your ears happy...". For starters I would keep the material away from the port openings. What you are trying to do is to reduce sound waves bouncing back and forth between parallel internal walls.
Regards,
Post #231: "... stuffing, add it to only 3 internal sides or all 4 internal sides..."
My way of doing this has usually been: bottom, back and one side. Once upon a time I used to use fiberglass insulation, today I prefer polyfill batting (mainly from a handling standpoint). Cal is right in Post #232 "..make your ears happy...". For starters I would keep the material away from the port openings. What you are trying to do is to reduce sound waves bouncing back and forth between parallel internal walls.
Regards,
Hi epa,
Posts: #219 #226 #235
Does that 45 degrees rotated square post in the horn center work as a phasing plug? Looks interesting.
In the Hornresp simulation you have Vrc=10 L, and Vtc=364.75 cm^3, are these (and the other values in the simulation) values calculated from the drawing?
Regards,
Posts: #219 #226 #235
Does that 45 degrees rotated square post in the horn center work as a phasing plug? Looks interesting.
In the Hornresp simulation you have Vrc=10 L, and Vtc=364.75 cm^3, are these (and the other values in the simulation) values calculated from the drawing?
Regards,
hi all.
updated the pic for the printer.
oliver
the dimensions are corected after the drawing is finshed(yes it seems strange the last 3 sections looks conical but the middle thingie makes it right),except vtc/atc wich was given by >system design with driver.
clearly whe should make this space as small as posible to keep hf.
vrc should be from 10 to max 20 ltrs so whe need to take out some volume by puting in hard foam blocks/or bild a chamber in the chamber.
grtz
edit/ phase plug is not realy the correct term.
it equals out different path lenghts towards the throat a bit ,as oposed to just a hole in the middle
updated the pic for the printer.
oliver
the dimensions are corected after the drawing is finshed(yes it seems strange the last 3 sections looks conical but the middle thingie makes it right),except vtc/atc wich was given by >system design with driver.
clearly whe should make this space as small as posible to keep hf.
vrc should be from 10 to max 20 ltrs so whe need to take out some volume by puting in hard foam blocks/or bild a chamber in the chamber.
grtz
edit/ phase plug is not realy the correct term.
it equals out different path lenghts towards the throat a bit ,as oposed to just a hole in the middle
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Hi epa,
Post #238: "...edit/ phase plug is not realy the correct term. it equals out different path lenghts towards the throat a bit ,as oposed to just a hole in the middle..."
I agree, I looked at this in some detail while drawing a mid-horn for the Beta-12A-2 similar to the one I drew for the Selenium 10PW3 in ACAD, and decided that the horn needs a phase plug - and it needs a reduced volume rear chamber - to even out and extend the response. That's when I gave up on the thing.
I don't have a Beta-12A-2 on the shelf, and Eminence does not provide decent drawings of their products; but I took a stab at it, and arrived at a throat volume of about Vtc=1622 cm^3 with an area of Atc=585.3 cm^2. (As always: your math may vary 🙂.)
Regards,
Post #238: "...edit/ phase plug is not realy the correct term. it equals out different path lenghts towards the throat a bit ,as oposed to just a hole in the middle..."
I agree, I looked at this in some detail while drawing a mid-horn for the Beta-12A-2 similar to the one I drew for the Selenium 10PW3 in ACAD, and decided that the horn needs a phase plug - and it needs a reduced volume rear chamber - to even out and extend the response. That's when I gave up on the thing.
I don't have a Beta-12A-2 on the shelf, and Eminence does not provide decent drawings of their products; but I took a stab at it, and arrived at a throat volume of about Vtc=1622 cm^3 with an area of Atc=585.3 cm^2. (As always: your math may vary 🙂.)
Regards,
i want to extend the"phaseplug" in to the cone area to reduce volume even more, puting some square discs on it,but first whe need actual measurements on the beta 12a-2.
also there needs to be some cuting in the front of the cross to fit the horn.
the driver fits into the square.
but these details come later.
also there needs to be some cuting in the front of the cross to fit the horn.
the driver fits into the square.
but these details come later.
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