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Old 2nd December 2012, 10:38 AM   #1831
epa is offline epa  Netherlands
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do you have a plan or is this just a sim?
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Old 2nd December 2012, 11:09 AM   #1832
AndrewT is offline AndrewT  Scotland
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Originally Posted by Matthew Morgan J View Post
.............................., but of course we wont know for sure if it works until someone builds one .. I am hoping to have access to a cabinet shop here again in the near future and i think i might give it a whirl ...................
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do you have a plan or is this just a sim?
He has already told you it is not built !
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Old 2nd December 2012, 11:19 AM   #1833
epa is offline epa  Netherlands
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He has already told you it is not built !
im not asking if someone bild it,
im asking is there some sort of plan(fold)
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Old 2nd December 2012, 11:21 AM   #1834
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do you have a plan or is this just a sim?
Hey there Epa,
Just a sim so far, and it was a sim to sim comparison that i was making.. I know that actual measured results can be different ...
I think i will try to draw up some plans but i haven't yet developed the keen folding and sketching skills that many more seasoned folks on here possess, so it will probably be simple .... Just a single fold version to start..
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Old 2nd December 2012, 02:11 PM   #1835
epa is offline epa  Netherlands
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hi mattew
that would be the chalenge.
single fold migth work,but a somewhat more square form would be nice.
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Old 2nd December 2012, 02:28 PM   #1836
NEO Dan is offline NEO Dan  United States
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@ Matthew
OK great, so when are you starting a thread with drawings and measurements???



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Old 2nd December 2012, 03:12 PM   #1837
NEO Dan is offline NEO Dan  United States
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I don't see what all the excitement is about:
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Old 2nd December 2012, 11:54 PM   #1838
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Neo Dan ,
Keep in mind that the 18PS76 and 3015LF both have an RE of 5.3 ohms ... At 2.83 volts the comparison looks like the screen shot i took of hornresponse which is attached to this message ... You can see the increased output at 40 & 50 hertz .... I wish it had more output at 60 but you always have to compromise somewhere right?
Brian Steele's "DFD" style constriction should improve the extension further and fill in the big dip at 180 hertz but i don't imagine it will give me any gains at 60..
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Old 3rd December 2012, 12:03 AM   #1839
NEO Dan is offline NEO Dan  United States
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Oops I was at 2v mah bad.
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Old 3rd December 2012, 12:44 AM   #1840
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Its cool Neo Dan ,
I know that B&C does make some 4 ohm 18" drivers so its an understandable mistake ....
To answer your and EPA's questions about plans & measurements I think i will just cook up some cheesy sketch with the basic dimensions and then i will cobble together a single fold version out of cheap OSB just to make sure that this TH works well in real life ... If i'm happy with the way it performs I will then build something out of a good plywood, cube shaped ideally as EPA suggested If i can figure out how to manage the folding bit ..

I think i almost have the dimensions for the single fold version worked out , I know these are rough and will probably revise them a few times but accounting for the airspace taken up inside by the single internal panel i ended up with something like 43.3"x20"x18.5" ....
If i can get away with reducing the width by another half inch then it could have a nearly square footprint with 43.3"x19.5"x19" but it will be a pretty tight fit for the woofer..... The DFD constriction will probably end up around 1/3rd of the way up the pipe from the mouth, but that will have to be measured and adjusted to find the exact spot ..
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