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1850 & 186 - why this diference?

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jaya000 View Drop Down
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    Posted: 21 May 2009 at 11:50am
There r horn resp input of 1850 & 186 in the post database simulation.
The horn is almost the same as we see.
But there is difference as under. Mainly S1 & S2. & horn length.
Which one is ok?
 
186 horn
s1=660
s2=4800
hyp=160
vrc=40
lrc=14
fr=40
tal=4
vtc=18000
atc=1200
posted by schiller http://www.speakerplans.com/forum/forum_posts.asp?TID=11248&PN=6

1850 horn
s1=480
s2=6000
exp=210
vrc=54.50
lrc=36
fr=0
tal=0
vtc=2340
atc=1150
posted by kpippen http://www.speakerplans.com/forum/forum_posts.asp?TID=11248&PN=2
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Jake_Fielder View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jake_Fielder Quote  Post ReplyReply Direct Link To This Post Posted: 21 May 2009 at 11:57am
I believe the horns are the same, its just that there is one peice of wood moved which dictates the rear chamber volume. S oi thing its just the rear chamber thats different,
smaller rear chamber for the 1850 "tighter" driver,
larger for the 186 "looser" driver. 186 will go a bit lower i think but not as loud.
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jaya000 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jaya000 Quote  Post ReplyReply Direct Link To This Post Posted: 23 May 2009 at 6:38am
Thanks Jake_Fielder.
My question is about horn size S1 & S2 of 1850 & 185.
Why the value of S! & S2 is different for hornresp as mentined in my above post
when the S1 & S2 are similar. Same thing about horn length also.


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Jake_Fielder View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jake_Fielder Quote  Post ReplyReply Direct Link To This Post Posted: 23 May 2009 at 12:28pm

Ah, i see what you mean, it depends where you take the throat to be, it could be the first bend, or it could be where the edge of the driver is. or even between the centre and edge of the driver etc...

Does it really make very much differance though. Model both with 1850 rear chamber and driver and see how much difference there is, also you could see which one is closer to Rogs charts on the main site...
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jaya000 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jaya000 Quote  Post ReplyReply Direct Link To This Post Posted: 24 May 2009 at 1:05pm
Thanks Jake_Fielder,
As u said, i want to know from where we should start throat in ur opinion.
But the more important is S2.  Why so much difference 4800 & 6000, when in both boxes it is same.
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jaya000 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jaya000 Quote  Post ReplyReply Direct Link To This Post Posted: 24 May 2009 at 1:22pm
This throat matter was discussed before also at
http://www.speakerplans.com/forum/topic11248_page2.html.
But  i was not able to come to any conclusion there hence asked this question.
I now expect/request Mr. Rog Mogale to just give Hornresp input parameter screen/data of 1850 & 186.
This way we will get answer right from Master. 
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levyte357 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote levyte357 Quote  Post ReplyReply Direct Link To This Post Posted: 24 May 2009 at 1:44pm
Originally posted by jaya000 jaya000 wrote:


1850 horn
s1=480
s2=6000
exp=210
vrc=54.50
lrc=36
fr=0
tal=0
vtc=2340
atc=1150
posted by kpippen http://www.speakerplans.com/forum/forum_posts.asp?TID=11248&PN=2


Sorry, but the Horn length on an 1850 Horn is not as stated above, and probably approx 160cm (5.5ft).
"Who am I? I'm the guy who does his job.. You must be the other guy".
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jaya000 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jaya000 Quote  Post ReplyReply Direct Link To This Post Posted: 25 May 2009 at 2:34am
Thanks levyte357,
I tried with changing the horn lengths in Hornresp to get the same frequency response as in 1850 plan. But failed.

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