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Database simulation |
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Alexandre 25 
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Joined: 26 October 2019 Location: france Status: Offline Points: 1 |
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 Topic: Database simulationPosted: 26 October 2019 at 4:29pm |
Hello everyone
I am looking for akabak curve for the Beyma sb12,sb15 with the script if you have this.
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mhtplsh
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Joined: 27 August 2007 Status: Offline Points: 112 |
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Posted: 11 July 2017 at 2:01pm |
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From where you use 1.8 in the calculations. The plywood here is 12mm thick.
Please let me know what do you mean by ATC and vtc should be switched. |
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Daniel Twellmann
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Joined: 02 October 2011 Location: Denmark Status: Offline Points: 48 |
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Posted: 08 July 2017 at 2:17pm |
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Yes, I just showed how 1108 was calculated :)
ATC and vtc should be switched around Edited by Daniel Twellmann - 08 July 2017 at 2:18pm |
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Contour
Young Croc 
Joined: 03 March 2004 Status: Offline Points: 623 |
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Posted: 08 July 2017 at 9:24am |
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Atc should be an area not a volume?
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Daniel Twellmann
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Posted: 08 July 2017 at 8:45am |
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14cm*14cm*pi*1.8cm = 1108cm^3
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mhtplsh
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Posted: 24 June 2017 at 3:37am |
I am not able to understand how atc 1108 is calculated here. Herewith posting picture with detailed drawing.  of MT 121. |
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Junior253
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Posted: 22 April 2016 at 8:55am |
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thank a lot for your response
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tv00
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Joined: 10 August 2009 Location: Denmark Status: Offline Points: 1886 |
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Posted: 20 April 2016 at 2:15pm |
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I think all you got to do is to add cone & cutout volume to rearchamber, and remove reardriver volume from frontchamber. (cutout volume depends on from which side driver is mounted. Remember polarity might be reversed (or not if phase shifts at crossover freq)
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www.facebook.com/babysoundsystem
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DMorison
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Joined: 14 March 2007 Location: Aberdeen Status: Offline Points: 1649 |
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Posted: 19 April 2016 at 12:42pm |
Perfectly normal front loaded horn, Rear Chamber is quite large (may give slight bandpass effect), the fact that the driver is reversed makes no difference other than reversing polarity when wiring it up and taking its volume out of the Throat Chamber Volume. S1 is the area at the narrowest part - there's a separate field for ATC (Area of Throat Chamber) which allows hornresp to account for the step down in area there. HTH, David.
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Junior253
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Posted: 19 April 2016 at 8:08am |
 how to simulate this type of load
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sgarfa
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Posted: 15 December 2013 at 6:03pm |
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Hi, i'm ame from italy, it's my frist post here, and i hope to be in the right forum place....anyway i decided to create 2 new horn loaded sub, each whit 2 rcf l15p200ak speakers, i know theat speakers are for reflex anclosures, but I found it for little money. then I thought of starting to this plan:
http://hornplans.free.fr/eliminator2x15.html because it also has a small rear chamber for reflex. these are the results without changing anything in the plan ( i hope to be set well horn resp) https://imageshack.com/i/0as2v5j https://imageshack.com/i/f2pm9fj I wonder how it is possible to stabilize the db, between 40-200hz increase the db up to 300hz, of course, after improvements I provide al the plan in dwg. Edited by sgarfa - 16 December 2013 at 10:10am |
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tv00
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Joined: 10 August 2009 Location: Denmark Status: Offline Points: 1886 |
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Posted: 18 September 2013 at 7:45pm |
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Ok, here's my simulation results for the Danish fane TT1000 cab loaded with fane 18-1500
Surprisingly it looks better than the es18-bph even though it's 30 years old! To be fair ES18-BPH was designed for another driver than simulated. I started sim without taking the narrow fold and the straight exit into account, but finally I did take them into account and instead dropped one panel. There was several surprises: The narrow area in the fold increases the upper freq sensitivity The straight exit increases low end sensitivity a tiny bit Rear loading the cab gives a better high end response, but I hear more sub! Input screen taking that into account, I can post the simple front loaded sim too:  Here we go, BLACK TT1000 front loaded unlike the sim, GREY ES18-BPH  NOTE: to sim this increase rear chamber by 10L & decrease front chamber the same. REARLOADED like the sim looks even better, but not deeper, -but is sounds deeper with b600: BLACK TT1000, GREY ES18-BPH  Not too bad for a 30 year old design hu? Even looks better, I even guess collecting these were cheaper than building news, they were £ 100 each at max. Edited by tv00 - 19 September 2013 at 5:52pm |
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bitzo wrote: