throat sizes for V18-1000 - hornresp

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   hello guys, 

i have been working out a rough plan for a rear loaded horn for the void 1000, 
used the equations found here to aid me. http://fullrangedriver.com/singledriver/horndesign.html 

using those equations i ended up with 2.73cm2 which really does not seem right....(although i dont actually know)

been using hornresp and have hit some issues. my impedance and frequency plots are all over the place are there any pointers that anyone can suggest that might be a major factor? compression ratio? length of horn? flare rate? 

Thanks 

Tom 

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collision Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 09 January 2011 Location: Leeds Status: Offline Points: 174	Post Options Post Reply Quote collision Report Post Thanks(0) Quote Reply Topic: throat sizes for V18-1000 - hornresp Posted: 15 February 2012 at 4:23pm
	hello guys, i have been working out a rough plan for a rear loaded horn for the void 1000, used the equations found here to aid me. http://fullrangedriver.com/singledriver/horndesign.html using those equations i ended up with 2.73cm2 which really does not seem right....(although i dont actually know) been using hornresp and have hit some issues. my impedance and frequency plots are all over the place are there any pointers that anyone can suggest that might be a major factor? compression ratio? length of horn? flare rate? Thanks Tom
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doober Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 03 January 2006 Location: Cornwall UK Status: Offline Points: 802	Post Options Post Reply Quote doober Report Post Thanks(0) Quote Reply Posted: 15 February 2012 at 8:11pm
	Are you certain you did the conversion of VAS into cubic metres, and the conversion of At into cm2 correctly? There are 1000 litres in a cubic metre, 10000 cm2 in a m2. Ive made mistakes with these way too many times....
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JR.junior Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List Registered User Joined: 14 December 2009 Location: Slovenija Status: Offline Points: 810	Post Options Post Reply Quote JR.junior Report Post Thanks(0) Quote Reply Posted: 15 February 2012 at 9:54pm
	You don't need to make conversions. You just put the values in the equation as they are and the result you get are cm2. You should get 27,3cm2 Edited by JR.junior - 15 February 2012 at 10:00pm
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doober Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 03 January 2006 Location: Cornwall UK Status: Offline Points: 802	Post Options Post Reply Quote doober Report Post Thanks(0) Quote Reply Posted: 16 February 2012 at 7:58pm
	I make it 273cm2, it is necessary to use the correct units in the formula or the result ends up one decimal place out. 273cm2 is probably still too small a throat area for an 18" driver though. What frequency range were you looking for Tom? You may find that a suitable flare rate makes the horn ridiculously long with such a small throat. Kieran
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