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path length/delay time |
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antiG 
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Joined: 17 April 2007 Status: Offline Points: 127 |
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 Topic: path length/delay timePosted: 04 December 2007 at 11:47pm |
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hi does anyone know the path length of the 1850?
looking back through old threads 160cm seems to be coming up tho would like to confirm or alternatively the time delay for mid tops (not hornloaded and alligned with front of cab) got our first outing with new 1850s tmw so pls help if you can nice one |
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Jake_Fielder
Old Croc 
Joined: 08 October 2007 Status: Offline Points: 4231 |
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Posted: 05 December 2007 at 8:50am |
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IF it is 160cm then the delay should be: 4.658993 milliseconds Workings:
Speed of sound at 20dC is 343.4218310025016 meters per second
343.421831/214.6386443=1.6m
1second/214.6386443-0.004658993
So 1.6 meters takes 0.004658993 seconds or 4.658993 milliseconds
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Mark James
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Joined: 15 January 2006 Location: rig side Status: Offline Points: 5309 |
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Posted: 05 December 2007 at 9:23am |
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iirc the 1850 has a 5.5ft horn? about 160cm ish i think................
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me so horny me love you long throw
horn loaded for her pleasure |
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JaKe
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Joined: 14 September 2007 Location: N.E. Wales Status: Offline Points: 684 |
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Posted: 05 December 2007 at 9:58am |
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Download some demo software from Smaart, ETF or Speakerworkshop (freeware but temperamental, needs the right soundcard for a stable pulse response, good for impedance measurements) and use your PC mic to line up the impulse response peaks. Even better line up the phase response, you will need an accurate mic, the Panasonic capsules can do a decent job for around £10.
Lining up the distance from the voice coils is an approximation at best due to the effects of group delay. JaKe |
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antiG
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Joined: 17 April 2007 Status: Offline Points: 127 |
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Posted: 07 December 2007 at 1:03pm |
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cool, thanks for the help.. its not really possible at the minute to get a pc and equipment to get everything spot on, i know thats the right way to go when i can tho.. 160 cm approximation will have to be good enough for now
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Jake_Fielder
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Posted: 07 December 2007 at 1:13pm |
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Yea, wrighty said its just over 1.6meters aswell so i'd say 4.66ms should be good enough
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ceharden
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Joined: 05 June 2005 Location: Southampton Status: Offline Points: 11776 |
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Posted: 07 December 2007 at 1:44pm |
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Or for most jobs 1ms per ft is probably accurate enough.
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heinrich
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Joined: 21 February 2007 Location: Calindagan Status: Offline Points: 280 |
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Posted: 08 December 2007 at 8:25am |
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does this mean that we should delay the mid-tops (in a two way system) by approximately 4.66ms?
well assuming that we're using JBL SRX115 (bass reflex congfig) for the mid tops..... Edited by heinrich - 08 December 2007 at 8:33am |
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.....power is nothing without control....
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Jake_Fielder
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Posted: 10 December 2007 at 8:05am |
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yea, assuming you have 1850/186 folderd horns below, (and assuming the path length is 1.6meters as everyone says)
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