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tthorsten 
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Joined: 22 April 2004 Location: Germany Status: Offline Points: 134 |
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 Topic: kkkPosted: 17 November 2004 at 11:51am |
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kkk Edited by tthorsten - 26 June 2012 at 8:25am |
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www.tb-audio.de LEVELchek www.levelcheck.de SPL tracking SATlive www.satlive.audio best Measurementsoftware for Live People DBlimits www.dblimits.com Isemcon EMX7510 measurment Microphon |
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Dom
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Joined: 25 February 2004 Location: United Kingdom Status: Offline Points: 1700 |
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Posted: 17 November 2004 at 7:28pm |
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Not got any measurement data saved, sorry. As for SPL, I personally don't see any real reason to know what the SPL is. It's either loud enough or its not, it either sounds good or it doesn't, anything else is just dick waving. Personally I think they are loud enough. |
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norty303
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Joined: 18 August 2004 Location: Eastbourne Status: Offline Points: 8800 |
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Posted: 17 November 2004 at 7:32pm |
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I'd still like to know tho....
*waves dick enthusistically*#
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My laser stuff: Frikkin Lasers
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norty303
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Posted: 17 November 2004 at 7:34pm |
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Actually, what the calculated extension and increase in SPL when you have multiples? Is it generally the same for all horns or is it specific depending on throat shape, etc. e.g. will 2 HD15's go 3db louder and 5hz lower than 1? How is this worked out? |
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My laser stuff: Frikkin Lasers
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tb_mike
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Joined: 01 October 2004 Location: New Zealand Status: Offline Points: 2744 |
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Posted: 18 November 2004 at 3:08am |
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Well what seems to happen is that the spl is raised by +6db,even the lows ofcourse. Eventually with enough units,you maybe getting some lows that are a more useful level. I would imagine that 8would be loud enough indoors
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mobiele eenheid
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Joined: 15 August 2004 Location: Netherlands Status: Offline Points: 1563 |
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Posted: 18 November 2004 at 11:24am |
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You will get 3dB increase by doubling the power. And 3 dB increase due to the summing of the lower frequencies. But only within the length of a quarter wavelenght If the speakers in the cabs are for instance 0.5 mtr apart, the maximum frequency that will be maximal summed, is 343/0.5/4 = 171,5 Hz. Between 171,5 and 343 Hz there will be increase aswell as decrease depending on thewavelenght of the frequencies. This is why a stack will give 6 dB per doubling of speakers, but doubling of the stacks will give only 3 dB increase (if placed around 3 mtr or more apart).
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JD01
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Joined: 23 August 2004 Status: Offline Points: 819 |
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Posted: 19 November 2004 at 12:51am |
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This rule only applies as long as the driver can push the air w/o problems. The Kappa for example has low BL and a 'not-that-stiff' cone and so it won't gain 3dB by coupling in bigger stacks if you double the number. Also, the bass range will get 'soft' instead of hard-hitting.... This is of course not a 'hard edge' process.... it's not that you have 4 and everything is fine and five will ruin every thing.... it gets worse by increasing numbers up to the point where further adding of horns won't gain anything (considered that the 'stand alone loading' of one HD15 is already high) but the size of the array (which will result in higher throw.....)
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mobiele eenheid
Old Croc
Joined: 15 August 2004 Location: Netherlands Status: Offline Points: 1563 |
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Posted: 19 November 2004 at 1:50am |
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 Can you explain that a bit more, I don't see the relation with not increasing SPL within a quarterwavelenght. I don't see what the stifness of the cone or the Bl for that matter has to do with it. And what do you call bigger stacks?
Btw. a Bl of 18,6 N/A isn't that low for a 15"
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tthorsten
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Joined: 22 April 2004 Location: Germany Status: Offline Points: 134 |
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Posted: 19 November 2004 at 2:22pm |
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kkkk Edited by tthorsten - 26 June 2012 at 8:24am |
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www.tb-audio.de LEVELchek www.levelcheck.de SPL tracking SATlive www.satlive.audio best Measurementsoftware for Live People DBlimits www.dblimits.com Isemcon EMX7510 measurment Microphon |
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Dom
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Joined: 25 February 2004 Location: United Kingdom Status: Offline Points: 1700 |
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Posted: 19 November 2004 at 6:26pm |
Of course, I'll just go load the van up now... Back in a jiffy... |
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loophole
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Posted: 19 November 2004 at 6:47pm |
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hey dom, while you're at it, do you think you could finish some cabinets for me? i only need you to make me a few labhorns, but remember to only use flint tools, i have a real thing about traditional woodworking. maybe if you bought a couple of dancestacks along as well i could have a listen to decide what i prefer.
if you do a really nice job i'll let you do the door at one of our hackney parties - i'll even let you keep any weapons you confiscate, i promise! |
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This rule only applies as long as the driver can push the air w/o problems. The Kappa for example has low BL and a 'not-that-stiff' cone and so it won't gain 3dB by coupling in bigger stacks if you double the number.