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tthorsten
Registered User Joined: 22 April 2004 Location: Germany Status: Offline Points: 134 |
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Posted: 17 November 2004 at 11:51am |
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
Old Croc Joined: 25 February 2004 Location: United Kingdom Status: Offline Points: 1700 |
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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
Old Croc Joined: 18 August 2004 Location: Eastbourne Status: Offline Points: 8806 |
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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
Old Croc Joined: 18 August 2004 Location: Eastbourne Status: Offline Points: 8806 |
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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
Old Croc Joined: 01 October 2004 Location: New Zealand Status: Offline Points: 2744 |
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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
Old Croc Joined: 15 August 2004 Location: Netherlands Status: Offline Points: 1568 |
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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
Young Croc Joined: 23 August 2004 Status: Offline Points: 819 |
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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: 1568 |
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Btw. a Bl of 18,6 N/A isn't that low for a 15"
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tthorsten
Registered User Joined: 22 April 2004 Location: Germany Status: Offline Points: 134 |
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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
Old Croc Joined: 25 February 2004 Location: United Kingdom Status: Offline Points: 1700 |
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Of course, I'll just go load the van up now... Back in a jiffy... |
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loophole
Registered User Joined: 02 March 2004 Status: Offline Points: 469 |
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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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