400Hz-20KHz horn for BMS 4595 |
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MarjanM
Old Croc Joined: 10 February 2005 Location: Macedonia Status: Offline Points: 7810 |
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I am more of a practical person, not theoretical. :-)
Edited by MarjanM - 27 April 2013 at 7:22pm |
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Marjan Milosevic
MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
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Steve_B
Old Croc Joined: 29 September 2007 Status: Offline Points: 1587 |
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You can’t get away from theory. If you don’t use some form
of theory you are essentially guessing. There is nothing wrong with theories
based on past practical experience.
Putting bigger PAs in bigger venues is a crude form of
theory. A more sophisticated theory is likely to give more accurate predictions.
All modelling software is based on theory and mathematical modelling. In this case, yours seems to be that the lower frequency
response limit of horns is inversely proportional to the size. No you can’t get low frequencies out of a
small horn, but there is a bit more to it than just size. I guess it just confirms that if you have the resources to
knock out decent wooden boxes, without spurious bits of glue showing, you don’t
need to know much about how loudspeakers work to set up as a manufacturer. |
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infrasound
Old Croc Joined: 13 May 2011 Location: Brizzle Status: Offline Points: 2276 |
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If your practical results don't match the theory - you don't know enough
Everything is governed by mathematical rules - it's just how far you're prepared to go!
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MarjanM
Old Croc Joined: 10 February 2005 Location: Macedonia Status: Offline Points: 7810 |
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I guess you are not really good enough in recognizing a bit of a sarcasm a?
:-)
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Marjan Milosevic
MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
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Steve_B
Old Croc Joined: 29 September 2007 Status: Offline Points: 1587 |
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Obviously not, please explain?
We had a tutor at uni’
who always said, “if your theory doesn’t match the real world it is always the
theory that is wrong”. If your theory works, it lets you predict the outcome and
understand why certain designs work and others don’t. Today, with programs like
winisd, everyone is an expert. If you can click a mouse and cut in a straight
line, you can build a reasonable loudspeaker. |
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infrasound
Old Croc Joined: 13 May 2011 Location: Brizzle Status: Offline Points: 2276 |
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Steve, what I guess I mean is that if the theory doesn't match up with the practical, then it's generally because there is more than meets the seemingly untrained eye.
Yes, it can become ridiculously convoluted, and start involving the space time continuum - but there is an underlying mathematic model that is doing its job! Is it necessary to understand every intricate detail, no, (I think you would start to surpass Einstein quite soon) but stating that all the theory is wrong implies that underpinnings of the universe are wrong.. Anyway, think I'm getting seriously carried away here . It is much easier and more time effective to understand the fundamentals (before the theory of relativity gets involved) then use practical knowledge from there
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infrasound
Old Croc Joined: 13 May 2011 Location: Brizzle Status: Offline Points: 2276 |
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I'm useless at sarcasm anyway, there's no hope in written text !
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MarjanM
Old Croc Joined: 10 February 2005 Location: Macedonia Status: Offline Points: 7810 |
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Add the language barrier to that too :-)
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Marjan Milosevic
MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
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MarjanM
Old Croc Joined: 10 February 2005 Location: Macedonia Status: Offline Points: 7810 |
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Anyway, here is how my horn works with that particular driver.
So theory, practice, lucky guess, whatever, it works :-)
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Marjan Milosevic
MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
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Steve_B
Old Croc Joined: 29 September 2007 Status: Offline Points: 1587 |
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They are pretty much the same as far as low frequency extension is concerned. It looks like there is some evidence of resonance on yours showing as peaks at 500Hz 1Khz 1.5KHz. Looking at the higher end, the response curves look similar but the upper curve (timebomb's) looks shifted to the right (upward in frequency) compared to the lower graph.
Marjan, care to share what your horn looks like? |
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MarjanM
Old Croc Joined: 10 February 2005 Location: Macedonia Status: Offline Points: 7810 |
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Steve once it is in a presentable shape i will show it. It is still in a prototyping phase. Need a bit more work.
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Marjan Milosevic
MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
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MarjanM
Old Croc Joined: 10 February 2005 Location: Macedonia Status: Offline Points: 7810 |
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One more thing, the response is within 4db (+/- 2db) from 500Hz to about 18Khz following one central line all its way. And it is much smaller horn then the other one. It is 29x29cm square front 24cm deep 60x40 dispersion.
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Marjan Milosevic
MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
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