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Thread: Horn system pictures

  1. #151

  2. #152
    Senior Member pos's Avatar
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    And that giant horn also serves as a diffusor, neat!!

    Another interesting implementation, with a bass horn under a stage:
    http://www.diyaudio.com/forums/showt...27#post1649627

  3. #153
    Senior Member Eaulive's Avatar
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    Quote Originally Posted by jbl_man_uk View Post
    Try http://www.precisiondevices.co.uk/home.asp these are made in UK,and are used in Turbosound concert PA rigs and alike.they list both 21" and 24" drivers.
    I have the tendancy of not taking seriously anybody who talks about Watts RMS

  4. #154
    Senior Member timc's Avatar
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    What is wrong with watts RMS?
    2213 + 2435HPL w/aquaplas + H9800 (Matsj edition)

  5. #155
    Senior Member Eaulive's Avatar
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    Quote Originally Posted by timc View Post
    What is wrong with watts RMS?
    Really nothing, since it's something that doesn't exist

  6. #156
    Senior Member Hoerninger's Avatar
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    Quote Originally Posted by Eaulive View Post
    ... not taking seriously anybody who talks about Watts RMS

    At least they have PDFs with TSP.
    They are cooking with water.
    ___________
    Peter

  7. #157
    Senior Member timc's Avatar
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    Quote Originally Posted by Eaulive View Post
    Really nothing, since it's something that doesn't exist
    Doesn't exist? You have lost me.

    I thought it was a term used to describe the equivalent DC power for an AC signal.
    2213 + 2435HPL w/aquaplas + H9800 (Matsj edition)

  8. #158
    Senior Member Eaulive's Avatar
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    Quote Originally Posted by timc View Post
    Doesn't exist? You have lost me.

    I thought it was a term used to describe the equivalent DC power for an AC signal.
    No, that's average power, or W avg.
    The root mean square value of power is completely meaningless, every serious manufacturer knows this and will never rate an amplifier or speaker using WRMS.

    http://www.hifi-writer.com/he/misc/rmspower.htm
    http://en.wikipedia.org/wiki/RMS_power
    More technical:
    http://www.eznec.com/Amateur/RMS_Power.pdf

    Of course, this term is rooted so deep in the common vernacular that it's hard to get of it

  9. #159
    Senior Member timc's Avatar
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    Quote Originally Posted by Eaulive View Post
    No, that's average power, or W avg.
    The root mean square value of power is completely meaningless, every serious manufacturer knows this and will never rate an amplifier or speaker using WRMS.

    http://www.hifi-writer.com/he/misc/rmspower.htm
    http://en.wikipedia.org/wiki/RMS_power
    More technical:
    http://www.eznec.com/Amateur/RMS_Power.pdf

    Of course, this term is rooted so deep in the common vernacular that it's hard to get of it
    I see your point. But I still do think it makes sence as a "common" word. Not sure if that is the right term. If you say average power, it is not immidiate apparant that you are talking about the power of the RMS voltage.

    If you just say average power, it could mean different things. It could mean the equivalent DC power, or the avereage over a certain time.

    But academically you are quite correct, and I was "in error". It will not happen again. I promiss
    2213 + 2435HPL w/aquaplas + H9800 (Matsj edition)

  10. #160
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    ummmmm......average value is the average of the sine wave. RMS is the equivalent to DC power. 100watts RMS is the same as 100 watts at DC! It is the value that is used to calculate current and such and allows us to used ohms law to work things out. Although it doesnt exist per se, it is impotant.

  11. #161
    Senior Member Eaulive's Avatar
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    Quote Originally Posted by timc View Post
    I see your point. But I still do think it makes sence as a "common" word. Not sure if that is the right term. If you say average power, it is not immidiate apparant that you are talking about the power of the RMS voltage.

    If you just say average power, it could mean different things. It could mean the equivalent DC power, or the avereage over a certain time.

    But academically you are quite correct, and I was "in error". It will not happen again. I promiss
    No error from your part and I agree with you on one point, it's a common word and people agree on its meaning even if it's not the right word to use for that meaning.

    And I'm not bashing the individuals, especially the less knowledgeable for the use of the term, but rather the manufacturers and people in this field of activity. They should know better.

    However I still think we should try to make the effort of using the more accurate "average power" for the sake of education and to stop perpetuating a misnomer, after all it's one of the goals of this forum, share the knowledge

  12. #162
    Senior Member Eaulive's Avatar
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    Quote Originally Posted by Allanvh5150 View Post
    ummmmm......average value is the average of the sine wave. RMS is the equivalent to DC power. 100watts RMS is the same as 100 watts at DC! It is the value that is used to calculate current and such and allows us to used ohms law to work things out. Although it doesnt exist per se, it is impotant.
    100watts RMS is the same as 100 watts at DC

    No! 100W average is the same as 100W of DC.
    Re-read this article:
    http://www.eznec.com/Amateur/RMS_Power.pdf

    The RMS value of the power is meaningless and useless

    What is important to know is that the RMS value of the voltage of a sine wave going through a load is used to determine the heating power.

    In easy terms,
    7.07V peak (5VRMS) through a load of 10 ohms is 2.5Wavg
    5VDC through the same load is also 2.5W
    However if you take 7.07V peak into 10 ohms it gives 5W peak, but the RMS value of this 5W is 3.53WRMS, not the 2.5W of heating power.

    The RMS value of sine wave power is NOT the power of the RMS Voltage into a given load. It's meaningless

  13. #163
    Senior Member Woofer's Avatar
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    Quote Originally Posted by Eaulive View Post
    100watts RMS is the same as 100 watts at DC

    No! 100W average is the same as 100W of DC.
    Re-read this article:
    http://www.eznec.com/Amateur/RMS_Power.pdf

    The RMS value of the power is meaningless and useless

    What is important to know is that the RMS value of the voltage of a sine wave going through a load is used to determine the heating power.

    In easy terms,
    7.07V peak (5VRMS) through a load of 10 ohms is 2.5Wavg
    5VDC through the same load is also 2.5W
    However if you take 7.07V peak into 10 ohms it gives 5W peak, but the RMS value of this 5W is 3.53WRMS, not the 2.5W of heating power.

    The RMS value of sine wave power is NOT the power of the RMS Voltage into a given load. It's meaningless
    What should we be saying then?
    How should the power handling of a speaker be expressed?

    This is one of those tricky ones, just like dB when used to state SPL.
    If I remember correctly, I think Phons is the correct terminology for loudness, isn't it?
    Correct me or shoot me if I'm wrong....
    I might be deaf, but I can still hear da bells! (Quasimodo)
    .... Oh, and the Kick Drum.

  14. #164
    Senior Member timc's Avatar
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    dBSPL is clearly defined, and should not be confused with intensity.

    Power handling of a speakers should just be watts. Continous and peak.


    -Tim
    2213 + 2435HPL w/aquaplas + H9800 (Matsj edition)

  15. #165
    Member jack_bouska's Avatar
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    Mcintosh & Jbl Everest room By: subsoniq, posted on microsoft photosynth

    ok - back to the links with pictures of horns, this time some JBL to drool over

    http://photosynth.net/view.aspx?cid=...1-d5ee78fe573b

    3D view of dealer showroom auto-comosited courtesy Microsoft and someone with the tag: subsoniq
    2x: JBL 2269h, Altec 3182, JBL 1401nd, JBL 2123, JBL 2441, TAD2002, 6-way DCX2496 xover, 8kW. for info, google: Jack Bouska

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