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Speech intelligibility in PA

Last post 07-03-2009 11:38 PM by Islander. 22 replies.
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  • 06-08-2009 7:07 AM In reply to

    Re: Speech intelligibility in PA

    " If you put a person on stage without a mic and he shouts back at you, can you understand what he's saying?"

     

    oooo, that's a good one. Take the whole PA out of the mix and listen to see if its the room.

    Of course it doesn't take speaker placement into account, not unless you hang the 'shouter' up where the cluster is! LOL

    "She was your biggest fan, and you threw her away" - Almost Famous
  • 06-08-2009 7:12 AM In reply to

    Re: Speech intelligibility in PA

    bhendrix:

    Hi Chuck,

    The first thing we're going to work on is the rear window reflection in the sanctuary.  When we listen over headphones, the vocals are clear and understandable, so this seems to be a room issue.  The next step will be to use the KP-600s by themselves without the overhead center cluster.  I still have some work to do to get the 600's up and running.  Waiting for amps and EQ settings.

     

    Bill,

    I suspect your problems are related to the natural reverb of the room and not the signal processing.  Especially if the master mix through headphones is acceptable.  Major suspects are the brick and glass which both have low absorbtion coefficients.  Parallel walls are terrible on top of this. Your flutter echo in the ceiling area above the curtains is probably ringing.  A little wall treatment will improve the situation greatly.  You can think of foam as an open window for sound.  Once it hits the foam it does not reflect.

    For the sound mix you best speaker cluster for a reverb free mix is probably the center cluster hanging.  This is because it is more optimized for angles of the room.  If you were to trace the rays of acoustics the stage speaker being parallel to the floor would radiate to the back wall and then reflect to the front parallel wall.  The hanging speaker might project to the back wall but at a skewed angle which would then bounce to the floor and congregation.  People absorb sound well, thus it will be better in a full house.

    May I make this suggestion?  If possible mix the vocals to mono and send them through the center cluster only.  I am flying blind because I don't know the SPL mapping of each speaker cluster on the floor but the rear of the room would probably sound better with mono center only.  You can then mix the instrument to the L/R stacks.  Secondarily loud acoustic instruments could be contained in a plexiglass iso chamber. (drums are the main culpret)  This would help to avoid fader creep from sound spilling over from the stage. 

    Professor Thump
    Crank it!

    "Thump Meister" on Facebook
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  • 06-08-2009 9:16 PM In reply to

    Re: Speech intelligibility in PA

    "May I make this suggestion?  If possible mix the vocals to mono and send them through the center cluster only."

    I'm glad to see someone finally repeated what I said in the very first reply on this thread.

    Golden Ear Audiophile hit with a brick "Oww, that
    hurts! I'm bleeding!"

    Tin Ear Meter Reader hit with a brick "You can't prove
    I was hit with a brick! We need to do a double blind
    ABX test!"
  • 06-09-2009 1:15 AM In reply to

    • drewby2
    • Not Ranked
    • Joined on 05-16-2009
    • Douglas, Michigan
    • Posts 5

    Re: Speech intelligibility in PA

    What an interesting idea.  Like a home theater have a center channel for the dialog.  This would eliminate phaseing and nodes in critical areas and reduce articulation loss.  A human voice, unamplified comes from a single point.  How can we expect our hearing apparatus to figure out what this "coming from everywhere" sound means? The multipath reverberations would increase the points of origen.  This is a recipe for mud. 
    .
    In my own small church (a few years ago) we put up a central cluster with three 60 dregree dispersion enclosures.  After the original design, a sound person seperated all the enclosures of the cluster.  This put the sweet spot of each speaker on the ailse.  It increased multipath problems and decreased intelligibility.  A central cluster is ideal for the intelligibility of speech. The intelligibility of the spoken word should be the first priority of a Christian house of worship.  I prefer sound reinforcement to be transparent.  I don't like to hear a sound system.  I like to hear the voice and music.
    Andrew Paton Plummer
  • 06-09-2009 4:28 AM In reply to

    Re: Speech intelligibility in PA

     Or you could mix the vocals to mono and route them through the center cluster only. 

     

     

     

    Wink 

    "She was your biggest fan, and you threw her away" - Almost Famous
  • 06-09-2009 5:34 AM In reply to

    • drewby2
    • Not Ranked
    • Joined on 05-16-2009
    • Douglas, Michigan
    • Posts 5

    Re: Speech intelligibility in PA

    The music can stick to your ribs, The sound system should be transparent.  The definition of distortion is some charactoristic of the component that alters the signal as it passed from input to output.  It should be about the music and not about the technology. My idea is that even if the music is controlled or shaped it should appear as if it is not.

    Andrew Paton Plummer
  • 06-09-2009 7:51 AM In reply to

    Re: Speech intelligibility in PA

     Not to be taken literally, just a tongue-in-cheek artistic statement.

    Read: no thin, wimpy sound- I want sound with balls! How's that?

    "She was your biggest fan, and you threw her away" - Almost Famous
  • 07-03-2009 11:38 PM In reply to

    • Islander
    • Top 75 Contributor
    • Joined on 09-19-2006
    • Vancouver Island, BC, Canada
    • Posts 3,858

    Re: Speech intelligibility in PA

    colterphoto1:
    I don't think the KP600's are your answer. Plus I think they'd look pretty oppressive in there.


    Especially if you put some AC/DC devil horns on the top, give them some red gel bottom-lighting and cue up Hell's Bells...  Devil

    Might be a way to clear the place quickly in the event of a fire!

    Pat on the Island
    510 JubScalas + Paradigm PW-2100, powered by Yamaha MX-D1 x 2,
    EQ'd by Electro-Voice Dx38, controlled by Yamaha RX-V750,
    fed by Technics SL-1400MK2 & Yamaha DVD-S550

    6.1 Surround: above plus 2 Heresy IIs & 2 Belles
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