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    JBL Synthesis CEDIA 2011 Demo Evaluation

    If you really want to know how we do it, go here and watch this video. We do completely double blind listening tests of speakers every day. The results are surprisingly interesting. http://seanolive.blogspot.com/2009/01/video-on-how-we-measure-loudspeaker.html
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    JBL Synthesis CEDIA 2011 Demo Evaluation

    This graph is only the below 80 hz seat to seat variation graph, and has NO EQ or low pass filter applied yet. Just the subwoofer optimiziation Sound Feild Management. We don't normally even look at this graph except for the variation as the frequency correction is done in another seperate step...
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    JBL Synthesis CEDIA 2011 Demo Evaluation

    SFM has 3 parameters it uses on each of up to 4 outputs, (1) delay, (2) single parametric eq and (3) overall gain. For our use we never lower the overall gain so that we maintain maximum output at the expense of some seat to seat deviation. basically we give up 1 db of variation but keep 6 or 12...
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    JBL Synthesis CEDIA 2011 Demo Evaluation

    I am reposting the last picture, it looks like it got moved on my server. Gene, these are 12 octave smoothing. It just looks different because we are zoomed very far in. Here is another look. As you can see the measurement stops at 500hz.
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    JBL Synthesis CEDIA 2011 Demo Evaluation

    I agree, in even the best room +/-1db is hard to acheive, though we have done it when we built from the ground up. the CEDIA room is more typical of a regular room. The actual number for this room is about +/-2.5 db, which is still very good. I am now going to do something that no other...
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    JBL Synthesis CEDIA 2011 Demo Evaluation

    Gene, it is too bad you sat in the front row. As you state properly this was too close, for the size of the screen and speakers, but we had no choice simply due to the space left over after we had our racks in the back and the size of the seats. Also, we had to turn down the bass due to getting...
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