ExcelArray Measurement Posted

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  • Dennis H
    Ultra Senior Member
    • Aug 2002
    • 3791

    ExcelArray Measurement Posted

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    Brad posted a curve for his Seas/Newform line array. It was measured with a TacT from the listening position. The white line is the curve before EQ and the green line is his target for after EQ. Looks pretty dang good to me until you get down around 200Hz and the room effects kick in. The TacT should have no trouble fixing the minor room stuff. The speakers aren't toed in so the ribbon is (guessing) maybe 20 degrees off axis. The 20K rolloff isn't bad at all. I'm liking the looks of those Newform ribbons more and more.
  • PMazz
    Senior Member
    • May 2001
    • 861

    #2
    Pretty tough to tell with that scale. Each division is 10 dB!

    Do the Newforms suffer from the 5K resonance?

    Pete
    Birth of a Media Center

    Comment

    • Dennis H
      Ultra Senior Member
      • Aug 2002
      • 3791

      #3
      Do the Newforms suffer from the 5K resonance?
      Nope.

      Comment

      • ThomasW
        Moderator Emeritus
        • Aug 2000
        • 10934

        #4








        theAudioWorx
        Klone-Audio

        IB subwoofer FAQ page


        "Complicated equipment and light reflectors and various other items of hardware are enough, to my mind, to prevent the birdie from coming out." ...... Henri Cartier-Bresson

        Comment

        • Dennis H
          Ultra Senior Member
          • Aug 2002
          • 3791

          #5
          I think the curves on the Newform site were taken at 1 meter while Brad's were taken at about 11 feet. The FR is probably smoother farther away. Brad mentioned the bass response as well. Rick's "factory" spec is quasi anechoic but it's a fairly low Q sealed box so, the way Brad has them positioned, he's getting room/boundary gain to make them pretty flat down to 20. He's still crossing to a sub for the low stuff most of the time. I think he has the TacT set up so he can toggle the sub/XO on and off.

          Comment

          • ThomasW
            Moderator Emeritus
            • Aug 2000
            • 10934

            #6
            2m away according to text on the LMS plot

            Here's a B&G 1m plot, notch filter is installed


            R45 for comparison





            theAudioWorx
            Klone-Audio

            IB subwoofer FAQ page


            "Complicated equipment and light reflectors and various other items of hardware are enough, to my mind, to prevent the birdie from coming out." ...... Henri Cartier-Bresson

            Comment

            • Dennis H
              Ultra Senior Member
              • Aug 2002
              • 3791

              #7
              Actually, looking at the curves you just posted side by side, they aren't all that different other than the scale. Both are slightly elevated from 1K to 3K, a slight hump at 10K and down about 5dB at 20K. I would have expected Brad's to be rolled off more at 20K as he's measuring off axis but the factory measurement with the mic closer than the length of the ribbon probably rolls off the highs some too so they end up about the same.

              Edit: oops 2m.

              Comment

              • Dennis H
                Ultra Senior Member
                • Aug 2002
                • 3791

                #8
                The thing I really like about the Newform is the off-axis HF response. The bottom 3 on this 30" chart are 0, 30 and 60 degrees with a 5.5 cap. The cap looks too small to me - rolls off the LF a little too high.

                Comment

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