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Unsatisified with the Sound of My Newly Built Amigas - Options?

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  • #16
    Originally posted by Chris Roemer View Post
    1st (and easiest) is to try your tweeters "reverse polarity" (to the way you have them now).
    Beyond that, if you want them "bluer"? - (not sure about using colors to describe speaker "coloration" - Oh WAIT ! - I get it? ?) - you COULD swap the position of the tweet's L-pad resistors ... THAT should brighten up the tweeter quite a bit (like maybe +5dB? - use the 2.4n in series, and the 5n across the tweeter).
    If they're too bright (blue?), then you'll be happy somewhere in-between there.
    Great advice - I'll try both, but it will take a little time to judge results or each.

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    • #17
      Wasn't polarity mentioned in post #2? Which was met with
      I have both speakers connected in phase. I'm new at building speakers and xover's, but I know enough about wiring to ground and knowing the difference between + and -


      http://techtalk.parts-express.com/fo...khanspires-but
      http://techtalk.parts-express.com/fo...pico-neo-build
      http://techtalk.parts-express.com/fo...ensation-build

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      • #18
        Originally posted by Kornbread View Post
        Wasn't polarity mentioned in post #2? Which was met with


        Maybe audiojerry doesn't like southern cooking?? Or maybe you just didn't use colors to describe things. Next time, try color by numbers maybe? Or maybe use verbiage describe a psychedelic trip with prancing elephants?

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        • #19
          I made a couple tweaks. I replaced the 2.4 ohm resistors of the tweeter L-Pads with 5.1's that I had on hand, and I removed about 30% of the stuffing from the upper third of the cabinet,
          and magic occurred. The coloration and darkness have disappeared, and I am now smiling when I listen to the Amigas.

          It's hard to believe such small changes made such a huge difference.

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          • #20
            Originally posted by audiojerry View Post
            ...and I removed about 30% of the stuffing from the upper third of the cabinet, and magic occurred. The coloration and darkness have disappeared, and I am now smiling when I listen to the Amigas.
            Per Paul's write-up there would not be stuffing in the upper 75% of the cabinet, but rather lined with some sort of open cell foam.

            "The interior walls of the enclosure need to be lined with some sort of convoluted foam or BlackHole (honestly, I use mattress topper from Wal Mart). There is also a wad of stuffing resting in the bottom 1/4 portion of the cabinet."

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            • djg
              djg commented
              Editing a comment
              Reading instructions and following plans, what a concept.

            • speedle
              speedle commented
              Editing a comment
              At the rate you all are going, no one (besides you) will ever build another speaker again.

          • #21
            Originally posted by a4eaudio View Post

            Per Paul's write-up there would not be stuffing in the upper 75% of the cabinet, but rather lined with some sort of open cell foam.

            "The interior walls of the enclosure need to be lined with some sort of convoluted foam or BlackHole (honestly, I use mattress topper from Wal Mart). There is also a wad of stuffing resting in the bottom 1/4 portion of the cabinet."
            Yes, I used 1/2" acoustic insulation on both sides and back of cabinet, and a loose application of polyester stuffing in the bottom 2 thirds. I did lots of testing with varying amounts of stuffing by temporalily attaching the front panel without the drivers and shouting into the woofer opening and listening for the cabinet to honk back at me. I wanted to put in just enough to stop the honk. (There is no scientific method for doing this that I know of) In the end I removed the stuffing from the driver compartment (the space above the last window brace). That along with changing the R2 from 2.4 to 5.1 did the trick. I am now thrilled with the sound quality.

            Any members living near Brookfield Wisconsin is welcome to listen to the results (when Covid immune)

            I appreciate everyone's advice and suggetions and enjoy the snarks too.

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            • speedle
              speedle commented
              Editing a comment
              " (There is no scientific method for doing this that I know of) "
              Actually, there is.

          • #22
            You will see the effects of both lining and stuffing in SPL charts, waterfall charts and impedance sweeps. Some modeling software will show it, but only if you know the airflow resistivity of the material used.
            www.billfitzmaurice.com
            www.billfitzmaurice.info/forum

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            • #23
              Originally posted by billfitzmaurice View Post
              You will see the effects of both lining and stuffing in SPL charts, waterfall charts and impedance sweeps. Some modeling software will show it, but only if you know the airflow resistivity of the material used.
              requiring equipment I don't have, would not know how to use, and would not know how to interpret the results. All I have to go on at my level of inexperience is how it sounds to my ears.

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