Announcement

Collapse
No announcement yet.

AMT2-4 versus Neo CD 1.0

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • AMT2-4 versus Neo CD 1.0

    Looking to cross LR4 @ 4khz and wanting a bit of vertical directivity. Thoughts?
    ~Brandon

    Soma Sonus
    DriverVault

  • #2
    I used the amt2-4 in my MidNite Magics build crossed at about 3.5k. I did not measure vertical directivity but can tell you the horizontal was beyond my expectation. The z axis with the surface mounted tweeter was in the .009 range. They also well exceeded my expectations.
    https://www.facebook.com/Mosaic-Audi...7373763888294/

    Comment


    • #3
      That's encouraging. Have you used or heard the Neo CD 1.0 at all? I've used the 2.0 a number of years ago and liked it. I've heard some of the new AMT's at RMAF, Often impressive with a liveliness, but sometimes had a sort of buzz. I experienced this when designing a speaker for a friend and had to remove the screen that covered the diaphragm so the buzzing would stop.
      ~Brandon

      Soma Sonus
      DriverVault

      Comment


      • #4
        Ive heard the Neo 1 but it has been some time ago. So I would hesitate to make a direct comparison. It sounded good with no apparent issues that I can remember. No idea where it was crossed at though.

        As far as buzzing issues with the AMT, I've not heard anything of the sort and I tested mine at 90+db at 1m. With a 4th order electrical filter, they are crossed very steep. I used this filter mainly because of the phase alignment. It crossed fine with a 3rd order for a flat response. The last coil just brought in an additional level of "smoothness" to the integration between the drivers. I use an Adcom GFA555 (about 250w/ch) and they have had no issues taking power from it with the volume control over the halfway mark.
        https://www.facebook.com/Mosaic-Audi...7373763888294/

        Comment


        • #5
          I haven't measured the vertical dispersion of my cd1.0, but at listening distance the vertical off axis sounds (to me) just fine when standing. I probably spend more time listening while walking around doing things than sitting in the sweet spot. I have not heard the amt to compare it. Mine is crossed at 5k, 3rd order electrical. No buzzing on my smaller amt, sounds like it was a defect. also, I would be cautious in removing the top screen area of an amt as I believe it is part of the magnetic circuit.
          Last edited by dynamo; 11-27-2016, 01:38 PM.

          Comment


          • #6
            One of the benefits of the Neo CD1.0 is that it does have significantly better vertical dispersion than most ribbon tweeters (presumably due to its shorter ribbon length). I cannot compare it to the AMT2-4 but I've used it several times, and Paul Carmody used it in his Speedsters. In my canTiLena it was crossed at 4.8 kHz to a Morel MDM55, and my recommendation would be to not cross it below 4 kHz (which is where Carmody crossed it IIRC).
            Paul

            Comment


            • #7
              I'm actually looking for some vertical directivity. How much I don't know yet, I have to model the polars on the woofers and mids. The design criteria are very wide horizontal dispersion and *somewhat* limited vertically.
              ~Brandon

              Soma Sonus
              DriverVault

              Comment


              • #8
                Originally posted by augerpro View Post
                I'm actually looking for some vertical directivity. How much I don't know yet, I have to model the polars on the woofers and mids. The design criteria are very wide horizontal dispersion and *somewhat* limited vertically.
                Sounds like you just described the cd1.0 exactly. The ribbon is only about 1/4 to 3/8" wide so horizontal dispersion is incredible, while vertical is limited somewhat but not locked in like a ribbon several inches long would be.

                Comment


                • #9
                  In looking at factory graphs it looks like horizontally the cd1.0 at 45deg is within about 6db of 0 at 15k and 8db at 20k, where the amt is about 13db at both points. Both are good horizontally but the fountek is better. Fountek also publishes vertical measurements.

                  As a whole the amt starts rolling off sooner than the fountek as well. I'm sure the amt is nice, but I feel the cd1.0 is a good value for a true ribbon.

                  Comment


                  • #10
                    From a measurement perspective the Fountek is the better driver for your intended purpose IF you can cross that high? I'm suspecting a tightly spaced MTM with small mids is where you're headed with this?

                    Comment


                    • #11
                      Yeah very small mids. At this point it's all conceptual since I can't do any wood work atm.
                      ~Brandon

                      Soma Sonus
                      DriverVault

                      Comment


                      • #12
                        FWIW if vertical was not a of concern I'd use the AMT 2-4 for the lower distortion. I'm going from memory as I can't find my measurements...
                        John H

                        Synergy Horn, SLS-85, BMR-3L, Mini-TL, BR-2, Titan OB, B452, Udique, Vultus, Latus1, Seriatim, Aperivox,Pencil Tower

                        Comment


                        • #13
                          Is there some reason you're not considering the Dayton PTMini-6?

                          Comment


                          • #14
                            Didn't know it existed!
                            ~Brandon

                            Soma Sonus
                            DriverVault

                            Comment


                            • #15
                              Originally posted by humphreyblowdart View Post
                              Is there some reason you're not considering the Dayton PTMini-6?
                              Max x-o is in the 6K to 7K range...and really not in the same league imo
                              John H

                              Synergy Horn, SLS-85, BMR-3L, Mini-TL, BR-2, Titan OB, B452, Udique, Vultus, Latus1, Seriatim, Aperivox,Pencil Tower

                              Comment

                              Working...
                              X