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  • Audax TW025A28 Testing with Waveguides

    A fine gentleman from Finland ordered a set of these and had them sent to me for some waveguide testing after mentioning them from Jeff B's thread.
    http://www.madisoundspeakerstore.com...-dome-tweeter/

    They have a small surround which made it nice for me to get in close to the dome which really helps out on the top end.

    This is in my 165mm x 115mm guide using a 1" throat. It is 1 3/8" deep.



    This is with the face plate removed. You can see how small the surround is. I think this is a great advantage when fitting the guide over the surround.




    They are advertised with a 94 db sensitivity but I think they are closer to 92 dbs from some comparisons I made against a few other tweeters I know well. Other then that they do really well in the waveguides I've tested so far. Distortion test look like they would be good down to about 1.6 kHz.

    10" x 14" Flat Baffle 0-90 degrees



    Distortion on the flat baffle.





    This is the 165mm x 115mm Elliptical guide 0-90 degrees horizontal axis





    Same 165mm x 115mm guide EQ'd flat 0-90 degrees Horizontal



    This is Flat baffle (red) vs 165mm x 115mm guide (black) on axis





    This is my 8" round guide with a 1" throat. It is 2" deep.




    I'm going to test these in a larger Elliptical guide (8x5) and see how they do. I'm thinking about trying these out with the B&C 8NDL51 8" in a sealed two way with the 8" x 5" or 6.5" x 4.5" Elliptical guides.
    http://www.parts-express.com/pe/show...number=294-649

    Not sure on the woofer though yet.

    Dave
    Last edited by davepellegrene; 10-29-2013, 05:28 AM.
    http://www.pellegreneacoustics.com/

    Trench Seam Method for MDF
    https://picasaweb.google.com/101632266659473725850

  • #2
    Re: Audax TW025A28 Testing with Waveguides

    I ran across these will looking at the Pro woofers. I've not heard of them but they look pretty nice.
    http://www.parts-express.com/pe/show...number=294-828


    Dave
    http://www.pellegreneacoustics.com/

    Trench Seam Method for MDF
    https://picasaweb.google.com/101632266659473725850

    Comment


    • #3
      Re: Audax TW025A28 Testing with Waveguides

      Originally posted by davepellegrene View Post
      I ran across these will looking at the Pro woofers. I've not heard of them but they look pretty nice.
      http://www.parts-express.com/pe/show...number=294-828


      Dave
      I've looked at those many a time....

      Jealous,
      Wolf
      "Wolf, you shall now be known as "King of the Zip ties." -Pete00t
      "Wolf and speakers equivalent to Picasso and 'Blue'" -dantheman
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      • #4
        Re: Audax TW025A28 Testing with Waveguides

        listened to them in the pbn liberty speaker and they are very good tweeters.
        craigk

        " Voicing is often the term used for band aids to cover for initial design/planning errors " - Pallas

        Comment


        • #5
          Re: Audax TW025A28 Testing with Waveguides

          Originally posted by Wolf View Post
          I've looked at those many a time....

          Jealous,
          Wolf
          Your thoughts?

          Dave
          http://www.pellegreneacoustics.com/

          Trench Seam Method for MDF
          https://picasaweb.google.com/101632266659473725850

          Comment


          • #6
            Re: Audax TW025A28 Testing with Waveguides

            Originally posted by davepellegrene View Post
            A fine gentleman from Finland ordered a set of these and had them sent to me for some waveguide testing after mentioning them from Jeff B's thread.

            They have a small surround which made it nice for me to get in close to the dome which really helps out on the top end.

            This is in my 165mm x 115mm guide using a 1" throat. It is 1 3/8" deep.



            This is with the face plate removed. You can see how small the surround is. I think this is a great advantage when fitting the guide over the surround.




            They are advertised with a 94 db sensitivity but I think they are closer to 92 dbs from some comparisons I made against a few other tweeters I know well. Other then that they do really well in the waveguides I've tested so far. Distortion test look like they would be good down to about 1.6 kHz.

            10" x 14" Flat Baffle 0-90 degrees



            Distortion on the flat baffle.





            This is the 165mm x 115mm Elliptical guide 0-90 degrees horizontal axis





            Same 165mm x 115mm guide EQ'd flat 0-90 degrees Horizontal



            This is Flat baffle (red) vs 165mm x 115mm guide (black) on axis





            This is my 8" round guide with a 1" throat. It is 2" deep.




            I'm going to test these in a larger Elliptical guide (8x5) and see how they do. I'm thinking about trying these out with the B&C 8NDL51 8" in a sealed two way with the 8" x 5" or 6.5" x 4.5" Elliptical guides.
            http://www.parts-express.com/pe/show...number=294-649

            Not sure on the woofer though yet.

            Dave
            Dave do you have any Idea how low these could cross without a waveguide?

            Comment


            • #7
              Re: Audax TW025A28 Testing with Waveguides

              Originally posted by craigk View Post
              listened to them in the pbn liberty speaker and they are very good tweeters.
              Good to hear.

              Dave
              http://www.pellegreneacoustics.com/

              Trench Seam Method for MDF
              https://picasaweb.google.com/101632266659473725850

              Comment


              • #8
                Re: Audax TW025A28 Testing with Waveguides

                Originally posted by Squidspeak View Post
                Dave do you have any Idea how low these could cross without a waveguide?

                F(s) are at 1153 Hz.

                Dave
                http://www.pellegreneacoustics.com/

                Trench Seam Method for MDF
                https://picasaweb.google.com/101632266659473725850

                Comment


                • #9
                  Re: Audax TW025A28 Testing with Waveguides

                  Here are the results for the 8x5 Elliptical guide. It measures 1-3/4" deep with a 1" throat.

                  I'm getting about 2 dbs gain on the bottom end over the 6.5" x 4.5 guide.



                  EQ'd flat and rolled off on the bottom end until distortion was flat at 92 dbs. So I would say this is the usable FR in this guide.



                  This is the distortion plot with the EQ'd graph from above.




                  Dave
                  http://www.pellegreneacoustics.com/

                  Trench Seam Method for MDF
                  https://picasaweb.google.com/101632266659473725850

                  Comment


                  • #10
                    Re: Audax TW025A28 Testing with Waveguides

                    I don't seem to remember seeing any DIY projects using Audax tweeters. At least not any recent projects. Are they not a good value or something? The one you are testing is about twice the cost of an RS28a/f. How would you say they perform compared to the RS tweeters?
                    Craig

                    I drive way too fast to worry about cholesterol.

                    Comment


                    • #11
                      Re: Audax TW025A28 Testing with Waveguides

                      Originally posted by PWR RYD View Post
                      I don't seem to remember seeing any DIY projects using Audax tweeters. At least not any recent projects. Are they not a good value or something? The one you are testing is about twice the cost of an RS28a/f. How would you say they perform compared to the RS tweeters?
                      Good Question. I haven't seen or heard one either. Good reason to try them out. I was interested in them for their hi sensitivity. Then testing them in guides they did really well.

                      Here is a comparison between the RS28F(red) in an 8x4 waveguide and The Audax(black) in the 8x5 waveguide.The RS did not do well in the 8x5 so I don't have a direct comparison. I was able to get boost up to about 10 kHz with the RS28F but then it dropped off pretty quickly. Probably because of the 1-1/8" dome. The Audax is about 5 dbs higher in sensitivity and holds it all the way out. So flattening both drivers from about 12kHz down to their XO point the Audax would stay 5 dbs more sensitive. It also has better controlled directivity. Looking around the 2 kHz area you can see the Audax is 5 dbs higher in sensitivity but is reduced at 60 degrees off axis by about 8dbs as the RS28 is only about 5dbs. So in other words from 2 - 12 kHz the Audax holds a flatter FR at each off axis measurement. The RS28F will cross lower so that is an advantage. I'm assuming this is due to the larger dome which gives up a little on the top end. So is the Audax worth the extra money. Guess that's up to the end user. I haven't' heard the Audax so I couldn't tell you.



                      Dave
                      Last edited by davepellegrene; 10-28-2013, 10:36 PM.
                      http://www.pellegreneacoustics.com/

                      Trench Seam Method for MDF
                      https://picasaweb.google.com/101632266659473725850

                      Comment


                      • #12
                        Re: Audax TW025A28 Testing with Waveguides

                        Dave,

                        Just curious what you're using to EQ the response above in order to obtain such a flat response?

                        Thank you...

                        Comment


                        • #13
                          Re: Audax TW025A28 Testing with Waveguides

                          Mini DSP taking measurements from 1 meter gated at 5ms.

                          Dave

                          Originally posted by foxfire3 View Post
                          Dave,

                          Just curious what you're using to EQ the response above in order to obtain such a flat response?

                          Thank you...
                          http://www.pellegreneacoustics.com/

                          Trench Seam Method for MDF
                          https://picasaweb.google.com/101632266659473725850

                          Comment


                          • #14
                            Re: Audax TW025A28 Testing with Waveguides

                            Very interesting Dave. I have a pair of the TW025A18 that I've never done anything with. The dome and surround dimensions and likely the same. I'll try to pull these out and test them
                            audioheuristics isn't around right now...

                            Comment


                            • #15
                              Re: Audax TW025A28 Testing with Waveguides

                              TW025's are amazing tweeters. The issue is you cannot cross them below 1K. They need a high-ish x-over point. It is a sad side effect of not being the flavor of the month.
                              .

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