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  • Arpeggio Write-up is done and here

    For those who were/are/might be interested in my Arpeggio project (Usher 8948A and 9950-20), here's the link for the basic write-up. Sorry it took so long to get out.


    http://files.me.com/labradork/4gvno9


    shawn
    My favorite woofer is a Labrador retriever.

  • #2
    Re: Arpeggio Write-up is done and here

    COOL... Pretty straight forward crossover. A classic 8 ohm two-way as far as values go. Only that 8 ohm resistor in the woofer leg suggests it was to contour the baffle step droop.
    Could even be just a simple zoebel... Nice pics, the only complaint I have is no pretty box with them pretty drivers on a shiny baffle...
    Now you got me to wanting to hear a pair of Usher tweeters...;)

    Comment


    • #3
      Re: Arpeggio Write-up is done and here

      pix!

      Comment


      • #4
        Re: Arpeggio Write-up is done and here

        Originally posted by lunchmoney View Post
        pix!
        The ones in the middle:



        Later,
        Wolf
        "Wolf, you shall now be known as "King of the Zip ties." -Pete00t
        "Wolf and speakers equivalent to Picasso and 'Blue'" -dantheman
        "He is a true ambassador for this forum and speaker DIY in general." -Ed Froste
        "We're all in this together, so keep your stick on the ice!" - Red Green aka Steve Smith

        *InDIYana event website*

        Photobucket pages:
        https://app.photobucket.com/u/wolf_teeth_speaker

        My blog/writeups/thoughts here at PE:
        http://techtalk.parts-express.com/blog.php?u=4102

        Comment


        • #5
          Re: Arpeggio Write-up is done and here

          Nice design, very minimalist, need to see some pics though. This kinda what I'm looking for for my next project but maybe a bit expensive at the moment.

          Do designers often start a design solely by ear? I assumed these days everyone started with simulations.

          *edit*

          Just saw the pics, very nice looking indeed.

          Comment


          • #6
            Re: Arpeggio Write-up is done and here

            Originally posted by Wolf View Post
            The ones in the middle:



            Later,
            Wolf
            Thanks for posting that for me, buddy. I'll have more pics of them on my website when time allows. Keep in mind though, what you see now are nowhere close to what I have in mind for the finished project. I just wanted to get the write-up posted for those interested in them.

            shawn
            My favorite woofer is a Labrador retriever.

            Comment


            • #7
              Re: Arpeggio Write-up is done and here

              Originally posted by shawn_a View Post
              Thanks for posting that for me, buddy. I'll have more pics of them on my website when time allows. Keep in mind though, what you see now are nowhere close to what I have in mind for the finished project. I just wanted to get the write-up posted for those interested in them.

              shawn
              Yeah, *I* know it's not the final aesthetic, but a visual always helps.
              Not a problem,
              Wolf
              "Wolf, you shall now be known as "King of the Zip ties." -Pete00t
              "Wolf and speakers equivalent to Picasso and 'Blue'" -dantheman
              "He is a true ambassador for this forum and speaker DIY in general." -Ed Froste
              "We're all in this together, so keep your stick on the ice!" - Red Green aka Steve Smith

              *InDIYana event website*

              Photobucket pages:
              https://app.photobucket.com/u/wolf_teeth_speaker

              My blog/writeups/thoughts here at PE:
              http://techtalk.parts-express.com/blog.php?u=4102

              Comment


              • #8
                Re: Arpeggio Write-up is done and here

                Originally posted by shawn_a View Post
                Thanks for posting that for me, buddy. I'll have more pics of them on my website when time allows. Keep in mind though, what you see now are nowhere close to what I have in mind for the finished project. I just wanted to get the write-up posted for those interested in them.

                shawn
                It is tough to see from the picture but it looks like the tweeter is located nearly equidistant from three sides of the baffle (left, top, right) which usually isn't the best configuration in terms of diffraction issues (it falls into the category of "Worst Case Scenario" on my page on tweeter diffraction, pic and link below...)



                http://www.rjbaudio.com/Audiofiles/t...ffraction.html


                I'll mention, however, that one of my favorite speakers (Asterion, shown below) which happened to be an early project has the tweeter similarly spaced but is 1/2" closer to the top of the baffle than the sides.

                RJB Audio Projects
                http://www.rjbaudio.com

                Comment


                • #9
                  Re: Arpeggio Write-up is done and here

                  Originally posted by romanbednarek View Post
                  It is tough to see from the picture but it looks like the tweeter is located nearly equidistant from three sides of the baffle (left, top, right) which usually isn't the best configuration in terms of diffraction issues (it falls into the category of "Worst Case Scenario" on my page on tweeter diffraction, pic and link below...)



                  http://www.rjbaudio.com/Audiofiles/t...ffraction.html
                  I postulate that Shawn voiced these positioned with little or no toe in. This would smooth the diffraction effects on the listening axis.

                  C
                  Curt's Speaker Design Works

                  "It is the mark of an educated mind to be able to entertain a thought without accepting it."
                  - Aristotle

                  Comment


                  • #10
                    Re: Arpeggio Write-up is done and here

                    Originally posted by curt_c View Post
                    I postulate that Shawn voiced these positioned with little or no toe in. This would smooth the diffraction effects on the listening axis.

                    C
                    Good point!
                    RJB Audio Projects
                    http://www.rjbaudio.com

                    Comment


                    • #11
                      Re: Arpeggio Write-up is done and here

                      The first couple of times I used the link to your writeup, I couldn't get there for some reason, but I just did a bit ago. Your writeup was not only good, but fun reading, and I think you quite nicely achieved your goals for this design. I sure do like the 8945Ps in my Marcatos and I suspect your Usher woofers sound equally good (I assumed you played then there but I can't remember how they sounded at InDIYana). Really nice job, Shawn.
                      Paul

                      Comment


                      • #12
                        Re: Arpeggio Write-up is done and here

                        Originally posted by curt_c View Post
                        I postulate that Shawn voiced these positioned with little or no toe in. This would smooth the diffraction effects on the listening axis.

                        C
                        You got it, Curt. I voiced them with no toe-in quite by accident actually. It's just the way things happened one night and I never changed the arrangement out of consideration of continuity. Still they came together well enough in my estimation.

                        shawn
                        My favorite woofer is a Labrador retriever.

                        Comment


                        • #13
                          Re: Arpeggio Write-up is done and here

                          Originally posted by romanbednarek View Post
                          It is tough to see from the picture but it looks like the tweeter is located nearly equidistant from three sides of the baffle (left, top, right) which usually isn't the best configuration in terms of diffraction issues (it falls into the category of "Worst Case Scenario" on my page on tweeter diffraction, pic and link below...)



                          http://www.rjbaudio.com/Audiofiles/t...ffraction.html


                          I'll mention, however, that one of my favorite speakers (Asterion, shown below) which happened to be an early project has the tweeter similarly spaced but is 1/2" closer to the top of the baffle than the sides.

                          Yeah, you caught my boo-boo there, Roman. I didn't plan on the tweeter being centered like it is but I fudged a number in my layout and there I was. I broke a lot of little "rules" on these, with the centered tweeter and no edge treatment on the baffle, but they came out well enough and don't seem to suffer. For it being a proof-of-concept kind of run through I just wanted to get them this far before the heavy-duty final design was executed. When I do manage to get them in the final enclosure I'm going to be interested in hearing how this crossover performs with a more "proper" enclosure.

                          shawn
                          My favorite woofer is a Labrador retriever.

                          Comment


                          • #14
                            Re: Arpeggio Write-up is done and here

                            Originally posted by Paul K. View Post
                            The first couple of times I used the link to your writeup, I couldn't get there for some reason, but I just did a bit ago. Your writeup was not only good, but fun reading, and I think you quite nicely achieved your goals for this design. I sure do like the 8945Ps in my Marcatos and I suspect your Usher woofers sound equally good (I assumed you played then there but I can't remember how they sounded at InDIYana). Really nice job, Shawn.
                            Paul
                            Hi Paul
                            Thanks for the compliments. These didn't make it to InDIYana this year but I sure wanted to have them there to compare directly with the 8945 projects. I really like the way both the 8948 and 8945 woofers perform. The 8948 is very easy to work with and I'm still considering getting a pair of the 8945P woofers to play with out of curiosity.

                            shawn
                            My favorite woofer is a Labrador retriever.

                            Comment


                            • #15
                              Re: Arpeggio Write-up is done and here

                              Originally posted by shawn_a View Post
                              Yeah, you caught my boo-boo there, Roman. I didn't plan on the tweeter being centered like it is but I fudged a number in my layout and there I was. I broke a lot of little "rules" on these, with the centered tweeter and no edge treatment on the baffle, but they came out well enough and don't seem to suffer. For it being a proof-of-concept kind of run through I just wanted to get them this far before the heavy-duty final design was executed. When I do manage to get them in the final enclosure I'm going to be interested in hearing how this crossover performs with a more "proper" enclosure.

                              shawn
                              Hey Shawn, have you or anyone else that you know of done a project with these drivers that *follows* all the rules? Edge treatment, proper placement, diffraction and xo modeling, all that jazz?

                              I'd be interested in seeing the differences in the parts count, layout, and FR curve, as well as get your impressions on the sonic differences.

                              That said, I really like your writeup, and the project as a whole. I'd love to be able to do a project with some higher end drivers like that someday...not holding my breath, though!:D

                              Good Stuff!

                              Mark
                              You go your way, I'll go mine. I don't care if we get there on time.

                              ~Pink Floyd

                              Comment

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