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It’s that time audio enthusiasts! Registration for the 2019 Speaker Design Competition is now open! Visit midwestaudiofest.com for details and to list your speaker project. We are excited to see all returning participants, and look forward to meeting some new designers this year, as well! Be sure your plans include a visit to the Parts Express Tent Sale for the lowest prices of the year, and the Audio Swap Meet where you can buy and trade with other audio fans. We hope to see you this summer! Vivian and Jill
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The Chorales - An Usher / Vifa Project

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  • Re: The Chorales - An Usher / Vifa Project

    Hong, is there impedance matching built into your crossover or is it not necessary? I'm trying to piece together crossovers little by little and always thought it consisted of a resistor or two before the driver. I thought the xt25 sensitivity was higher than the Usher so it would need some sort of compensation.

    Comment


    • Re: The Chorales - An Usher / Vifa Project

      Originally posted by Deepstage View Post
      Hong, is there impedance matching built into your crossover or is it not necessary? I'm trying to piece together crossovers little by little and always thought it consisted of a resistor or two before the driver. I thought the xt25 sensitivity was higher than the Usher so it would need some sort of compensation.
      My advice to you is to strictly follow proven methods that have been established by people like Jeff B., dlr and Charlie Laub. Going on your own and "trying to piece together" a crossover is going to give you nothing but frustration. When the crossover point is optimal, FR, phase and impedance will come together with great results, but all those things start with good data. You need to have a good handle on driver measurements before you can proceed, before you can discuss impedance and sensitivity matching.

      Hong
      Some people are addicted to Vicodin. I'm addicted to speaker building.

      The Chorales - Usher 8945A/Vifa XT25TG Build
      ESP Project 101 Lateral MOSFET Amplifier
      LM4780 Parallel Chipamp
      Sonata Soundbar Project
      The Renditions - Active/Passive Towers

      Comment


      • Re: The Chorales - An Usher / Vifa Project

        Hong, would you mind sharing your crossover with me? I'm not sure what you're using for your Erse .8 I-core as they don't have one. Did you unwind the 1.0 to get the .8? Could I use an air core 0.8 inductor or is the I core one in the notch for a purpose?
        I know the dc resistance is important so I want to follow what you did.

        Also, I don't recognize some of your capacitors. I can see it looks like you doubled up a couple 20uF Dayton 250V for the 40. Can I use the same capacitors everywhere else or is there a reason for using the different brands and 600v caps elsewhere? I know I've read about using certain caps in certain situations.

        I fully understand the layout and wiring of the components and I already have some of the components. I have the resistors already and some of the inductors along with the 20uF caps.


        I think our designs are so similar, I could easily reduce my box volume to yours and try your crossovers for a starting point. If I love them, then I'm on to another build, if not, I'll have fun tinkering and learning.

        Thanks for your help!

        Paul

        PS, your inbox was full so I posted here. Hope you don't mind. PM me if you would like.

        Comment


        • Re: The Chorales - An Usher / Vifa Project

          Please see my responses below, and good luck. Make sure you post your listening impressions. Thanks.

          Originally posted by Deepstage View Post
          Hong, would you mind sharing your crossover with me? I'm not sure what you're using for your Erse .8 I-core as they don't have one. Did you unwind the 1.0 to get the .8? Could I use an air core 0.8 inductor or is the I core one in the notch for a purpose?
          I know the dc resistance is important so I want to follow what you did.

          Get the Erse 1.0mH I-Core and unwind to get 0.8mH. You may need to get a LCR meter to do this. And you're right, I didn't use an air core inductor there because of the high DCR.

          Also, I don't recognize some of your capacitors. I can see it looks like you doubled up a couple 20uF Dayton 250V for the 40. Can I use the same capacitors everywhere else or is there a reason for using the different brands and 600v caps elsewhere? I know I've read about using certain caps in certain situations.

          Yes, you can double them up to get the value you need. Or you can get this one from PE:

          http://www.parts-express.com/dayton-...citor--027-442


          I fully understand the layout and wiring of the components and I already have some of the components. I have the resistors already and some of the inductors along with the 20uF caps.


          I think our designs are so similar, I could easily reduce my box volume to yours and try your crossovers for a starting point. If I love them, then I'm on to another build, if not, I'll have fun tinkering and learning.

          Thanks for your help!

          Paul

          PS, your inbox was full so I posted here. Hope you don't mind. PM me if you would like.
          Some people are addicted to Vicodin. I'm addicted to speaker building.

          The Chorales - Usher 8945A/Vifa XT25TG Build
          ESP Project 101 Lateral MOSFET Amplifier
          LM4780 Parallel Chipamp
          Sonata Soundbar Project
          The Renditions - Active/Passive Towers

          Comment


          • Re: The Chorales - An Usher / Vifa Project

            Just a quick update. After sealing with 1/2 wood glue and 1/2 water, I gave the cabs a couple of coats of Rustoleum sandable primer, and wet-sanded with 1,200 paper. The surface came out smoother than a baby's bottom. I think they'll be ready for a paint job in the next few days.
            Attached Files
            Some people are addicted to Vicodin. I'm addicted to speaker building.

            The Chorales - Usher 8945A/Vifa XT25TG Build
            ESP Project 101 Lateral MOSFET Amplifier
            LM4780 Parallel Chipamp
            Sonata Soundbar Project
            The Renditions - Active/Passive Towers

            Comment


            • Re: The Chorales - An Usher / Vifa Project

              Hong, at 1200 grit, the paint might not stick well or could have a lot of runs. I don't usually go over 600 before top coat to prevent this
              -Kerry

              Comment


              • Re: The Chorales - An Usher / Vifa Project

                Originally posted by Navy Guy View Post
                Hong, at 1200 grit, the paint might not stick well or could have a lot of runs. I don't usually go over 600 before top coat to prevent this
                Thanks for the tip Kerry. I'm still learning the paint process. However, the Tempo boombox seems to be doing OK with the 1,200 grit sand job, but I'll redo it with 600 to be sure.
                Attached Files
                Some people are addicted to Vicodin. I'm addicted to speaker building.

                The Chorales - Usher 8945A/Vifa XT25TG Build
                ESP Project 101 Lateral MOSFET Amplifier
                LM4780 Parallel Chipamp
                Sonata Soundbar Project
                The Renditions - Active/Passive Towers

                Comment


                • Re: The Chorales - An Usher / Vifa Project

                  Wow the tempos came out very nice Hong! Let me know if you need to borrow my electric buffer since you're on a painting frenzy

                  Comment


                  • Re: The Chorales - An Usher / Vifa Project

                    Originally posted by kbzx35 View Post
                    Wow the tempos came out very nice Hong! Let me know if you need to borrow my electric buffer since you're on a painting frenzy
                    Thanks Shawn. Please drop off the electric buffer along with the SS woofers so I don't have to stop the painting frenzy.
                    Some people are addicted to Vicodin. I'm addicted to speaker building.

                    The Chorales - Usher 8945A/Vifa XT25TG Build
                    ESP Project 101 Lateral MOSFET Amplifier
                    LM4780 Parallel Chipamp
                    Sonata Soundbar Project
                    The Renditions - Active/Passive Towers

                    Comment


                    • Re: The Chorales - An Usher / Vifa Project

                      Originally posted by hongrn View Post
                      Thanks for the tip Kerry. I'm still learning the paint process. However, the Tempo boombox seems to be doing OK with the 1,200 grit sand job, but I'll redo it with 600 to be sure.
                      That looks like it turned out fine so you might not need to worry. I've personally sprayed after 800 grit and had more issues with runs on vertically oriented pieces so I top out on the primer at 600 now.
                      -Kerry

                      Comment


                      • Re: The Chorales - An Usher / Vifa Project

                        You have a good point. On a small project like the Tempo, it might not matter, but on a larger cab like the Chorales, that may be an issue. Thanks Kerry.

                        Originally posted by Navy Guy View Post
                        That looks like it turned out fine so you might not need to worry. I've personally sprayed after 800 grit and had more issues with runs on vertically oriented pieces so I top out on the primer at 600 now.
                        Some people are addicted to Vicodin. I'm addicted to speaker building.

                        The Chorales - Usher 8945A/Vifa XT25TG Build
                        ESP Project 101 Lateral MOSFET Amplifier
                        LM4780 Parallel Chipamp
                        Sonata Soundbar Project
                        The Renditions - Active/Passive Towers

                        Comment


                        • Re: The Chorales - An Usher / Vifa Project

                          Almost there. On this project, I learned how to paint, not perfectly, but to come up with a decent product using rattle cans. They ain't going to look like Steve's Candy Kairos, but from 4 feet away and after a few beers, they look perfecto. Well, another thing I tried was the 3M Dinoc. After the third panel, I finally got it. Wrapping around round corners was pretty difficult at first, but once I figured out how much heat to apply on the material, it was a joy to use. Perfect material for challenged people like me.
                          Attached Files
                          Some people are addicted to Vicodin. I'm addicted to speaker building.

                          The Chorales - Usher 8945A/Vifa XT25TG Build
                          ESP Project 101 Lateral MOSFET Amplifier
                          LM4780 Parallel Chipamp
                          Sonata Soundbar Project
                          The Renditions - Active/Passive Towers

                          Comment


                          • Re: The Chorales - An Usher / Vifa Project

                            Pretty cool look you got there.
                            Kenny

                            http://www.diy-ny.com/
                            DIY NY/NJ 2014 https://www.youtube.com/watch?v=FGwA...ature=youtu.be
                            Man does not live by measurements alone, a little music helps.

                            Comment


                            • Re: The Chorales - An Usher / Vifa Project

                              They look mighty good to me and I didn't have to drink any alcoholic beverages to determine that!
                              Paul

                              Originally posted by hongrn View Post
                              Almost there. On this project, I learned how to paint, not perfectly, but to come up with a decent product using rattle cans. They ain't going to look like Steve's Candy Kairos, but from 4 feet away and after a few beers, they look perfecto. Well, another thing I tried was the 3M Dinoc. After the third panel, I finally got it. Wrapping around round corners was pretty difficult at first, but once I figured out how much heat to apply on the material, it was a joy to use. Perfect material for challenged people like me.

                              Comment


                              • Re: The Chorales - An Usher / Vifa Project

                                Very nice! I love the way the Chorales have turned out.

                                Comment

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