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New Center Channel Speaker, need help on the crossover

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  • New Center Channel Speaker, need help on the crossover

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    I am building a custom CC for the bedroom to go with Paul's Swope MTM's. I know he designed a specific CC for those but I wanted to be able to wall mount this CC directly below the TV. I am really hoping Paul will drop in and help me on this crossover due to his knowledge of the Swopes, but anyone's help will be greatly appreciated. I am still to green to tackle the crossover by myself and I'm not one of those guys that is to proud to admit it. I am studying everything I can to become more knowledgeable on this subject, but it's a lot to take in. In the mean time I hope to learn from your experience and help.

    The drivers are (4) of the Hi-Vi M4N's and the ND28F-6 Tweeter. I was hoping to follow the Overnight Sensations CC crossover type, a 2.5 way. The sealed enclosure measures 6" x 6" x 39" and is built from 1/2" MDF. The internal volume is close to .5 cubic feet. This should yield somewhere around 75hz by my calculations. The centers from the inner mids to the tweeter is 3.813, from outer mid to inner mid is 4.832. Let me know if there is any other information needed to design the crossover.

    I will post pictures of the progress as this project moves along.
    Last edited by Kevin K.; 12-31-2014, 03:14 AM.
    My "No-Name" CC Speaker
    Kerry's "Silverbacks"
    Ben's Synchaeta's for Mom
    The Archers
    Rick's "db" Desktop CBT Arrays
    The Gandalf's

  • #2
    Re: New Center Channel Speaker, need help on the crossover

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    If I did this right this should be a picture of the panels laying flat, followed by a dry fit check, and the last one is showing the removable rear panels for access to the drivers and crossover.
    My "No-Name" CC Speaker
    Kerry's "Silverbacks"
    Ben's Synchaeta's for Mom
    The Archers
    Rick's "db" Desktop CBT Arrays
    The Gandalf's

    Comment


    • #3
      Re: New Center Channel Speaker, need help on the crossover

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      First stage of the glue process, I will glue the front to the enclosure after I cut the reliefs on the back side for the drivers to breath better.
      My "No-Name" CC Speaker
      Kerry's "Silverbacks"
      Ben's Synchaeta's for Mom
      The Archers
      Rick's "db" Desktop CBT Arrays
      The Gandalf's

      Comment


      • #4
        Re: New Center Channel Speaker, need help on the crossover

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        Here is my approach on what I think you guys call rebating the baffle. I cut plastic inserts for the router bearing to guide off of. This is probably overkill, but in this case I had four holes to rebate, and I got the same result on all four holes. Not to mention if I ever do any other projects in the future that uses the M4N drivers, I have the template finished and ready to go.
        My "No-Name" CC Speaker
        Kerry's "Silverbacks"
        Ben's Synchaeta's for Mom
        The Archers
        Rick's "db" Desktop CBT Arrays
        The Gandalf's

        Comment


        • #5
          Re: New Center Channel Speaker, need help on the crossover

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          Finished glue up last night, still felt like I needed more clamps but this was all I had available. The goal today is prime and paint, I will post more pics after painting is complete.
          My "No-Name" CC Speaker
          Kerry's "Silverbacks"
          Ben's Synchaeta's for Mom
          The Archers
          Rick's "db" Desktop CBT Arrays
          The Gandalf's

          Comment


          • #6
            Re: New Center Channel Speaker, need help on the crossover

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            Primed and almost ready for paint, the weather was perfect for this today. I've never shot a urethane paint before, this will be the first time, hopefully all goes well.
            My "No-Name" CC Speaker
            Kerry's "Silverbacks"
            Ben's Synchaeta's for Mom
            The Archers
            Rick's "db" Desktop CBT Arrays
            The Gandalf's

            Comment


            • #7
              Re: New Center Channel Speaker, need help on the crossover

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              Here's a couple of photos with the drivers sitting in the cabinet loose. The paint match is not spot on, but it's pretty close. I am going to build Paul's MTM's for the lefts and rights and stay with the same paint scheme. I will post another picture of this once I have it mounted under the tv to the wall.

              No one has chimed in yet with a crossover suggestion, not sure why unless I screwed up on the driver choices and a good crossover is just not feasible. I know the M4N's get a little nasty on the upper end but I thought it could be crossed below that to avoid it. If the drivers are the problem, could someone let me know why to help me better understand.
              My "No-Name" CC Speaker
              Kerry's "Silverbacks"
              Ben's Synchaeta's for Mom
              The Archers
              Rick's "db" Desktop CBT Arrays
              The Gandalf's

              Comment


              • #8
                Re: New Center Channel Speaker, need help on the crossover

                If you can trace the frd/imp files for each and post them I should be able to give you some input by the end of the week.
                -Kerry

                www.pursuitofperfectsound.com

                Comment


                • #9
                  Re: New Center Channel Speaker, need help on the crossover

                  Originally posted by Navy Guy View Post
                  If you can trace the frd/imp files for each and post them I should be able to give you some input by the end of the week.
                  Thanks Kerry, Parts Express has the frd/imp files for the M4N's on their website, so I wont have any problem getting that to you, but I'm not sure how to come up with the same for the ND28F-6. How does one go about tracing the file to come up with the frd/imp? Do I need a measuring device? Or do you just print the manufacturers spec sheet and plot the data manually?
                  My "No-Name" CC Speaker
                  Kerry's "Silverbacks"
                  Ben's Synchaeta's for Mom
                  The Archers
                  Rick's "db" Desktop CBT Arrays
                  The Gandalf's

                  Comment


                  • #10
                    Re: New Center Channel Speaker, need help on the crossover

                    SPL Copy or SPL Trace are both free and can do it. I think trace does it mostly automatically.
                    -Kerry

                    www.pursuitofperfectsound.com

                    Comment


                    • #11
                      Re: New Center Channel Speaker, need help on the crossover

                      Originally posted by Navy Guy View Post
                      SPL Copy or SPL Trace are both free and can do it. I think trace does it mostly automatically.
                      OK, I will look into these this evening and get back to you with the information as soon as I can. Thanks in advance for the help, I was really starting to panic that no one was going to help. I know I put the cart before the horse by building the speaker without having the crossover designed. I promise I will continue my studies and eventually be able to design one for myself.
                      My "No-Name" CC Speaker
                      Kerry's "Silverbacks"
                      Ben's Synchaeta's for Mom
                      The Archers
                      Rick's "db" Desktop CBT Arrays
                      The Gandalf's

                      Comment


                      • #12
                        Re: New Center Channel Speaker, need help on the crossover

                        Here ya go.....FRD & ZMA for the ND28F-6

                        These are via SPL Trace using Dayton-supplied graphs.

                        Good luck.

                        ND28F-6.frd

                        ND28F-6.zma
                        Bryan K.

                        Midwest Audio Club

                        Speedster | Sub Attachť | The Wildeman | Sean's NLA Towers | CO‹GAR, COUGAR II and CO‹GAR JR | Triton | Lithium | J-Boom | Trym MLTL | Docere MLTL

                        Comment


                        • #13
                          Re: New Center Channel Speaker, need help on the crossover

                          Originally posted by bkeane1259 View Post
                          Here ya go.....FRD & ZMA for the ND28F-6

                          These are via SPL Trace using Dayton-supplied graphs.

                          Good luck.

                          [ATTACH]53182[/ATTACH]

                          [ATTACH]53181[/ATTACH]
                          Awesome Bryan, thanks!
                          My "No-Name" CC Speaker
                          Kerry's "Silverbacks"
                          Ben's Synchaeta's for Mom
                          The Archers
                          Rick's "db" Desktop CBT Arrays
                          The Gandalf's

                          Comment


                          • #14
                            Re: New Center Channel Speaker, need help on the crossover

                            Originally posted by Kevin K. View Post
                            [ATTACH=CONFIG]53174[/ATTACH][ATTACH=CONFIG]53175[/ATTACH]

                            Here's a couple of photos with the drivers sitting in the cabinet loose. The paint match is not spot on, but it's pretty close. I am going to build Paul's MTM's for the lefts and rights and stay with the same paint scheme. I will post another picture of this once I have it mounted under the tv to the wall.

                            No one has chimed in yet with a crossover suggestion, not sure why unless I screwed up on the driver choices and a good crossover is just not feasible. I know the M4N's get a little nasty on the upper end but I thought it could be crossed below that to avoid it. If the drivers are the problem, could someone let me know why to help me better understand.
                            Those look great.
                            How did you do the face of the baffle.

                            Comment


                            • #15
                              Re: New Center Channel Speaker, need help on the crossover

                              Originally posted by Dewmiester View Post
                              Those look great.
                              How did you do the face of the baffle.
                              Thanks Dewmiester. I went to an automotive paint supply to find the color to match the M4N's. Once the enclosure was primed I sprayed the entire front of the enclosure with that color. After that dried, I masked the stripes with some 1/4" masking tape and masked the chamfers with 3/4", then proceeded to paint the entire enclosure in the black. After that was dry, peel the masking tape and there is your result.
                              My "No-Name" CC Speaker
                              Kerry's "Silverbacks"
                              Ben's Synchaeta's for Mom
                              The Archers
                              Rick's "db" Desktop CBT Arrays
                              The Gandalf's

                              Comment

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