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Da-115 + 25 Tafc/d Mtm

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  • #1

    Da-115 + 25 Tafc/d Mtm

    Ok, so here is the FR plot that I've manged to create for my little project, box will be ~10 liters vented, 2" by 6.5" port, 7"x16" baffle.

    I'm nowhere near sure that I did this right, but have a look and let me know what you think.;)

    If someone would tell me real quick how to post a screen shot from PCD, I will, to show the parts and offsets for review.



    Thanks,


    Mark
    Attached Files
    Last edited by Mark65; 04-05-2011, 05:31 PM.
    You go your way, I'll go mine. I don't care if we get there on time.

    ~Pink Floyd
    Tags: None
  • #2
    Re: Da115-8+ 25tafc/d Mtm

    Originally posted by Mark65 View Post
    Ok, so here is the FR plot that I've manged to create for my little project, box will be ~10 liters vented, 2" by 6.5" port, 7"x16" baffle.

    I'm nowhere near sure that I did this right, but have a look and let me know what you think.;)

    If someone would tell me real quick how to post a screen shot from PCD, I will, to show the parts and offsets for review.



    Thanks,


    Mark
    Just hit print screen when looking at PCD and it will capture the current desktop, which you can then paste into Paintbrush. Save it and post it.
    R = h/(2*pi*m*c) and don't you forget it! || Periodic Table as redrawn by Marshall Freerks and Ignatius Schumacher || King Crimson Radio
    Byzantium Project & Build Thread || MiniByzy Build Thread || 3 x Peerless 850439 HDS 3-way || 8" 2-way - RS28A/B&C8BG51
    95% of Climate Models Agree: The Observations Must be Wrong
    "Gravitational systems are the ashes of prior electrical systems.". - Hannes Alfven, Nobel Laureate, Plasma physicist.

    Comment

    • #3
      Re: Da-115 + 25 Tafc/d Mtm

      Okay, here they are...(thanks Pete)
      Attached Files
      You go your way, I'll go mine. I don't care if we get there on time.

      ~Pink Floyd

      Comment

      • #4
        Re: Da-115 + 25 Tafc/d Mtm

        You need to model baffle diffraction ripple and baffle step losses. Unless they are flush mounted in a wall.

        Comment

        • #5
          Re: Da-115 + 25 Tafc/d Mtm

          Also don't forget to ender driver offsets, will affect phase drastically if entered incorrectly. You're screenshots don't show this part of the spreadsheet.

          It is difficult to tell from your screenshots alone that you have done anything right, besides the obvious lack of BSC included in the frequency response. All the work involved in getting the frequency response data, phase, and impedance into PCD is most important.
          I'm not deaf, I'm just not listening!

          Comment

          • #6
            Re: Da-115 + 25 Tafc/d Mtm

            Ok, here are updated shots. Hope this is better!


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

            ~Pink Floyd

            Comment

            • #7
              Re: Da-115 + 25 Tafc/d Mtm

              Originally posted by Mark65 View Post
              Ok, here are updated shots. Hope this is better!


              Mark
              Now you're cookin'!!!

              Do you mean to be so far off the vertical axis?
              R = h/(2*pi*m*c) and don't you forget it! || Periodic Table as redrawn by Marshall Freerks and Ignatius Schumacher || King Crimson Radio
              Byzantium Project & Build Thread || MiniByzy Build Thread || 3 x Peerless 850439 HDS 3-way || 8" 2-way - RS28A/B&C8BG51
              95% of Climate Models Agree: The Observations Must be Wrong
              "Gravitational systems are the ashes of prior electrical systems.". - Hannes Alfven, Nobel Laureate, Plasma physicist.

              Comment

              • #8
                Re: Da-115 + 25 Tafc/d Mtm

                I'm offsetting the tweeters an inch off centerline, is that too much? I thought I did that part right, but I wasn't entirely sure...


                Edit: changed it to 1/2 inch, that will give me more room from the baffle edge...don't know what i was thinking there...
                You go your way, I'll go mine. I don't care if we get there on time.

                ~Pink Floyd

                Comment

                • #9
                  Re: Da-115 + 25 Tafc/d Mtm

                  Looking pretty good Mark!
                  "I have not failed. I've just found 10,000 ways that won't work." Thomas A. Edison

                  Comment

                  • #10
                    Re: Da-115 + 25 Tafc/d Mtm

                    Originally posted by Mark65 View Post
                    I'm offsetting the tweeters an inch off centerline, is that too much? I thought I did that part right, but I wasn't entirely sure...


                    Edit: changed it to 1/2 inch, that will give me more room from the baffle edge...don't know what i was thinking there...
                    I mean, look at the vertical spinners. Your vertical off axis is set to 16.87 degrees.

                    R = h/(2*pi*m*c) and don't you forget it! || Periodic Table as redrawn by Marshall Freerks and Ignatius Schumacher || King Crimson Radio
                    Byzantium Project & Build Thread || MiniByzy Build Thread || 3 x Peerless 850439 HDS 3-way || 8" 2-way - RS28A/B&C8BG51
                    95% of Climate Models Agree: The Observations Must be Wrong
                    "Gravitational systems are the ashes of prior electrical systems.". - Hannes Alfven, Nobel Laureate, Plasma physicist.

                    Comment

                    • #11
                      Re: Da-115 + 25 Tafc/d Mtm

                      That's another good question, I just set the listening height and distance and the program put that in there, can I change that? Should I take those out? Do they matter?
                      You go your way, I'll go mine. I don't care if we get there on time.

                      ~Pink Floyd

                      Comment

                      • #12
                        Re: Da-115 + 25 Tafc/d Mtm

                        Originally posted by Mark65 View Post
                        That's another good question, I just set the listening height and distance and the program put that in there, can I change that? Should I take those out? Do they matter?
                        If that is the actual listening height and distance from your tweeter, then your approach is good.

                        Most designs are typically set to have the tweeter at ear height when listening. In that case, vertical off axis is set to zero. But if you're optimizing for that listening axis, then you have everything set OK.
                        R = h/(2*pi*m*c) and don't you forget it! || Periodic Table as redrawn by Marshall Freerks and Ignatius Schumacher || King Crimson Radio
                        Byzantium Project & Build Thread || MiniByzy Build Thread || 3 x Peerless 850439 HDS 3-way || 8" 2-way - RS28A/B&C8BG51
                        95% of Climate Models Agree: The Observations Must be Wrong
                        "Gravitational systems are the ashes of prior electrical systems.". - Hannes Alfven, Nobel Laureate, Plasma physicist.

                        Comment

                        • #13
                          Re: Da-115 + 25 Tafc/d Mtm

                          Ah, crap, I thought it meant off the ground!

                          Oh well, back to the drawing board!
                          You go your way, I'll go mine. I don't care if we get there on time.

                          ~Pink Floyd

                          Comment

                          • #14
                            Re: Da-115 + 25 Tafc/d Mtm

                            Originally posted by Mark65 View Post
                            Ah, crap, I thought it meant off the ground!

                            Oh well, back to the drawing board!
                            Just remember that everything you're looking at is relative to the 0,0,0 point, which is your tweeter. The vertical and horizontal controls move the mic to a position relative to the 0,0,0 point. So, set your mic distance to the listening distance, and then adjust the angle to reflect where the ear will be relative to your tweeter when listening.
                            R = h/(2*pi*m*c) and don't you forget it! || Periodic Table as redrawn by Marshall Freerks and Ignatius Schumacher || King Crimson Radio
                            Byzantium Project & Build Thread || MiniByzy Build Thread || 3 x Peerless 850439 HDS 3-way || 8" 2-way - RS28A/B&C8BG51
                            95% of Climate Models Agree: The Observations Must be Wrong
                            "Gravitational systems are the ashes of prior electrical systems.". - Hannes Alfven, Nobel Laureate, Plasma physicist.

                            Comment

                            • #15
                              Re: Da-115 + 25 Tafc/d Mtm

                              The latest, this should do it, I'd guess....but then it's me, so who knows?:D
                              Attached Files
                              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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