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  • #91
    Originally posted by filmslayer View Post
    rpb , 2nd order mid and woofer and 3rd order tweet correct ? i should be able to suss it and get it laid out in Xsim . not sure if i'm gonna have all the parts on hand so we may need to tweak a bit 4.7mH for 5 and .2mh for .3 are two know already ....
    Do you have any coils near .05mH, or caps around the .1 or .2 uf range?

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    • #92
      Originally posted by rpb View Post
      Do you have any coils near .05mH, or caps around the .1 or .2 uf range?
      no , not much real small .
      Paper Towers
      RS180P/28F surrounds
      Boombox

      Comment


      • #93
        The woofer is probably 89dB, but on an infinite baffle. It looses 6dB due to baffle step. So, depending on how you measure it, the spl looks different. It's probably 89dB at 500hz, and looks lower at 100hz.

        I didn't mean to imply that you were off. There's a hundred ways to do this x-over. Mines just an initial sim. I'd need to listen and make 5 or 6 changes to get close to acceptable. There's always compromises due to cost, or impedance issues, or simply the work involved in wiring 20 to 30 parts together without making a mistake. You like the results. That's all that matters. I make so many x-overs for my speakers that I can't decide which one to make final. I have lots of parts on hand, so it costs me nothing to try different x-over points, slopes, etc. I hook it all up with jumpers on the floor near the speakers. Then I fix a drink, and evaluate the x-over for the evening. Sometimes a x-over is great with a Nora Jones tune, but not so great with Cream at higher spl. I want both if I can achieve it.

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        • #94
          Originally posted by filmslayer View Post
          no , not much real small .
          We can work around that then. Smallest coil I have is .1mH. The .1 and .2 caps come in handy.

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          • #95
            all my builds are just learning experiments . i was kinda proud of this one , it is the first that i didn't have to come outta pocket for anything , YET ! lol

            Paper Towers
            RS180P/28F surrounds
            Boombox

            Comment


            • #96
              New sim.

              woofer
              4.7mH and 40uf

              mid
              highpass 90uf cap, and 1mH shunt.
              lowpass .2mH, and 30uf shunt cap.
              padding 2 ohms before the x-over, and a 12 ohm shunt in parallel with the mids.

              tweeter
              3rd order 3uf, .2mH shunt, 8uf
              padding 5 ohms after the x-over, and 12 ohms in parallel with the tweeter.

              ​Maybe I translated that right.
              Attached Files

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              • #97
                You could combine your 2.4mH and 4.7mH to make a 7.1mH. I made a nice 350hz x-over sim using that value.

                You will need about a 90uf cap, and 2mH coil for the mid highpass. Or a 1mH, and 120uf. something in between works too. The rest stays the same. This is the x-over point that I would probably attempt if they were my speakers.

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                • #98
                  Originally posted by rpb View Post
                  New sim.

                  woofer
                  4.7mH and 40uf

                  mid
                  highpass 90uf cap, and 1mH shunt.
                  lowpass .2mH, and 30uf shunt cap.
                  padding 2 ohms before the x-over, and a 12 ohm shunt in parallel with the mids.

                  tweeter
                  3rd order 3uf, .2mH shunt, 8uf
                  padding 5 ohms after the x-over, and 12 ohms in parallel with the tweeter.

                  ​Maybe I translated that right.

                  i have all this but the two 12 ohms . not feeling to good today though , i think i drank too much last night ....
                  Paper Towers
                  RS180P/28F surrounds
                  Boombox

                  Comment


                  • #99
                    The 12 ohm resistor value can likely be changed without hurting anything. See what it looks like with xsim, and tweak the values to something you have on hand. If you eventually order parts, I think the mid lowpass could be improved a little. I'd try to push down the 10k breakup some more. If you look closely, you can see that it is affecting the summation at 10k slightly, but that's only on axis. I'm sure that the mid 10k peak drops off at 20 degrees or more, so it's likely a minor issue.

                    Maybe you could make a .05mH coil. I have some old coils that look like good wire donors, you probably do too.

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                    • Comment


                      • rpb , either your translation is wrong or the way i read it it ! ... no hurries thought i still feel like sh!t , only got outts bed a couple times to walk the dog ... Click image for larger version

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                        Paper Towers
                        RS180P/28F surrounds
                        Boombox

                        Comment


                        • The tweeter circuit is wrong. Coil in the middle shunts to ground.
                          Wolf
                          "Wolf, you shall now be known as "King of the Zip ties." -Pete00t
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                          • thanks ben .
                            Paper Towers
                            RS180P/28F surrounds
                            Boombox

                            Comment


                            • I simmed with the mids in parallel. It looks like your sim shows them in series. Hopefully, that's the problem.

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                              • Originally posted by rpb View Post
                                I simmed with the mids in parallel. It looks like your sim shows them in series. Hopefully, that's the problem.

                                that was it ,
                                Paper Towers
                                RS180P/28F surrounds
                                Boombox

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