Xovers and speakers: mount apart from eachother?

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  • NoDestiny
    Member
    • Jan 2009
    • 97

    Xovers and speakers: mount apart from eachother?

    Im getting ready to slap my Xovers in my boxes and something I had never thought about... do you want to keep the Xovers at a specific distance or orientation from the speakers, due to the inductors and voice coil? (similar to what was found here... http://www.troelsgravesen.dk/coils.htm)

    Thanx!
  • Face
    Senior Member
    • Mar 2007
    • 995

    #2
    I've spoken to Fredrik at Duelund about this and was advised that x-over components should be at least a few inches away from driver magnets.
    SEOS 12/AE TD10M Front Stage in Progress

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    • Evil Twin
      Super Senior Member
      • Nov 2004
      • 1531

      #3
      I would second that- while I do create some tightly packed boxes at times, like the NatalieP, the crossovers are located as far as possible from the power structures of the drivers- six inches or more if possible.
      DFAL
      Dark Force Acoustic Labs

      A wholly owned subsidiary of Palpatine Heavy Industries

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      • NoDestiny
        Member
        • Jan 2009
        • 97

        #4
        Sounds good, looks like ill have to modify my design a touch... thanx!

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        • NoDestiny
          Member
          • Jan 2009
          • 97

          #5
          One other question... closer to tweeter than woofer when given the option, I would assume?

          Comment

          • Face
            Senior Member
            • Mar 2007
            • 995

            #6
            What driver has the smaller magnet?
            SEOS 12/AE TD10M Front Stage in Progress

            Comment

            • NoDestiny
              Member
              • Jan 2009
              • 97

              #7
              Originally posted by Face
              What driver has the smaller magnet?
              Thats far too logical...

              Comment

              • Speedskater
                Junior Member
                • Mar 2009
                • 6

                #8
                Doug Self the amplifier designer, has written that one of the best things about bi-amp & bi-wire ideas is that it allows the cross-over components to be spread-out. Cross-talk from the inductors is a bigger problem than many realize.

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                • NoDestiny
                  Member
                  • Jan 2009
                  • 97

                  #9
                  Originally posted by Speedskater
                  Doug Self the amplifier designer, has written that one of the best things about bi-amp & bi-wire ideas is that it allows the cross-over components to be spread-out. Cross-talk from the inductors is a bigger problem than many realize.
                  On this latest build, I did seperate out the tweeter and woofer Xovers and got them about 6" further apart... plus made sure orientation was optimized

                  Comment

                  • JonP
                    Senior Member
                    • Apr 2006
                    • 690

                    #10
                    I had wondered a while back about driver magnet/frame proximity to crossover inductors, and did some experiments with a lab LCR meter I'm lucky enough to have handy at work.

                    Long story short... any Ferrous metal (iron, most steels, anything a magnet will stick to) getting close enough to an air core inductor will raise it's inductance, but more than 1.5-2" away had a very minimal influence.

                    Magnet or non magnet made no difference. Getting something inside the center of the core had the largest influence, then something flat to the windings of the core, and even less effect when off the edge. If you picture how the magnetic field will go thru and around the core, you can predict how much of the field might go into the metal object and change the inductance.

                    I was a bit surprised that at 2" away in any orientation, there was pretty much no effect, I thought maybe a bit farther would be needed. Good to know, for those smaller box builds!

                    Comment

                    • ---k---
                      Ultra Senior Member
                      • Nov 2005
                      • 5202

                      #11
                      This thread looks like a good place to ask. I was looking at Troel's site again. I notice that he has added caps next to inductors. But, I'm a little confused:

                      Obbligato cap in copper tube: Reduction in inductance when placed directly in the electromagnetic field of the coil.
                      The measured value is supposed to be 3.97. So, almost a 4% change. Not huge, but that is substantial. But, I'm very confused by the statement, "in copper tube." He also has pics with a cap in an "aluminum tube". Is Troel doing something funky where he puts his caps in copper and aluminum tubes? I was just surprised that there wasn't a 'regular' cap tested.

                      I'm not planing on building new speakers for a while. I always wonder if I'm getting the last bit of performance out mine. Some things that nag me are whether I'm getting a reduction in my inductors due to the spacing between the mid and woofer:



                      And now I worry about the caps:



                      I guess it isn't a big enough worry to make me test it out yet. It is on my list of todos... just if there wasn't so many movies and music.
                      - Ryan

                      CJD Ochocinco! ND140/BC25SC06 MTM & TM
                      CJD Khanspires - A Dayton RS28/RS150/RS225 WMTMW
                      CJD Khancenter - A Dayton RS28/RS150/RS180 WTMW Center

                      Comment

                      • Face
                        Senior Member
                        • Mar 2007
                        • 995

                        #12
                        Originally posted by ---k---
                        This thread looks like a good place to ask. I was looking at Troel's site again. I notice that he has added caps next to inductors. But, I'm a little confused:



                        The measured value is supposed to be 3.97. So, almost a 4% change. Not huge, but that is substantial. But, I'm very confused by the statement, "in copper tube." He also has pics with a cap in an "aluminum tube". Is Troel doing something funky where he puts his caps in copper and aluminum tubes? I was just surprised that there wasn't a 'regular' cap tested.
                        Thanks for that link, I didn't know he updated his page.

                        That's how Obbligato caps come, in copper tubes. Aluminum caps are much more common.
                        SEOS 12/AE TD10M Front Stage in Progress

                        Comment

                        • numberoneoppa
                          Senior Member
                          • Sep 2009
                          • 535

                          #13
                          Ooooh, thanks for the info, guys.
                          -Josh

                          That feeling when things are finally going right. Yeah, that one.

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