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My RS180 MTM Design

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  • Jesse055
    replied
    Re: My RS180 MTM Design

    I'm having some difficulty understanding how you came up with the inductor and capacitor values? I had made a crossover based on 4 ohm tweeter and woofer at 1700 from all the online calculators for LR 2nd orders and I came up with .75Mh and 11uf caps?

    Now I do realize the tweeter is 3 rd order so I see that is most the difference ibut those numbers still off too. I'm just not understanding how a 1.2 mh inductor with a 20uf cap crosses at 1700 hz. Hope you can explain how these values were determined

    Leave a comment:


  • Jesse055
    replied
    Re: My RS180 MTM Design

    I'm having some difficulty understanding how you came up with the inductor and capacitor values? I had made a crossover based on 4 ohm tweeter and woofer at 1700 from all the online calculators for LR 2nd orders and I came up with .75Mh and 11uf caps?

    Now I do realize the tweeter is 3 rd order so I see that is most the difference ibut those numbers still off too. I'm just not understanding how a 1.2 mh inductor with a 20uf cap crosses at 1700 hz. Hope you can explain how these values were determined

    Leave a comment:


  • Jeff B.
    replied
    Re: My RS180 MTM Design

    Originally posted by RBG View Post
    Jeff, are you planning to make some new designs using new RS paper drivers?
    Yes actually, the 180 and the RS28f are on the docket. Probably after the InDIYana gathering.

    Jeff

    Leave a comment:


  • RBG
    replied
    Re: My RS180 MTM Design

    Jeff, are you planning to make some new designs using new RS paper drivers?

    Leave a comment:


  • DannyG
    replied
    Re: My RS180 MTM Design

    Right,I look for a good build but dont like to spend more money on the x-over than the drivers.

    Leave a comment:


  • Jeff B.
    replied
    Re: My RS180 MTM Design

    Originally posted by DannyG View Post
    Jeff nice job and nice and simple x-over,I think I've seen some builds useing these same drivers but the x-overs were far more complicaded.Is there a reason for a more involed x-over?
    I have found that there are usually simpler ways to achieve the target transfer function than I often see used. It's all a matter of optimization of the network.

    Leave a comment:


  • DannyG
    replied
    Re: My RS180 MTM Design

    Jeff nice job and nice and simple x-over,I think I've seen some builds useing these same drivers but the x-overs were far more complicaded.Is there a reason for a more involed x-over?

    Leave a comment:


  • Jeff B.
    replied
    Re: My RS180 MTM Design

    Originally posted by billschulte View Post
    Jeff...any chance you could give me a crossover for the HDS Scan Speak tweeter as a substitute for the Dayton ...thanks
    It wouldn't be real accurate. I have files already, but I don't have any RS180's to work with, so I can't measure them together. If I substitute the HDS files for the RS28a files there would be some assumptions that would have to be made regarding response on the same baffle and how the sensitivities actually match up. This would make the crossover less than exact.

    Leave a comment:


  • Chris Roemer
    replied
    Re: My RS180 MTM Design

    Link, or at least a full model no.?

    Leave a comment:


  • billschulte
    replied
    Re: My RS180 MTM Design

    Jeff...any chance you could give me a crossover for the HDS Scan Speak tweeter as a substitute for the Dayton ...thanks

    Leave a comment:


  • Jeff B.
    replied
    Re: My RS180 MTM Design

    Originally posted by hoxuanduc View Post
    Mr. Bagby,

    Many thanks for sharing the elegant cross over design. The speakers sound great! Spot on tonal balance, natural, great imaging and soundstaging. On one song a bird was singing 5ft above the speakers right at the ceiling. You can hear surround effect on 2 channels (e.g. sound coming from behind you w/o processing) on Netflix.

    Duc
    Thank you for the kind comments. I am glad you are happy with them.
    Jeff

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  • hoxuanduc
    replied
    Re: My RS180 MTM Design

    Mr. Bagby,

    Many thanks for sharing the elegant cross over design. The speakers sound great! Spot on tonal balance, natural, great imaging and soundstaging. On one song a bird was singing 5ft above the speakers right at the ceiling. You can hear surround effect on 2 channels (e.g. sound coming from behind you w/o processing) on Netflix.

    Duc

    Leave a comment:


  • Wushuliu
    replied
    Re: My RS180 MTM Design

    Originally posted by Jeff B. View Post
    Stick with what sounds best to you. There really isn't much difference between 48 and 50 uf anyway. This cap is giving a little more tweeter protection and helping to shape the response at the roll-off, but the difference between these two values isn't enough to make a real difference.
    Thanks as always for the quick response.

    Leave a comment:


  • Jeff B.
    replied
    Re: My RS180 MTM Design

    Originally posted by Wushuliu View Post
    So I have the MTM up and running but one question: For the 50uf I used 2x24uf for a day until I got dug through my bin enough to scrounge up a proper 50uf (1x30uf, 2x10uf). When I swapped in the 50, the sound got kind of dull, flat compared to the 48uf. Unfortunately my DMM has 20uf max so I can't verify exact capacitance so maybe one set is way over/under. I much prefer the 48uf. What part of the xo is this affecting?

    Stick with what sounds best to you. There really isn't much difference between 48 and 50 uf anyway. This cap is giving a little more tweeter protection and helping to shape the response at the roll-off, but the difference between these two values isn't enough to make a real difference.

    Leave a comment:


  • Wushuliu
    replied
    Re: My RS180 MTM Design

    So I have the MTM up and running but one question: For the 50uf I used 2x24uf for a day until I got dug through my bin enough to scrounge up a proper 50uf (1x30uf, 2x10uf). When I swapped in the 50, the sound got kind of dull, flat compared to the 48uf. Unfortunately my DMM has 20uf max so I can't verify exact capacitance so maybe one set is way over/under. I much prefer the 48uf. What part of the xo is this affecting?

    Leave a comment:

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