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Thread: ATC 100 crossover

  1. #1
    Join Date: Jan 2019

    Location: Denmark

    Posts: 44
    I'm Jesper.

    Default ATC 100 crossover

    Hi fellow Sound lovers

    Iím in the process of upgrading a set of ATC SCM 100 clones Bass & midrange are ATC, with a RSS HEIL amt-1 tweeter

    My dilemma is that the old crossover is some guys mix of ok to low quality parts, an not modeled after an original ATC 100 crossover

    Iím hopping that someone has the schematic for the ATC 100 crossover

    The one I can find online, is the Wilsom audio version
    From the pics of my ATC SCM 100 crossovers I can see that they donít match 100%
    There is a 33 Ohm resistor in my original crossover, thatís not on the wilsom filter + I donít trust the Wilsom filters values on the coils....

    Iím really hoping that there is a kind soul in here with the real values
    As Iíd like not to have to disassemble my ATCís

  2. #2
    Join Date: Jan 2019

    Location: Denmark

    Posts: 44
    I'm Jesper.

    Default

    And if there is anyone whom has some tips/tricks etc to a good crossover for the RSS HEIL 3.9 Ohm tweeter
    I’d love some help there to ��

  3. #3
    Join Date: Apr 2012

    Location: London

    Posts: 641
    I'm James.

    Default

    Why are you using an AMT and expecting the original ATC crossover to work? It won't. Good luck with your project anyway, you'll get more help on DIYAudio, and tougher questions...

    Sent from my BLA-L09 using Tapatalk

  4. #4
    Join Date: Jan 2020

    Location: South Yorkshire

    Posts: 2,246
    I'm Andre.

    Default

    Seen a picture of one of those ATC 100 crossovers, Talk about massive.

  5. #5
    Join Date: Mar 2017

    Location: Seaford UK

    Posts: 1,221
    I'm Dennis.

    Default

    Quote Originally Posted by Nordlys View Post
    Hi fellow Sound lovers

    Iím in the process of upgrading a set of ATC SCM 100 clones Bass & midrange are ATC, with a RSS HEIL amt-1 tweeter

    My dilemma is that the old crossover is some guys mix of ok to low quality parts, an not modeled after an original ATC 100 crossover

    Iím hopping that someone has the schematic for the ATC 100 crossover

    The one I can find online, is the Wilsom audio version
    From the pics of my ATC SCM 100 crossovers I can see that they donít match 100%
    There is a 33 Ohm resistor in my original crossover, thatís not on the wilsom filter + I donít trust the Wilsom filters values on the coils....

    Iím really hoping that there is a kind soul in here with the real values
    As Iíd like not to have to disassemble my ATCís
    I presume that you mean Wilmslow when you say Wilsom.

    They sold ATC kits but only with the lower spec mid, less sensitive and smaller magnet.
    I doubt that ATC would provide the circuit.

    Did you mean ESS when you wrote RSS? ie the 'Great Heil'?

    My reason for getting rid of my 100SLs was that they lacked the air of the ESS Heil, and they were my 4th pair of ATCs.

  6. #6
    Join Date: Jan 2019

    Location: Denmark

    Posts: 44
    I'm Jesper.

    Default

    Hi guys

    My interest in the ATC crossover is only the bass and mids! As I LOVE the ATC bass and mids

    The combination of ess heil and ATC is not my creation, I simply brought them as I’m A= a big kid & B= love to play with this tweeter & finally C= it was cheap enough to make sense

    I’ll have to brew a filter for the ess Heil tweeter to incorporate it to the ATC’s - in its current state, it only has a variable resister

    And yes I meant Wilmslow, sorry - and I too don’t think ATC will help me out with there crossover spec’s, my main reason for this post....
    Last edited by Nordlys; 26-03-2020 at 04:23.

  7. #7
    Join Date: Jan 2019

    Location: Denmark

    Posts: 44
    I'm Jesper.

    Default

    I’d love to post pictures

    But I have no desire to upload pictures of my gear to some service, “photo pocket” ore what ever
    All other forums, eBay etc I can simply drag and drop pictures from, say my iPad without having to save the images online
    Any way to post directly from ones devices?

    Bare with me one this one, it’s only the 2 time I need to post pictures & the first time was a while ago
    Last edited by Nordlys; Yesterday at 03:15.

  8. #8
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 5,297
    I'm Alan.

    Default

    This any good:


  9. #9
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 42,479
    I'm Geoff.

    Default

    The treble filter shown is relatively simple and offers 12 db/oct roll-in. I believe the Heil tweeter is normally used with an 18 db/oct fiter, although you are bringing it into play at higher frequencies, so could get away with it as long as huge amounts of power are not used. You can play with the resistor values to adjust output.
    "when common sense, logic and plausibility are excluded. All that remain are foolishness and lies"

  10. #10
    Join Date: Mar 2017

    Location: Seaford UK

    Posts: 1,221
    I'm Dennis.

    Default

    In my use of the heil it has an LR4 Xover at 1800 Hz, but it is used by ESS down to 800 in some models.

    It is quoted as 96dB sensitivity, but I have also been told 98dB.

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