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  • ATC SCM 40 v2 Passive Tri-Wire Connection "Linking Bars"

    Dear all, have a nice day.

    I have a simple question, regarding my passive SCM 40 v2:

    What is your opinion about the metal linking bars which are connecting the tri-wire connectors at the back of speaker's cabin?
    In my opinion their quality is too low, and their thickness is almost one millimeter!

    Is it better to remove them and replace them by short speakers cable (without bananas or spades, just plain wire)?

    And if yes, what would be cable's crossing section?

    ATC suggests that the speaker cable must be "good quality speaker cable with a 2.5mm minimum cross sectional area per conductor (79 strand).

    Should I use 2.5mm cable for these little "jumpers" cable or it doesn't matter?

    Thanks in advance,

    Manos, Athens, Greece.



  • #2
    Best thing you can use is this tool.
    https://www.audio-markt.de/market/ph...r-paar-1641180
    Otherwise let it like it is.
    Last edited by fr.jazbec; 07-22-2020, 11:13 AM.

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    • #3
      For my old 50s, I used a stripped copper single core cable threaded through all +- terminals. But it's better to use bi- or tri -wiring connection from the same cable.
      The standard jumpers of 40 and 50 did not suit me at all.

      Comment


      • #4
        Finally, i replaced these cheap linking bars with VDH D352 Hybrid short cables, same as main cable.

        Not an easy job, cause the wire is too thick.


        Last edited by marba1065; 07-22-2020, 07:25 PM.

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        • #5
          Originally posted by marba1065 View Post
          Finally, i replaced these cheap linking bars with VDH D352 Hybrid short cables, same as main cable.

          Not an easy job, cause the wire is too thick.

          Unfortunately, I cannot upload a photo! (Why???)
          Please see here on how to attach images into your post.

          https://www.atcforums.com/forum/anno...to-forum-posts

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          • #6
            Originally posted by Garfield View Post

            Please see here on how to attach images into your post.

            https://www.atcforums.com/forum/anno...to-forum-posts
            Not possible to upload photo, can you help?
            Here is the link:

            https://imgur.com/gallery/tXJ7KsE

            Comment


            • Garfield
              Garfield commented
              Editing a comment
              You seem to be copying the link to the image post you need to copy the link for the image itself so the file name will end in .jpg you will be able to find this in the imugr control panel.

          • #7
            I have heard that it might make sense to put the positive cable at the positiv bass input, and the ground (negativ) cable at the negative hightone input at the speakers. But I have no chance to test it because my speaker ( SCM20/SCM10) are older ones with one "terminal ".
            Maybe it is also worth a try next to the change to cables.

            Comment


            • #8
              I have found connecting to the centre set of terminals is better than the bottom and top with positive to bass and negative to top treble connection on my SCM 40s. The bass seemed to disappear with that method.

              Comment


              • #9
                I’ve done similar to the above. My links are made of Van Damme 4mm Hifi series OFC, made by eBay seller lsvcables. If you look on ATCs website, you’ll find some reviews by Martin Colloms in a Hifi Critic magazine reprinted for download. In his test of the 50 passives he found that the metal fastening was not ideal and measured unwanted resistance.
                Last edited by Nopiano; 07-26-2020, 03:40 PM.

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                • #10
                  I emailed the ATC factory as to whether it mattered which set of posts to put the main cables in and Richard Newman (R&D manager) replied that it shouldn't make any sonic difference as the terminals are interlinked.
                  I am getting some Chord Signature jumpers so it will be interesting to see if there is any sonic improvement over the factory metal linking bars.

                  Comment


                  • #11
                    If you want to really get rid of this dilemma i think the best way to go is replace one pair of terminals with quality ones and solder all the wires to it.
                    But for sure many will be disappointed from the wires that they will find inside. Cant say if rewiring the speakers is good idea, but the stock cables looks pretty ordinary for 3k£ spekers.

                    Comment


                    • #12

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                      • #13
                        My Chord signature ohmic jumper cables. I connected them to the tweeter link and they definitely are an improvement. Cymbals are much clearer and distinct. Sibilance seems to be reduced as well. I haven't had along listen as yet.

                        Comment


                        • #14
                          My second set of Chord signature ohmic links have been added. I managed to squeese them in but there is not much room to work with with the passive 40's. The Chord ohmic spades are little too long. The sound is a definite improvement overall with better image, more lifelike. I think it has been money well spent.

                          Comment


                          • #15
                            Originally posted by outfaced View Post
                            But for sure many will be disappointed from the wires that they will find inside. Cant say if rewiring the speakers is good idea, but the stock cables looks pretty ordinary for 3k£ spekers.
                            Do you know if ATC say what cables they use internally? I know one manufacturers who says they internally the runs are so short it’s not really an issue. From a traditional view of resistance R, I guess it isn’t?

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