8 ohm CC designs?

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  • Paul Ebert
    Senior Member
    • May 2004
    • 402

    8 ohm CC designs?

    Is anyone aware of an 8 ohm CC design? I may need one for use with my HK AVR 154. The mains and surrounds will be Module MTs, so something using the Dayton RS series would be nice.

    Alternatively, could anyone suggest how I might create such a design? I've been modeling various configurations (MTM, MT/WM, etc) with various (RS) drivers, and they always seem to dip well below 5 ohms in the higher frequencies.

    I could simply use another Module MT, but I'd rather not have it be that tall.
  • Undefinition
    Senior Member
    • Dec 2006
    • 577

    #2
    Good point. If you want to keep the "sideways MTM" thing, then use two woofers in series. Should have no impedance issues there.

    There seem to be very few MTMs with the woofers wired in series (TriTrix and Tubifex are the only two that come to mind); I don't know why this is.

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    • cjd
      Ultra Senior Member
      • Dec 2004
      • 5568

      #3
      Modular uses a 4ohm or 6ohm tweeter...

      A pair of 4ohm mid-woofers would work, but horizontal mtm is not the best choice ever... I would take the extra height and a modula mt.
      diVine Sound - my DIY speaker designs at diVine Audio

      Comment

      • cjd
        Ultra Senior Member
        • Dec 2004
        • 5568

        #4
        dang phone. Fixes ohm stupidly.
        diVine Sound - my DIY speaker designs at diVine Audio

        Comment

        • Undefinition
          Senior Member
          • Dec 2006
          • 577

          #5
          Yes, but... he could do a W/TM/W setup, with the woofers in series, and still stay in the safe zone of impedance. Eh? Eh? :W
          Isn't it about time we started answering rhetorical questions?
          Paul Carmody's DIY Speaker Site

          Comment

          • Paul Ebert
            Senior Member
            • May 2004
            • 402

            #6
            Yeah, a WT/MW is my thought too. But, when I try with 4 ohm woofers (in series) and 8 ohm tweeter and mid, I get system impedances as shown on this link:

            RS180-4x2 RS52 Aura NT1 system impedance

            I can't seem to do anything with the mid and tweeter filters (or woofer, for that matter) to raise the impedance above 200 hz. Any ideas?

            Comment

            • Undefinition
              Senior Member
              • Dec 2006
              • 577

              #7
              Originally posted by Paul Ebert
              Yeah, a WT/MW is my thought too. But, when I try with 4 ohm woofers (in series) and 8 ohm tweeter and mid, I get system impedances as shown on this link:

              I can't seem to do anything with the mid and tweeter filters (or woofer, for that matter) to raise the impedance above 200 hz. Any ideas?
              Could you email me your project files? I might be able to help.
              Isn't it about time we started answering rhetorical questions?
              Paul Carmody's DIY Speaker Site

              Comment

              • cjd
                Ultra Senior Member
                • Dec 2004
                • 5568

                #8
                You're not working with 8ohm drivers above 200Hz... - so you're not going to be able to get impedance up.
                diVine Sound - my DIY speaker designs at diVine Audio

                Comment

                • Paul Ebert
                  Senior Member
                  • May 2004
                  • 402

                  #9
                  Well, the RS52 has a (rated) Re of 5.4 and the Aura NT1's Re is 6.96. Perhaps I could find drivers with higher values, but should I need to?

                  Comment

                  • Paul Ebert
                    Senior Member
                    • May 2004
                    • 402

                    #10
                    Paul, I'd be happy to email the files. Could you PM me your email address?

                    Thanks!

                    Comment

                    • cjd
                      Ultra Senior Member
                      • Dec 2004
                      • 5568

                      #11
                      Can you share the topology? Even that can give tips on what you could change.
                      diVine Sound - my DIY speaker designs at diVine Audio

                      Comment

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