• "with my active tri-amping ambitions" ... - andyr 21:37:33 08/03/14 (6)
  In Reply to: RE: Well done, Scottson - the Maggie family to the rescue. ... posted by Scottson on August 03, 2014 at 21:09:17

  Absoloootely NP, Scottson.

  However, you may be interested to know I am about to move away from active tri-amping ... to still having 6 amp channels but (taking Davey's advice! :-)) ) putting a cap in front of the ribbon to provide protection when my amp is switched on. It has never made a 'thump' when switching on but a few months ago, I happened to see the ribbon convulse when the amp came on ... so I'm thinking this can't be much good! :-))

  
  Regards,

  Andy
  

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  Edits: 08/03/14

  • RE: "with my active tri-amping ambitions" ... - Davey 21:45:58 08/03/14 (5)
    In Reply to: RE: "with my active tri-amping ambitions" ... posted by andyr on August 03, 2014 at 21:37:33

    A capacitor won't necessarily stop that convulsing. Larger value capacitors can still allow significant deflection of the tweeter when charging/discharging on transients.
    Keep your eye on it to evaluate even after the capacitor is installed.

    Cheers,

    Dave.
    

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    Edits: 08/03/14

    • "A capacitor won't necessarily stop that convulsion" ... - andyr 23:35:04 08/03/14 (4)
      In Reply to: RE: "with my active tri-amping ambitions" ... posted by Davey on August 03, 2014 at 21:45:58

      Really? I thought you said it would stop the DC-offset pulse (which my amp designer says occurs on start-up) from getting to the ribbon?
      
      
      Regards,
      
      Andy
      

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      • RE: "A capacitor won't necessarily stop that convulsion" ... - Davey 10:03:18 08/04/14 (3)
        In Reply to: RE: "A capacitor won't necessarily stop that convulsion" ... posted by andyr on August 03, 2014 at 23:35:04

        It will stop steady-state DC, but it will not prevent (all) current flow when the capacitor is charging/discharging during amplifier on/off transitions. Some amplifiers are very well-behaved in this instance but others (yours?) are not.
        
        It's probably better if you use a smaller value (vice a large one) capacitor for this purpose that provides one of the poles of your filter function.
        
        Dave.
        

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        • Yeah that's what I'm doing, Davey ... - andyr 13:10:26 08/04/14 (2)
          In Reply to: RE: "A capacitor won't necessarily stop that convulsion" ... posted by Davey on August 04, 2014 at 10:03:18

          2 x 6.8uF caps in series with the 2ohm ribbon, to provide a 6dB slope.
          
          
          Regards,
          
          Andy
          

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          • RE: Yeah that's what I'm doing, Davey ... - Davey 14:39:50 08/04/14 (1)
            In Reply to: RE: Yeah that's what I'm doing, Davey ... posted by andyr on August 04, 2014 at 13:10:26

            And? It's successful and you get no "convulsing" with that combination?
            
            Dave.
            

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            • And? It's successful and you get no "convulsing"? ... - andyr 14:42:20 08/04/14 (0)
              In Reply to: RE: Yeah that's what I'm doing, Davey ... posted by Davey on August 04, 2014 at 14:39:50

              Haven't done it yet, Davey! :-)) I'll report back in a couple of months. :-))
              
              Andy
              

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