Topologies adapted to
  symmetric filtering characteristics

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• 6 poles
• 2 Trans. zeros
  
• 4 Trans. zeros
  

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• 8 poles
• 4 Trans. zeros
  
• 6 Trans. zeros
• 6 Trans. zeros Bis
• 3d-Box filters
• 6 Trans. zeros: Type12-45
• 6 Trans. zeros: Type25-67
• 6 Trans. zeros: Type25-34 (also 2d)

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• 10 poles
• 4 Trans. zeros
  
• 6 Trans. zeros
• 8 Trans. zeros
• 8 Trans. zeros Bis
• 8 Trans. zeros BisBis (acess in the center)

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• 12 poles
• 6 Trans. zeros
  
• 8 Trans. zeros
• 10 Trans. zeros
• 10 Trans. zeros Bis

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• 14 poles
• 6 Trans. zeros
  
• 8 Trans. zeros
  
• 10 Trans. zeros
  
• 12 Trans. zeros
  
• 12 Trans. zeros Bis
  

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• 16 poles
• 8 Trans. zeros
  
• 10 Trans. zeros
  
• 12 Trans. zeros
  
• 14 Trans. zeros
  
• 14 Trans. zeros Bis
  

See topolgies adapted to Asymmetric characteristics.