K&K Audio / Lundahl Transformers

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K&K Audio / Lundahl Transformers

need to add a balanced inputs

73.51.130.172

Hi,

I use a "Najda DSP" that does NOT have balanced inputs and I would like to add them as I have 25 foot cable run from source.
http://www.waf-audio.com/index.php?lang=en

I'd like to ask for advice on good way to do that.
one way I heard it can be done: buffer -> transformers
Is this a good way? is this the best way?

Thanks,
Herman Chigrin

Follow Ups:

RE: need to add a balanced inputs - KevinC 13:06:01 06/12/14 (4)
Are your sources balanced out?

Kevin Carter
K&K Audio
www.kandkaudio.com
- RE: need to add a balanced inputs - Gera 13:33:08 06/12/14 (3)
  Yes. balanced out.
  and on top of that my amp (your st-70) can be made balanced "in". But that is next step.
  Now only concerned about making the balanced to unbalanced conversion as good as possible.
  
  Herman
  - RE: need to add a balanced inputs - KevinC 17:10:11 06/12/14 (2)
    There are a range of options from the relatively inexpensive LL1591, through the LL1544A, which is the input transformer in your ST-70 mod, to the larger, but sonically similar, LL1690.
    
    Kevin Carter
    K&K Audio
    www.kandkaudio.com
    - buffer - Gera 21:20:12 06/12/14 (1)
      I see I have three transformer options. The choice of one is a secondary discussion. However, is there merit to the suggestion of having a buffer in front of the transformer?
      What does that do and is it beneficial?
      
      Herman
      - RE: buffer - KevinC 05:42:14 06/13/14 (0)
        
        In Reply to: RE: buffer posted by Gera on June 12, 2014 at 21:20:12
        
        The merit of having a buffer immediately in front of the transformer depends on the driving impedance(s) of your source(s). I would say that if your source impedance is 500ohms or less, it's probably not of much, if any, benefit. Above that the benefit increases with the source impedance.
        
        Kevin Carter
        K&K Audio
        www.kandkaudio.com

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