[sdiy] Request brain dump on balanced lines

[Ingo Debus]

Don Tillman wrote:
>    > Date: Sun, 13 Oct 2002 16:12:48 +0200
>    > From: Ingo Debus <debus at cityweb.de>
>    >    > I understand that expensive transformers sound better than cheap
>    > ones, but why do transformers in general sound better than active
>    > balancing circuits? Are there any problems with active balancing
>    > circuits,
> 
> Hell, yeah!  It's a very difficult problem to solve in a high-fidelity
> way.  You need a circuit with a balanced output, a high common mode
> output imedance and a low diffential mode output impedance.  The usual
> way involves opamps and some questionable feedback paths.

I remember we discussed this a while ago. This was the circuit of the 
SSM-2142? What are the problems there?

Ingo