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Dominic,

I personally do not believe into nether non-powered preamps nor into autoformers volume controls. In my world as soon a any voltage dropper begin to drive any cable it calls trouble. A volume radiating voltage divider or transformer should be sitting right next to its load and I basically accept it as a rule.

Now we add another level of complexity – a passive filter. The subject of passive line-level filter is very complicated and it is very difficult to make any generalizations. It all will be hugely deepening form the type of the filter you intend to use, the design on the input circuit of your power amp, the topology of your power amps, type of the cables and how you plane to load them and the design of the output stage of your source that drive all this thing. Everything should be observed in its unity and the filterer should be implemented in the way that it does the less damage. Ideally, and it is perfectly achievable the filer it will not do damage at all.

“The first order discrete compnent, to a digital version”?  Perhaps, but it is not my religion.  It is fundamental facts fact that digital can not filter signal, digital can delay but no filter. A first order is a simple filter and it is always there is a place where to stick it inside of amplifiers or somewhere else…

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