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My favorite amplifier upgrade has become variable negative feedback. This function allows the amplifier to be compatible with an extraordinarily wide array of existing sound systems and tastes. As was stated earlier, synergy is very important within an audio system.
If you have encountered an impact on the sound of a circuit as a result of a construction difference between two passive components, carbon film vs metal film resistors for example,then you have made choice of which one to use based on how the circuit sounds with a particular component in it. The circuit measures the same but sounds different depending on whichresistor you use. If changes in passive components including the jacks used on the inputs and the wire connecting them to input selector switch doesn't impact the resulting sound,as a designer one is faced with a couple of interpretations of the null result. Either passive components like RCA jacks, hookup wire and selector switches have no measurable effect or impact on the sound of the circuit, or they do and can't be heard with the current circuit design or the system in which it is being evaluated. The Devil is in the details, the more transparent the circuit the more the passive components surrounding it can impact it performance irrespective of measurements. Scotty