Mono vs dual mono

A true dual mono amplifier must have everything doubled and simmetrical

A dual mono amplifier and source, or a monophonic amplifier has the right and left channel separated. This will avoid electrical interferences between the channels and this improves the soundstage. 

True Balanced Circuits

A balanced connector really stands for true balanced circuit?

For a source the best kind of connection is the balanced one, but are you sure that there is a real balanced circuit behind?

AC power and transformers

The ac transformer is simply the origin of the audio quality

A low quality transformer can reduce the audio quality. You can't reach the "silence" and fill your room with the smaller details, if everything is covered by a hum noise generating transformer.

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