transformer coupled output= dc block?

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A DC coupled amplifier is sensitive to source resistance (Rs) and the output offset will change for the worse if the incorrect combination of resistances are used.

If the NFB route is also DC coupled then the low impedance of the lower leg of the NFB loop can be matched by a similar value for total Rs seen by the amp input. This total Rs includes the RF filter.
 
Not necessarily a DC leak.

Some circuit designs turn ON or OFF asymmetrically. That is the components on the positive supply have a different start-up rate than the negative supply this off-set generates the thump.

My DBX active cross-over has a nasty turn-off thump.
 
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