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Here is the next more accurate and less abstract version of the new amps input section. The different functioning resistors are not equated to a common denominator bit it is how it will be build initially, during the calibration and testing and I do not know exactly how mach I would need to attenuate the channels.

I do not see any problem in this design besides that the filter in the HF channel is loaded against a 24-stap stepped attenuator (1dB per step).  The attenuator is 30K but sine it is constant impedance laden-type it has with each step two pair of resistors switching. So, the realty it does not maintain flat 30K but fluctuates with each step from 29.96K to 3.01K. This would bring a very-very minute drifting of crossover point and consequential sliding of time-alignment in the tweeter. I acknowledge that it will be VERY small, perhaps negligibly small - only theoretical, but I do not know at this point if it will be auditable. If it will be then I would move the attenuator on the left and load the filter to a fix divider. 

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