>>Since typical amplifier (stand-alone) has input impedance of 10kohm the output will be "only" 4Vrms. >>> Would You explain this in detail. I thought that 2Vrms input is quite enough for every power amp even with 10kohm input impedance. I couldn't made sence with this. Thanks

Ok. Thank You. You convinced me of that. But that's too bad for the signal adding second amp in the path even better headphone amplifier as modding. It would be nice if the pot is only attenuator. Who needs 8v rms?

Hi, Are you sure that? Do you have some ZERODAC schematics proving that? I think it's only attenuated via the same pot, switchable by relays.  Thank You!

Hi,