Which digital input to use? Technics SU-R1000 or Technics SL-G700

Get it right George......the AD 5572 is a A/D converter.....not a D/A converter. There is no D/A converter (DAC) in any Technics...they are pure digital amps.....pcm to pwm conversion done directly by software.

The A/D converter is used to turn the analog signals into PCM signals......then the software turns it into PWM....unless the input is digital......the it is pure PCM to PWM.....and no A/D is needed.

You are correct, it being a adc not dac my mistake.

But I’ll hold firm in that

Even the 6 x digital inputs can be accessed as analog from the "rec out rca’s"
So it can be used as a stand alone dac also.

You don’t get it. The amp is a digital amp. It takes digital signals and converts them to analog via a pcm to pwm converter (pure digital with class D PWM output stage)......this is not a DAC in the normal sense of the word.

Now there might be a cheap DAC chip in there to convert the digital inputs to analog to feed the record out rca jacks.....but that DAC chip *if such a thing exists" would have nothing to do with the amp section.   And if there is a DAC in there to do this......why the heck would you care.  You are buying this to hear a digital amp......not to use as a DAC.  It already does what a DAC does.  If you want a great DAC....the there are tons of other options.