Control volume with DAC or Preamp?

Just for accuracy... The DS Dac is transformer coupled. You can see it here:

https://images.app.goo.gl/oDW85e3k2MKCXJP98

Same difference cap or trany coupled, they both will roll off the bass when used together by the input impedance of the next stage if not large enough as in this graph showing it’s bass roll off already starting at 100hz!!! and becomes more severe the lower the input impedance of the poweramp becomes, a 10k Class-D which many are would have zero bass output.
https://www.stereophile.com/images/914PSDSfig04.jpg

Cheers George

If you look at the graph George posted, be sure to observe the vertical scale as it is in fractions of a dB. -0.8dB down is not bad for a transformer coupled unit. However it should be noted that output transformers need to be loaded properly for optimal response. Given that PS Audio would not know what the unit was driving, its likely the loading is internal in the unit itself. This would mean the external load of an amplifier is likely irrelevant.

From the same Stereophile review:

In each case, the audioband response has a very slight rolloff in the low bass, reaching –0.8dB at 10Hz, but is otherwise flat up to 20kHz.

 its likely the loading is internal in the unit itself. 

And that we'll never know, as it is the graph shows roll off starting at 100hz already and that's with a 100k!!! loading, Stereophile usually also give a 600ohm loading,  strangely omitted this time.

Would be nice if someone that has one and can do the measurement, to see what happens with a 10k loading as many Class-D's have.
So to those going direct with this make sure your amps input impedance is >100k other wise as the bass "could" be anemic as  ozzy found out a few posts back.

Cheers George

   

Hey UNSOUND:
I have the Audionet Pre G2 and the Max Amps.  Also the MM Tambaqui DAC.
Happy Holidays!  Ken

That audionet gear looks great. I was reading about the amps and may try replicating the independent power supply transformers for each rail in my amps too. I've already got an extra one just sitting unconnected in the power supply as is so it'll just be a little 10 minute mod. Thanks for the information!