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