@The Marc, never heard ADI or any other ESS/AKM based DACs with Envy, but all DACs I have audition with Envy and I've been pairing with are very musical - something I've only heard a hint of with ESS DAC in McIntosh MHA150 and I suspect this was more of their amp than DAC itself. One very detailed and therfore could be also called analytical DAC I like but I haven't header it with Envy (but others recommend) is Mola Mola Tambaqui.
My point is that if you are after analytical sound, while Envy is detailed and great for long critical listening session IMHO, this may not be the best match for you. If you would like to have a hint of tube warmth that you may look at solid state amps that sound a bit like tube ones or you could try to add a tube buffer. AuroraSound HEADA is such solid state amp.
The question is what would you like to achieve pairing ADI with Envy?