Do you mean digital to analog converter? The Lucid does not have an analog input into its amplifier that’s easily accessible without taking the system apart, so there’s no point in having your own DAC unless you’ve got a way to bypass the system, which would involve installing your own. To my ear whatever they’re using is quite good and doesn’t need extra fuss/time/money to make it even better, but that’s just my ears. Also people should understand that Dolby Atmos is a FILM listening format designed for cinema audio, and very few music recordings were/are mixed or recorded in that format, although more things are getting remastered in that format because it helps sell gear. Honestly not much music aside from film scores is even recorded/mixed in 5.1, although plenty has been remastered in that format, but aside from the sub not much is sent discreetly to the rear channels or height channels if you’re talking Atmos, it’s usually just the reverb that’s placed back there with the sound stage primarily front left center right. Audio compression via the various streaming formats has waaaaay more effect on what you’re hearing than the number of speakers.