Thanks for the irony. No, the Oppo does something else as well: it plays discs. Also, its DAC certainly measures better than the one in the Chromecast Audio, and in fact it measures very well indeed.
To give some background to my post, however, it is important to note that DACs are just about the most accurate part of the audio chain, and even better than amplifiers. Hence, the likelyhood of decent ones having any appreciable sonic signature is small. If the OP wants to spend money oin beter sound, the best direction is to get better speakers (perhaps unless he has very good ones) and attend to room acoustics.
To give some background to my post, however, it is important to note that DACs are just about the most accurate part of the audio chain, and even better than amplifiers. Hence, the likelyhood of decent ones having any appreciable sonic signature is small. If the OP wants to spend money oin beter sound, the best direction is to get better speakers (perhaps unless he has very good ones) and attend to room acoustics.