Thinking about subscribing to Spotify Premium. Looking to connect IPad wirelessly to stereo amp (Leema Pulse) via Apple Airport Express. Just wanted to get people's thoughts on if you think an external DAC is essential. Would something like the Rega DAC improve the quality of the Spotify premium tracks or will the internal DAC of Apple AE be sufficient. System consits of : Leema Pulse Amp Rega Saturn CD player Monitor Audio RS6 speakers.