The idea of this Vivo X1 is that BBK wants to take audio very seriously on its new flagship phone, which is why it's been given a Cirrus Logic CS4398 digital-analog converter plus a CS8422 sample-rate converter -- a combo that's seemingly popular amongst Hi-Fi connoisseurs and manufacturers.
It boasts a 5 MHz bandwidth and up to 12 MSPS (megasamples per second) sample rate, while simultaneously analyzing up to one analog and four digital signals.