Since you're a Spotify fan, you might opt for running it on your 'puter instead of the phone. It allows for using a good sound card and your choice of the available programs, both freeware and purchased. You can choose from fairly sophisticated eq's, room correction with the addition of a calibrated mic, measurement routines....everything from the simple to the sublime.
And no interrupts when the phone rings....or whatever your phone does to get your attention...*G*
And no interrupts when the phone rings....or whatever your phone does to get your attention...*G*