Nexus 6 owners had cause to rejoice a few days ago when Android 7.1.1 finally hit the beastly phone. It sat on 7.0 for quite a bit after its younger brethren received the update. However, now it seems that the celebration has come to a slight hiccup. It appears that the Shamu is suffering from a speakerphone echo bug. Yikes.
By just taking a look through the Google forums or the AOSP Issue Tracker, you will find that a lot of other users are experiencing a nearly identical problem.
Seems like the Nexus 6 Android 7.1.1 update brought with it some speakerphone echo was written by the awesome team at Android Police.