I have recently purchased a bright red Nexus 5 32GB, and found that there is a problem with mic.
I have to speak loudly or repeat my words so that the other person on call will be able to hear me.
I have gone through this thread
and found that am not the only person with this problem and users have also raised the same in this google group
Users are stating that they have RMA'd the phone but the problem still exists.
I too have done testing with sound recorder apps and they all seem to record my voice properly.
I want to find out if this problem is only in the stock ROM or does it also effect custom ROMs and custom kernels.
so, anyone using custom ROM or kernel can please check and update us if the mic is working properly in your phone, can the other person hear you clearly. can you check any voice recording app and google keep and confirm if the voice recordings are of same volume and clarity.