Nexus 6P one speaker during calls.

Hi, i cant believe this isnt a thing as of yet... but im wondering if anyone knows how to activate both speakers for the nexus 6p when youre on speaker on a call because currently nexus 6p only uses one for some damn reason itd be really nice if it used both. It must be possible to make this mod? Or alter some settings to get this effect? Can someone help me out?

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