Back seat Passenger conversation

It would be really nice if you were a back seat passenger trying to have a conversation with the front seat passengers to be able to hear what the front seat passengers were saying without them speaking very loud or the back seat passenger having to lean forward to try and stay in the conversation. So my idea would be to have an optional mic system in the front seat passenger compartment that the driver could turn on and off and have the conversation come over the radio speakers so all can hear and be involved in the conversation.
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