The first thing to check is that the Volume Limit setting for that zone is not at the minimum setting. Check that the speaker wiring is not the cause by checking the connections at the Head Unit and the speakers. Also ensure that t he wires are not touching any metal part of the vessel and/or touching each other as this could cause the zone to have no audio. If it is an amplified Zone ensure all connections are correct and secure and that the amp level is not set to zero.
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