I recently acquired a 7200. I hae this connected to my Outlaw 990 via 12 volt trigger. Approx 10 seconds after everything I power everything off, I hear a weird noise come out of my right front speaker. It is almost like an electronic slide down the frequency (from high to low). Can anyone tell me why this is happening? Thanks in advance
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Dedicated Theater: Outlaw 990, Outlaw 7200, Kef Q speakers, HSU sub, SVS sub, Sony Projector, Da-lite screen, Panasonic 500 BD, Panamax, Harmony 900

Bedroom: Sony 4es, Sonus Faber; Pioneer 5080; Aragon 8008X3, Marantz MA-500, Velodyne servo sub, Panasonic 55 bd; Panamax, Harmony One

Livingroom: Onkyo TX-SR602, Vizio M70-C3, Atlantic Technology 5.1, Xbox one, Xbox 360, Playstation 4