A:AnswerThe quality of Yamaha has changed a bit..remember back in the days material and components were more resistant. Think Humidity won't be an issue as long as the opening are not cover up so hot air can go out. Just protect it by the rain.
A:AnswerPlug tv source hdmi cable into hdmi 2 on yamaha. Plug hdmi cable from yamaha hdmi output to your TV hdmi ARC input. Your television has settings to turn on the ARC feature.