There are speaker fader controls at multiple locations.
If it's too bassy from the Dash radio then use the menu on your radio/infotainment system to find the "Fader" or "Tone Controls".
Or if you are referring to the built in Home Theater Surround Sound settings. Do the same, go to the Menu and the Audio settings and adjust the volume on the HTS menu settings on your TV when in DVD/Home theater mode.
It could also be a menu setting on your TV menu separate of the Home Theater but it's all a guess because we don't have enough info on the issue or your RV.
Can you tell us what model year your Grand Tour is? It would help to know what dash radio system you have. And what DVD/Home Theater system you have, etc. Also, when you hear too much bass what are you listening to - your dash radio, your TV or your Home Theater????
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2017 Winnebago Adventurer 37F
2016 Lincoln MKX Toad
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