I've discovered that you can have separate equalizer settings for speaker/jack/Bluetooth headsets : r/GalaxyS9
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Top 6 Samsung Galaxy S9/S9+ Audio Settings You Should Know
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Top 6 Samsung Galaxy S9/S9+ Audio Settings You Should Know
Music Player & Equalizer- Musical for Galaxy S9 for Android - Download | Cafe Bazaar
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How to Add an Audio Equalizer to Your Galaxy's Volume Panel « Android :: Gadget Hacks
Top 6 Samsung Galaxy S9/S9+ Audio Settings You Should Know
Skin Decal Wrap for Samsung Galaxy S9 sticker Equalizer - Walmart.com - Walmart.com
Top 6 Samsung Galaxy S9/S9+ Audio Settings You Should Know
