Poweramp is probably the single most popular 3rd party local music player for Android out there, and if you shelled out four bucks for the privilege of using it, you might be curious to learn about a little-advertised feature in the app: automatic EQ presets. That's to say, you can tell Poweramp which EQ preset to use based on whether you're using the phone's external speaker, a wired 3.5mm cable, or Bluetooth audio.

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