How to Use Both Speakers to Play Media in Stereo [Galaxy S5]
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In this tutorial, I’ll be showing you how to get true stereo sound on your Galaxy S5 by using both of the phone’s speakers at full volume. This mod only works with the GS5, and it does require root, but a guide on that topic is available at the full tutorial.
The Galaxy S5 comes equipped with a rear-firing loudspeaker and a front-facing earpiece speaker. A simple cut-and-paste job involving a modded XML file will make the front-facing speaker play music at full volume, resulting in crisp, clear, stereo sound.
For more information and download links, check out the full tutorial over on Gadget Hacks using the link above.