In fact, the OnePlus forums are filled with threads of people complaining the right side “speaker” isn’t working. So the OnePlus 6T may not actually have dual speakers as consumers were led to believe, but some modders have put together a way of enabling the earpiece speaker as an output. It also turns out that the OnePlus 6T speaker is actually quite powerful with the right adjustments. The stock audio tuner just leaves a lot to be desired. Thus, with a combination of a Magisk mod and an enhanced kernel that allows for deeper audio tuning, people have reported up to 100% increase in speaker volume, with no distortion. Note: This guide requires root with Magisk. See Appuals guide “How to Unlock and Root the OnePlus 6T”.
Requirements
We will begin this guide assuming you are already rooted.
Optional – Tweaking Earpiece Volume with Cleanslate Kernel
This part of the guide requires you have TWRP recovery on your OnePlus 6T. The earpiece might sound a bit weak in “dual speaker” mode. Normally, “dual speaker” mods would damage the earpiece as they are not designed for playing loud audio. They’ll often sound distorted compared to the speaker. However, it seems OnePlus used a very high-quality earpiece that is almost as beefy as the speaker in the 6T. People have reported being able to crank up the earpiece volume with no distortion by using audio adjustments in the Cleanslate kernel.
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