OnePlus 5. So how do you activate the advanced audio options including USB Audio, APT-X HD and the Audio Tuner?
Audio Tuner
To activate the audio tuner go to the settings app. Scroll down to sound and vibration. Go to the last option Audio Tuner, turn on and tweak to your hearts content. This doesn’t work on Bluetooth audio.
USB Audio
To enable USB Audio so you can plug in an external DAC, go to the settings app, advanced. Half way down toggle the OTG Storage setting to on.
APT-X HD
To enable the hi res APT-X HD, go to the settings app, advanced, and right at the bottom is an option for Bluetooth Audio Codec. Tap on this and choose between APT-X, APT-X HD and SBC. SBC is the default. The photo above shows the Astell & Kern XB10 Bluetooth Adapter that outputs the APT-X HD. You can read my review of the Astell & Kern XB10 by clicking HERE.
Dual Bluetooth
So how do you connect to two Bluetooth devices at the same time on the Oneplus 5. You have to wait for Android O update to arrive on the Oneplus 5. It is not possible yet.
If you have any questions on the Oneplus 5 don’t hesitate to ask.
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Gavin's Gadgets & Photography 
Wow One Plus has Aptx HD! I’m sure other reviewers have not mentioned this.
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It will have dual Bluetooth like the S8 with android o too.
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How does it sound Gavin – the 3T had a decent amp from memory and sounds pretty good to my ears – how is the 5?
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Slightly better actually. Does 32bit audio.
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Using one plus 5…Audio tuner is not working….even I tried by connecting and disconnecting the ear phones. Guide me the further techniques to get work
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What headphones are you trying to connect to it ?
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The music is constantly jerking on the Sony WH-1000XM2 with APTX-HD but the APTX works. And if you change codec in the Sony app, you get a problem with the pairing. It seems generally that OP 5 and Bluetooth feel cheap.
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That’s not good. OnePlus need to update their software. With 6gb ram and 835 there is no e excuses for this not to work properly
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