Denon PERL PRO Owner's Manual page 31

Contents
If you're having trouble with sound quality
To get the highest sound quality from your earbuds:
Use a lossless file format, such as AIFF, WAV or FLAC.
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Use a lossless streaming service, such as Tidal.
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If you're using Spotify or a similar streaming service, use the high-quality streaming option. Ensure to check the streaming quality options in the
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platform's settings.
Check the device is not in Social Mode.
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If you're using MP3 or MP3-like files, use high-bitrate MP3, Ogg or AAC files. Or use minimum 256kbps (and preferably 320kbps) files with modern
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codecs.
Personalize your earbuds again.
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The earbuds uses sensitive microphones to personalize, so movements, outside noises and heavy breathing can affect your hearing profile.
If the touch buttons aren't working correctly
Check your earbuds touch buttons have been set-up correctly via the Denon Headphones app.
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Reset your earbuds.
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Basic part Advanced part Headphones app Troubleshooting
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Appendix