Always on Equaliser

I just tried my Priv's music playing abilities and compared them against my Passport's. It seems there's a bass favouring equaliser that's always on on the Priv. I've tried going into the sound settings of the Deezer and Google Play Music apps and turning the equalier completely off but it still seems adamant to keep it turned on.

It makes the Passport's sounds sound so clean in comparison.

I understand that Android has an OS wide equaliser which can be used by any apps that require it.

Any ideas on how to turn it off?

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