Some help with the Denon PMA-480r pls

So i got me some Beyerdynamics DT 990 Pro and got the Denon PMA-480r out of the basement (got them from my father), cause i didn’t want to buy an additional amp. It’s working overall, but the Trebble/Bass/Balance regulators seem like they aren’t doing anything, i switched the input from aux to tuner input, didn’t change anything and i didnt manage to find the manual …

You want to make sure the source direct button is off, having it on will disable the tone controls

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