honestly amps don´t actually exist, if you believe a big part of this community (its only a cable that connects input and output and a knob that leads to nowhere)

Jokes aside though, we look at a Headphone from two perspectives, sensitivity and driver resistance, impedance is variable between 130 and 240 Ohm and sensitivity is 246mV for 94db, which is below average.

now for variable impedance headphones you want an amp with low output impedance and that sensitivity will also benefit from an amp.

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now to adress that myth, if its loud enough you don´t need an amp, there are factors that are typically forgotten. consumer amps (including whats in your laptop) typically don´t clip, when a song is too demanding (especially concerning low frequencies) instead it just delivers less power...bass is weak.

also you would want a little bass eq with the 560s, where unfortunately those cans already show more distortion than others...having a better amp here won´t hurt.

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my last argument is that you achieve basically an end to this stupid discussion with spending 200€. the topping dx3 pro+ will drive any normal headphone perfectly, except fringe cases, like the hifiman he6. This is a 1200€ headphone though, and when you reach that point, well it wouldn´t hurt to reconsider amps as well.