Amp+ PSU


I've just received my Amp+ and before doing anything stupid, I'd have some questions :

I've this PSU laying around (http://eu.coolermaster.com/fr/mobile/mobile-power/na90/) which is 19V / 4,74A as I'm not really familiar with this technical value, I'd rather ask if it'd work with the Amp+ or if it's too much ?

If it's too powerful, what kind of feature should I look for when buying a dedicated PSU ?

If I add a power off switch, should I add it near the outlet or between the PSU & Pi. Is there any risk powering off the system / amp suddenly ?

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