How to take off protective grid on NPM5 speakers?

Hi, I have NPM5 speakers.On the one with an amplifier,protecting grid is a little bit bent.
It does not seem to touch the speakers,so I don't thik it would have any impact on sound, but I'd realy like to straighten it out.
Is there any way to take the grid off? It seems the speakers are mounted from the front side,so the grid should be mounted over it. I hope it's not glued.
Any Idea how to take the grid off and put it back later?
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