Vibrating speaker cover - help!

Hey guys, I just bought an OP-1.
My big problem: The internal speaker. Its cover vibrates with all high frequency sounds making the sound become horrible. I know that most of the times, I gonna use headphones or external speakers, but there will be times where I just wanna fiddle around with the OP itself.

So, is this vibrating/distortion normal for all devices or should I exchange my OP?

When I hold the speaker with a finger, ot sounds so much better.

OK, I just ordered a replacement, seems to be a faulty device since also the guys at the store said the speaker shouldn’t sound that badly.