Yeah, I hear ya. That speaker grill on those Sony's is quite strong. Maybe I will be ok. Usually the speakers don't last forever anyhow, so if they punch one out, I will punch them out and then get a new one. :-|
Those ports were very old and sun burnt, so figured cut these and try them out. Worse case, I would replace them with new one's anyhow and then relocate speakers. There are not a lot of good/safe spots. The hardtop had box speakers next to the deck lights, but they whistled like crazy when running and one kept loosening up and finally fell, so they are gone. The flush mount was much better and the sound was way better in that box. Lots more base and clear sound.
I will be looking to mount some box speakers somewhere under the helm when I can find some that sound better than those I checked out in WM so far. Gotta check out Radio Shack and Best Buy. I heard that they had some marine type box speakers.