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Old 10th August 2020
I think R30 would reduce low-mid ambient noise reflections, but if there are HVAC mechanics in the drop ceiling, that might or might not help with that issue. Also, if the ceiling tiles are reflective at the frequency of the noise then it wouldn’t be helpful.

I think that the primary acoustic purpose of ceiling tiles is to provide privacy in office spaces where partitions do not go all the way to the real ceiling.

To that end their acoustic characteristics usually concern the reflection and absorbtion of the voice range.

Can you get a sense of the frequency range of the ambient noise?

My random guess would be that you could swap half of the ceiling tiles with fiberglass and probably improve things. I’m not sure I would want to deal with a fabric ceiling in a restaurant... yuck.