Good to have performance information, nice of you to share it. I wasn't sure exactly what to make of NRR, but found detailed dB info on their website. All the models are different, but even with their data I'm not sure which Party Plug numbers to compare with Music Safe Pro's "Attenuation values." "Mean Attenuation," or "Assumed Protection," or neither? And I still don't know exactly what NRR is.