Earplugs

Depending on how well you set the speaker positioning and use the microphone loud spot, will depend on how much sound level you will have at the ear.

Extreme ear plugs, or earplugs that have high attenuation levels will make  it hard to hear even the best set-up, but low to average attenuation earplugs will work reasonably well if your installation and use is good. Remember that for each decibel or dB of attenuation you effectively halve the sound, so if its very good to start with you can afford to reduce it some.

We recommend that you do not use earplugs with more than 20dB attenuation as above this will be likely to cause you to want more volume, which you cannot have. Remember it is already set to the optimum level.