Ping on line 2

Good evening, everyone,

For some time now, I've been seeing ads with ligne 2 "perfect ping". I imagine it must be very loud.

My question is: how can you tell without hearing them, and what does it actually change internally?

All the new Line 2s are "perfect ping » ?

I recently bought a new Line 2 in a store, and it's very loud, which is why I'm asking this question

Thank you to those who take the time to respond to me