"Relevant noise?"
It reduces sound by 25-50db-depending on the model and personal choices-especially in the lower frequency ranges. You can hear what you need to hear, no problem, like sirens and horns.
They are considered safety equipment by experienced motorcyclists because by reducing the vibrations going through your ears and brain, a rider can "feel" the chassis/brakes/throttle ballet much more pronounced, can concentrate vastly better without excessive wind and engine noises and are substantially less fatigued in the same time frame. The ride becomes much more serene. AND it's much easier on a high-performance machine to ride in a lower gear-higher RPM's-where the peak torque curve lives, offering greater riding control especially on a technical route, like mountain twisties. Ear plugs let me ride a technical road in 2nd-3rd gear at 5000-7500RPM...where the bike is at it's best in terms of rapid acceleration & engine braking, keeping the chassis balanced in a tight curve.
An alert rider doesn't rely on sound for safety that much. His scan and mirrors are primary inputs for threat assessment.
Most experienced riders will tell you their skills became sharply improved after adding ear plugs to their riding gear. Now, for me, it's like a seat belt: I have a difficult time climbing on a bike without them.
I'm sure earplugs would help the OP with barking dogs.
Cobraboy, i refuse to ride any vehicle without doors, but it is duly noted that you are an avid, and experienced rider, so i need your help to clear up a question which bothers me. i have never seen Dominican motorcycles with a mirror. i commented on that reality last saturday, and was told that they remove them because they are unnecessary, and more of a hindrance than a help. please educate me on this.
back to thread, sorry for the detour.