Most states do require a muffling device on boats. Most states do have exceptions like the age of the boat, but may have to be under a decibel level or if it is a racing competition, there are other requirements for those.
A muffling device
A muffling device
A muffling device
A working toilet
The exhaust on a pleasure craft is underwater. The water muffles the engine noise.
noise produced by the ventilation system
The opposite of muffling a sound would be amplifying.
Muffling what? Muffling screams in your basement? Soundproofed walls. Muffling somebody's snoring in bed? A sturdy pillow over their face, held firmly, until subject is no longer moving or breathing noticeably.
He walked through the forest, the thick fog muffling the sound of his footsteps.
All Watercraft's are required to be registered.
it is when you can not hear anything
yes