You should be asking how, but to answer YOUR question...
Because people made them to.
Loudspeakers bring amplified noise, going to the microphones that are amplified to bring more noise from the loudspeakers, going to the microphones that are amplified to bring more noise from the loudspeakers, going to the microphones that are amplified to bring more noise from the loudspeakers, going to the microphones that are amplified to bring more noise from the loudspeakers...
Buy a exhaust with a larger circumference, the larger the circumference, the louder the noise.
The Audio Technica wireless headset microphones don't have noise reduction, but they are all-around wonderful microphones.
the wheel bearing on the vehicle will make a roaring noise when you accelerate the faster you go the louder it gets
Microphones are connected to input devices that read the voltage from them and hence are not driven to make noise. If you connect a power source to a magnetic or crystal microphone you can get some noise but not much. The speaker is very small and not designed for produciing sound Many microphones are dynamic and use capacitance. Hence you can not drive them like a magnetic microphone. Note: you can use a speaker as a microphone.
well, words in a book dont make any noise. if you turn the page, close the book, or even throw the book at somebody, it will make noise, thus actions speak louder than words.
Please don't do it. There's enough noise pollution without your contribution.
make no noise at all and hear enemy's louder. (this is probably already answered...)
because the noise gets louder and louder and it can damage your hearing
Sound is often louder at night because there is less ambient noise and activity, allowing sound waves to travel further without interference. This can make sounds seem louder and more noticeable in the quiet of the night.
Exactly like a cricket. Except a grasshoppers noise is louder. I heard them before. I saw them in a baseball field. You know I love to play baseball. Grasshoppers make noise but we humans can yell louder than a chirp of a grasshopper. This is why a grasshoppers chirp is louder than a crickets. Because a grasshoppers voicebox is larger than a crickets. Easy to kill. We are big, and strong.
There is usually a sound chamber located close to the player. The strings run into this, and when one is plucked the air within the chamber vibrates with it, amplifying the tone. Some players put microphones in here to create a louder noise still for concert purposes.