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Headphones: How are different types of headphones are made or designed?

Big question. I will try to make a short answer. .1 Heapdhones are made to a perceived market demand Always remember, every technical product on the market is a compromise between different ...
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How do I make my songs sound more clear?

It is definitely better to cut than to add when EQ'ing. If the mix sounds "boxy", try cutting around 250 Hz. The "mud" is in the range 300-500 Hz.
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How much many dB will a room be?

The sound power density i.e. intensity, which could be measured as watts per squaremeter, is for one machine 10^8 i.e. 100 million times as much as the hearing treshold intensity. That's what 80dB ...
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How much many dB will a room be?

The formula for this would be 10*log10(10^(dB1/10) + 10^(dB2/10) + 10^(dB3/10) etc…) So in your case having 15 noise sources at 80dB each would come out to about 91.8dB You can also use this dB ...
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Why is Compression and Expansion of Signal to Noise Ratio used in Wireless System signal transmission?

Because with a 50dB SNR the noise (white noise also known as hiss, and radio interference) would be quite noticable, especially during periods of silence or if the audio signal is not at maximum level....
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