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When the frequency is less than expected.
Human hearing is most effective in the range of about 20 Hz to 20,000 Hz. Slightly lower frequency sounds may be heard or "felt." Some sounds outside this range can be heard by some individuals. Some animals have a wider range of hearing, such as dogs who can hear higher pitched (higher frequency) sounds.
watt rating of a speaker is max power it can handle without getting damaged. it will produce proportionate amount of sound for less power from amp., even for 1 watt.The power output ratings for most amplifiers are very misleading. That number,i.e.,1000 watt , is under one certain type of condition for 1 second. Usually the frequency of 1khz for 1 second. The true output under actual operating conditions 20hz-20Khz is probably closer to 100 actual watts of music power or sound reproduction power. The same with the speaker rating,,,the power rated is at the same conditions Max power @ certain frequency @ certain amount of time.Safest bet,,,,,always use a larger rated speaker for an amplifier. If you have a 200 watt amp,,,use a speaker rated a minimum of 200 watts,,,,400 is better.
The sensitivity of the human ear ranges from 20 Hz to 20 kHz. Under ideal conditions in a laboratory, humans have detected sounds as low as 12 Hz.
Why power generated with under frequency is harmful to the load?Read more: Why_power_generated_with_under_frequency_is_harmful_to_the_load
Deviation ratio: In a frequency modulation system, the ratio of the maximum frequency deviation of the carrier to the maximum modulating frequency of the system under specified conditions
In the first session of provincial assembly soon after election, speaker and deputy speaker are elected. This election is supervised by election commission under supervision of current speaker and deputy speaker.
The ratio of natural frequency of earth to moon can be given by the under-root of their value og 'g' as the formula for natural frequency can be write as "under root of g/delta"...
In the poem "Under the Greenwood Tree" by William Shakespeare, the speaker's attitude is carefree and romantic. The speaker celebrates the joys of love and nature, advocating for a simple and happy life.
It varies with individuals of course, but 19-21 is very common
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when the load on a certain system increases the frequency of the system falls normally. It is dangerous to operate the equipments when the frequency is lower than the normal rated frequency so shed the when the frequency falls under voltage relays are used. I hope i answered your question :)