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Good Hearing?
A typical person with good hearing can hear from about 20Hz to 20kHz (the audio bandwidth). A person's voice will usually range from 500Hz to 2kHz...more

The Decibel Scale
Gives an approx of human perception of loudness. This is because the human ear has a logarithmic response to changes in sound level...more
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Display Energy Certificates can also be known as:
DEC, Display Energy Certificate,
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In County B
Display Energy Certificate in Banffshire, Display Energy Certificate in Bedfordshire, Display Energy Certificate in Berkshire, Display Energy Certificate in Borders, Display Energy Certificate in Buckinghamshire,