It will, but only 1.75 decibels louder. The smallest change in
loudness that most people can detect is 1 decibel, so the
difference between 400 and 600 watts would be barely
noticeable.
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What are the uses of DECIBEL?
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How do you use the word decibel in a sentence?
What is decibel used for?
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The most common decibel used in guitar amps would be 95 and 100
decibels. This would usually be a 60 watt amplifier.